8086:0046 [Gateway NV55C] Two backlight interfaces that wont adjust backlight.

[Max Oropeza]

I couldn't get the backlight to work after I upgraded to 13.04.

WORKAROUND: The only grub lines that seem to work are these:
GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"
GRUB_CMDLINE_LINUX="acpi_osi="

I tried changing the grub parameters, and after several trys, nothing. I was asked to run grep . /sys/class/backlight/*/* and got the results of:

maxo@Dayman:~$ grep . /sys/class/backlight/*/*
/sys/class/backlight/acpi_video0/actual_brightness:9
/sys/class/backlight/acpi_video0/bl_power:0
/sys/class/backlight/acpi_video0/brightness:9
grep: /sys/class/backlight/acpi_video0/device: Is a directory
/sys/class/backlight/acpi_video0/max_brightness:9
grep: /sys/class/backlight/acpi_video0/power: Is a directory
grep: /sys/class/backlight/acpi_video0/subsystem: Is a directory
/sys/class/backlight/acpi_video0/type:firmware
/sys/class/backlight/intel_backlight/actual_brightness:976
/sys/class/backlight/intel_backlight/bl_power:0
/sys/class/backlight/intel_backlight/brightness:976
grep: /sys/class/backlight/intel_backlight/device: Is a directory
/sys/class/backlight/intel_backlight/max_brightness:976
grep: /sys/class/backlight/intel_backlight/power: Is a directory
grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory
/sys/class/backlight/intel_backlight/type:raw

But using the Fn Keys, you can only adjust it a little, like from full brightness to about half. To add something else, with the other parameters when I adjust with the Fn Keys, the brightness bubble you get on the top right of your screen doesn't appear.

http://marc.info/?l=linux-acpi&m=137557874107551&w=2

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-19-generic 3.8.0-19.29 [modified: boot/vmlinuz-3.8.0-19-generic]
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: maxo 2482 F.... pulseaudio
Date: Sun Apr 28 07:01:21 2013
HibernationDevice: RESUME=UUID=f71ed279-badf-446b-afc6-d5a75316ec0a
InstallationDate: Installed on 2013-04-25 (2 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Gateway NV55C
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic root=UUID=bc22ba4b-fcd9-46f3-b10a-11477dd4f618 ro acpi_osi= acpi_backlight=vendor quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.8.0-19-generic N/A
 linux-backports-modules-3.8.0-19-generic N/A
 linux-firmware 1.106
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/10/2011
dmi.bios.vendor: Gateway
dmi.bios.version: V1.24
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: NV55C
dmi.board.vendor: Gateway
dmi.board.version: V1.24
dmi.chassis.type: 10
dmi.chassis.vendor: Gateway
dmi.chassis.version: V1.24
dmi.modalias: dmi:bvnGateway:bvrV1.24:bd08/10/2011:svnGateway:pnNV55C:pvrV1.24:rvnGateway:rnNV55C:rvrV1.24:cvnGateway:ct10:cvrV1.24:
dmi.product.name: NV55C
dmi.product.version: V1.24
dmi.sys.vendor: Gateway

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.9 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9-raring/

[Naseem (na-shamshoum)]

i confirm this bug , i have a clean ubuntu 13.04 installation on a formatted partition

[panmari (panmari)]

Also confirmed on a lenovo X1 Carbon. Checking now with upstream Kernel

[vincenz (christophe-poucet)]

Confirmed on XPS 13. When is a fix expected?

[Alexander (amenzhinsky)]

I am having same problem on ASUS N53VZ.

When GRUB_CMDLINE_LINUX="" HUD worrks fine but I can change brigthtness only by one division in the end of the line
When GRUB_CMDLINE_LINUX="acpi_osi=" controls work fine, but HUD doesn't appear and sound effect doesn't play
When GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor" nothing works

$ uname -r
3.8.0-21-generic

[KyleWhittington (kylewhittington)]

Same problem on custom build notebook with Intel 7 Series chipset.

GRUB_CMDLINE_LINUX="acpi_osi="

allows me to change with Fn keys but not with system settings slider. No HUD interface either.

[Max Oropeza (moropeza28)]

I also have it the way @KyleWhittington has it. But I'm only alowed to go about half way on dimness.

[Max Oropeza (moropeza28)]

Christopher, I don't know how to update the BIOS on a full Ubuntu computer and Ubuntu forums are still down. Do you by anychance know how to do it? It came in a zip file.

[Max Oropeza (moropeza28)]

OK, so I was able to update my BIOS by installing Windows again. Rebooted into Ubuntu and nothing happened. Nothing's changed I got this from the terminal

maxo@Dayman:~$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
[sudo] password for maxo:
V1.30
08/13/2012

[penalvch (penalvch)]

Max Oropeza, thank you for updating your BIOS. Could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the kernel in the mainline kernels archive directory daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested. For example:
kernel-fixed-upstream-v3.11-rc3

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

As well, please remove the tag:
needs-upstream-testing

If you are unable to test the mainline kernel, please comment as to why specifically you were unable to test it and add the following tags:
kernel-unable-to-test-upstream
kernel-unable-to-test-upstream-VERSION-NUMBER

Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding.

[Max Oropeza (moropeza28)]

So, I was able to install the kernel version 3.11.0-999-generic. Once I rebooted, there was no difference. I changed the GRUB to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" AND
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi='!Windows 2012" AND
GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux acpi_backlight=vendor"

acpi_osi=Linux acpi_backlight=vendor AND quiet splash acpi_osi='!Windows 2012 made it possible to lower the brightness to about halfway but it doesn't show the dialog that says the screen brightness is lowering. But quiet splash acpi_backlight=vendor shows the dialog but doesn't lower the screen brightness. I left the GRUB with GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux acpi_backlight=vendor" for the meantime.

[penalvch (penalvch)]

Max Oropeza, did this problem not occur in a release prior to Raring?

[Max Oropeza (moropeza28)]

When I'd do a fresh install starting with 12.04 (that's when I got the laptop I'm using now) the backlight wouldn't work but it was just a simple solution by changing the GRUB line to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor". So when the time came to update to 12.10 it happened again and that was the solution again, but not with 13.04.

[penalvch (penalvch)]

Max Oropeza, the issue you are reporting is an upstream one. Could you please report this problem through the appropriate channel by following the instructions _verbatim_ at https://wiki.ubuntu.com/Bugs/Upstream/kernel#KernelTeam.2BAC8-KernelTeamBugPolicies.Overview_on_Reporting_Bugs_Upstream ?

Thank you for your understanding.

[Max Oropeza (moropeza28)]

Hello, I filled a buf report on Launchpad about a backlight issue (
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1173961 ). ONe of
the people there suggested to file an upstream bug report and the first
step was to email the maintainer. I don't know what to say since I'm
still sort of knew to Linux and Ubuntu. If you need any additional
information please ask and I'll do the best I can.

[penalvch (penalvch)]

Max Oropeza, if you want to know what to say, then you would want to read what was posted to you in https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1173961/comments/17 .

[Max Oropeza (moropeza28)]

It doesn't really say what to say just who to send it to. Which is why I included this page. It only said to CC this page so emails can appear here.

[penalvch (penalvch)]

Max Oropeza, as per the previously noted URL, it advises you to fill out all the below information and send to appropriate mailing list (which would be linux-acpi in this case):
[1.] One line summary of the problem:
Paste the downstream bug title.

[2.] Full description of the problem/report:
Paste the Bug Description and a link to your Launchpad bug report.

[3.] Keywords (i.e., modules, networking, kernel): Please note, Kernel.org uses a different keyword system then the Ubuntu Tags system.

[4.] Kernel version (from /proc/version):
While booted into the newest upstream mainline kernel only, please execute the following in a terminal and paste the results:
cat /proc/version

[5.] Output of Oops.. message (if applicable) with symbolic information resolved (see Documentation/oops-tracing.txt)
This is only relevant if you had a oops crash (ex. flashing Caps Lock light). While booted into the newest upstream mainline kernel only, if you have a kernel oops, one may consult http://www.kernel.org/doc/Documentation/oops-tracing.txt . If this is too daunting please ask for help in your bug report, and of the Ubuntu community.

[6.] A small shell script or example program which triggers the problem (if possible)
This is for advanced community members. If you feel comfortable enough to do this, please do it. It is not crtical if this is beyond your skill level.

[7.] Environment
Please execute the following in a terminal, and paste the results:
lsb_release -rd

[7.1.] Software (add the output of the ver_linux script here)
While booted into the newest upstream mainline kernel only, this is found in the directory:
/usr/src/linux-headers-<VERSION>/scripts

where <VERSION> is the version of the kernel you are using, found in the directory /usr/src. You may run the script by changing to the directory via a terminal, and paste the results:
sh ver_linux

[7.2.] Processor information (from /proc/cpuinfo):
While booted into the newest upstream mainline kernel only, execute the following in a terminal, and paste the results:
cat /proc/cpuinfo

[7.3.] Module information (from /proc/modules):
While booted into the newest upstream mainline kernel only, execute the following in a terminal, and paste the results:
cat /proc/modules

[7.4.] Loaded driver and hardware information (/proc/ioports, /proc/iomem)
While booted into the newest upstream mainline kernel only, execute the following in a terminal, and paste the results:
cat /proc/ioports
cat /proc/iomem

[7.5.] PCI information ('lspci -vvv' as root)
While booted into the newest upstream mainline kernel only, execute the following via a terminal, and paste the results:
sudo lspci -vvv

[7.6.] SCSI information (from /proc/scsi/scsi)
While booted into the newest upstream mainline kernel only, execute the following via a terminal, and paste the results:
cat /proc/scsi/scsi

[7.7.] Other information that might be relevant to the problem (please look in /proc and include all information that you think to be relevant):
While booted into the newest upstream mainline kernel only, execute the following via a terminal, and paste the results:
ls /proc

[X.] Other notes, patches, fixes, workarounds:
If this is a regression, p...

[Max Oropeza (moropeza28)]

I thought that was for the second step... Ok then, sending sending it right now.

[Max Oropeza (moropeza28)]

[Gateway NV55C] Two backlight interfaces that wont adjust backlight.

Full Description:
I couldn't get the backlight to work after I upgraded to 13.04.

WORKAROUND: The only grub lines that seem to work are these:
GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"
GRUB_CMDLINE_LINUX="acpi_osi="

I tried changing the grub parameters, and after several trys, nothing. I
was asked to run grep . /sys/class/backlight/*/* and got the results of:

maxo@Dayman:~$ grep . /sys/class/backlight/*/*
/sys/class/backlight/acpi_video0/actual_brightness:9
/sys/class/backlight/acpi_video0/bl_power:0
/sys/class/backlight/acpi_video0/brightness:9
grep: /sys/class/backlight/acpi_video0/device: Is a directory
/sys/class/backlight/acpi_video0/max_brightness:9
grep: /sys/class/backlight/acpi_video0/power: Is a directory
grep: /sys/class/backlight/acpi_video0/subsystem: Is a directory
/sys/class/backlight/acpi_video0/type:firmware
/sys/class/backlight/intel_backlight/actual_brightness:976
/sys/class/backlight/intel_backlight/bl_power:0
/sys/class/backlight/intel_backlight/brightness:976
grep: /sys/class/backlight/intel_backlight/device: Is a directory
/sys/class/backlight/intel_backlight/max_brightness:976
grep: /sys/class/backlight/intel_backlight/power: Is a directory
grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory
/sys/class/backlight/intel_backlight/type:raw

But using the Fn Keys, you can only adjust it a little, like from full
brightness to about half. To add something else, with the other
parameters when I adjust with the Fn Keys, the brightness bubble you get
on the top right of your screen doesn't appear.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-19-generic 3.8.0-19.29 [modified:
boot/vmlinuz-3.8.0-19-generic]
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
  USER PID ACCESS COMMAND
  /dev/snd/controlC0: maxo 2482 F.... pulseaudio
Date: Sun Apr 28 07:01:21 2013
HibernationDevice: RESUME=UUID=f71ed279-badf-446b-afc6-d5a75316ec0a
InstallationDate: Installed on 2013-04-25 (2 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Gateway NV55C
MarkForUpload: True
ProcEnviron:
  TERM=xterm
  PATH=(custom, no user)
  XDG_RUNTIME_DIR=<set>
  LANG=en_US.UTF-8
  SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic
root=UUID=bc22ba4b-fcd9-46f3-b10a-11477dd4f618 ro acpi_osi=
acpi_backlight=vendor quiet splash vt.handoff=7
RelatedPackageVersions:
  linux-restricted-modules-3.8.0-19-generic N/A
  linux-backports-modules-3.8.0-19-generic N/A
  linux-firmware 1.106
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/10/2011
dmi.bios.vendor: Gateway
dmi.bios.version: V1.24
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: NV55C
dmi.board.vendor: Gateway
dmi.board.version: V1.24
dmi.chassis.type: 10
dmi.chassis.vendor: Gateway
dmi.chassis.version: V1.24
dmi.modalias:
dmi:bvnGateway:bvrV1.24:bd08/10/2011:svnGateway:pnNV55C:pvrV1.2...

[Max Oropeza (moropeza28)]

I got a failure saying
"The error that the other server returned was: 550 5.7.1 Content-Policy reject msg: The message contains HTML subpart, therefore we consider it SPAM or Outlook Virus. TEXT/PLAIN is accepted.! BF:<H 0>; S1752586Ab3HCWEZ"

Is there a way around it? I just copy and pasted from what I got from my terminal to an email.

[penalvch (penalvch)]

Max Oropeza, when you compose an e-mail via gmail, you would need to click "Plain Text", as noted in:
https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies#Overview_on_Reporting_Bugs_Upstream

>"First Step: E-Mail the Maintainer Process

    Please note, when E-Mailing a maintainer mailing list, do so in plain text, not html. Otherwise, it will be flagged as SPAM and bounced."

[Max Oropeza (moropeza28)]

[Gateway NV55C] Two backlight interfaces that wont adjust backlight.

Full Description:
I couldn't get the backlight to work after I upgraded to 13.04.

WORKAROUND: The only grub lines that seem to work are these:
GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"
GRUB_CMDLINE_LINUX="acpi_osi="

I tried changing the grub parameters, and after several trys, nothing. I
was asked to run grep . /sys/class/backlight/*/* and got the results of:

maxo@Dayman:~$ grep . /sys/class/backlight/*/*
/sys/class/backlight/acpi_video0/actual_brightness:9
/sys/class/backlight/acpi_video0/bl_power:0
/sys/class/backlight/acpi_video0/brightness:9
grep: /sys/class/backlight/acpi_video0/device: Is a directory
/sys/class/backlight/acpi_video0/max_brightness:9
grep: /sys/class/backlight/acpi_video0/power: Is a directory
grep: /sys/class/backlight/acpi_video0/subsystem: Is a directory
/sys/class/backlight/acpi_video0/type:firmware
/sys/class/backlight/intel_backlight/actual_brightness:976
/sys/class/backlight/intel_backlight/bl_power:0
/sys/class/backlight/intel_backlight/brightness:976
grep: /sys/class/backlight/intel_backlight/device: Is a directory
/sys/class/backlight/intel_backlight/max_brightness:976
grep: /sys/class/backlight/intel_backlight/power: Is a directory
grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory
/sys/class/backlight/intel_backlight/type:raw

But using the Fn Keys, you can only adjust it a little, like from full
brightness to about half. To add something else, with the other
parameters when I adjust with the Fn Keys, the brightness bubble you get
on the top right of your screen doesn't appear.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-19-generic 3.8.0-19.29 [modified:
boot/vmlinuz-3.8.0-19-generic]
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
   USER PID ACCESS COMMAND
   /dev/snd/controlC0: maxo 2482 F.... pulseaudio
Date: Sun Apr 28 07:01:21 2013
HibernationDevice: RESUME=UUID=f71ed279-badf-446b-afc6-d5a75316ec0a
InstallationDate: Installed on 2013-04-25 (2 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Gateway NV55C
MarkForUpload: True
ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic
root=UUID=bc22ba4b-fcd9-46f3-b10a-11477dd4f618 ro acpi_osi=
acpi_backlight=vendor quiet splash vt.handoff=7
RelatedPackageVersions:
   linux-restricted-modules-3.8.0-19-generic N/A
   linux-backports-modules-3.8.0-19-generic N/A
   linux-firmware 1.106
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/10/2011
dmi.bios.vendor: Gateway
dmi.bios.version: V1.24
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: NV55C
dmi.board.vendor: Gateway
dmi.board.version: V1.24
dmi.chassis.type: 10
dmi.chassis.vendor: Gateway
dmi.chassis.version: V1.24
dmi.modalias:
dmi:bvnGateway:bvrV1.24:bd08/10/2011:svnGateway:pnNV55C:pvrV1...

[Max Oropeza (moropeza28)]

I didn't get an immediate failure and it's been ten minutes so I think we're good.

[Aaron Lu (aaron-aalu)]

On 08/04/2013 09:12 AM, Maximiliano Oropeza wrote:
> [Gateway NV55C] Two backlight interfaces that wont adjust backlight.
>
> Full Description:
> I couldn't get the backlight to work after I upgraded to 13.04.

Possible to test on v3.10 or v3.11-rcX?

>
> WORKAROUND: The only grub lines that seem to work are these:
> GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"
> GRUB_CMDLINE_LINUX="acpi_osi="
>
> I tried changing the grub parameters, and after several trys, nothing. I
> was asked to run grep . /sys/class/backlight/*/* and got the results of:
>
> maxo@Dayman:~$ grep . /sys/class/backlight/*/*
> /sys/class/backlight/acpi_video0/actual_brightness:9
> /sys/class/backlight/acpi_video0/bl_power:0
> /sys/class/backlight/acpi_video0/brightness:9
> grep: /sys/class/backlight/acpi_video0/device: Is a directory
> /sys/class/backlight/acpi_video0/max_brightness:9
> grep: /sys/class/backlight/acpi_video0/power: Is a directory
> grep: /sys/class/backlight/acpi_video0/subsystem: Is a directory
> /sys/class/backlight/acpi_video0/type:firmware
> /sys/class/backlight/intel_backlight/actual_brightness:976
> /sys/class/backlight/intel_backlight/bl_power:0
> /sys/class/backlight/intel_backlight/brightness:976
> grep: /sys/class/backlight/intel_backlight/device: Is a directory
> /sys/class/backlight/intel_backlight/max_brightness:976
> grep: /sys/class/backlight/intel_backlight/power: Is a directory
> grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory
> /sys/class/backlight/intel_backlight/type:raw

So this is booted without the acpi_backlight=vendor option, right?
And if you adjust the brightness level through the brightness file, does
it work?

>
> But using the Fn Keys, you can only adjust it a little, like from full
> brightness to about half. To add something else, with the other
> parameters when I adjust with the Fn Keys, the brightness bubble you get
> on the top right of your screen doesn't appear.

And this is when you add the acpi_backlight=vendor cmdline?

Thanks,
Aaron

>
> ProblemType: Bug
> DistroRelease: Ubuntu 13.04
> Package: linux-image-3.8.0-19-generic 3.8.0-19.29 [modified:
> boot/vmlinuz-3.8.0-19-generic]
> ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
> Uname: Linux 3.8.0-19-generic x86_64
> NonfreeKernelModules: wl
> ApportVersion: 2.9.2-0ubuntu8
> Architecture: amd64
> AudioDevicesInUse:
> USER PID ACCESS COMMAND
> /dev/snd/controlC0: maxo 2482 F.... pulseaudio
> Date: Sun Apr 28 07:01:21 2013
> HibernationDevice: RESUME=UUID=f71ed279-badf-446b-afc6-d5a75316ec0a
> InstallationDate: Installed on 2013-04-25 (2 days ago)
> InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
> MachineType: Gateway NV55C
> MarkForUpload: True
> ProcEnviron:
> TERM=xterm
> PATH=(custom, no user)
> XDG_RUNTIME_DIR=<set>
> LANG=en_US.UTF-8
> SHELL=/bin/bash
> ProcFB: 0 inteldrmfb
> ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic
> root=UUID=bc22ba4b-fcd9-46f3-b10a-11477dd4f618 ro acpi_osi=
> acpi_backlight=vendor quiet splash vt.handoff=7
> RelatedPackageVersions:
> linux-restricted-modules-3.8.0-19-generic N/A
> linux-backports-modules-3.8.0-19-generic ...

[Max Oropeza (moropeza28)]

Ok, now there was a change. In *acer-wmi*, I put:
> root@Dayman:/home/maxo# cd /sys/class/backlight/
> root@Dayman:/sys/class/backlight# cd /sys/class/backlight/acer-wmi
> root@Dayman:/sys/class/backlight/acer-wmi# cat max_brightness
> 15
> root@Dayman:/sys/class/backlight/acer-wmi# 10
> 10: command not found
> root@Dayman:/sys/class/backlight/acer-wmi# echo 5 > brightness
> root@Dayman:/sys/class/backlight/acer-wmi# echo 7 > brightness
and there was no change at all.

But when I went to *intel_backlight*, I got:
> root@Dayman:/sys/class/backlight/acer-wmi# cd
> /sys/class/backlight/intel_backlight
> root@Dayman:/sys/class/backlight/intel_backlight# cat max_brightness
> 976
> root@Dayman:/sys/class/backlight/intel_backlight# echo 5 > brightness
> root@Dayman:/sys/class/backlight/intel_backlight# echo 7 > brightness
> root@Dayman:/sys/class/backlight/intel_backlight#
and when I put echo 5 > brightness, the screen went super low, the same
with echo 7. I tried changing the brightness using the FN keys and it
went at full brightness and once again I can't lower the brightness to
about half. Same problems as before but *intel_backlight* is the one
that actually changed brightness.

[Aaron Lu (aaron-aalu)]

+Lee, the acer maintainer and sorry for the late reply.

On 08/14/2013 12:14 PM, Maximiliano Oropeza wrote:
> Ok, now there was a change. In *acer-wmi*, I put:
>> root@Dayman:/home/maxo# cd /sys/class/backlight/
>> root@Dayman:/sys/class/backlight# cd /sys/class/backlight/acer-wmi
>> root@Dayman:/sys/class/backlight/acer-wmi# cat max_brightness
>> 15
>> root@Dayman:/sys/class/backlight/acer-wmi# 10
>> 10: command not found
>> root@Dayman:/sys/class/backlight/acer-wmi# echo 5 > brightness
>> root@Dayman:/sys/class/backlight/acer-wmi# echo 7 > brightness
> and there was no change at all.
>
> But when I went to *intel_backlight*, I got:
>> root@Dayman:/sys/class/backlight/acer-wmi# cd
>> /sys/class/backlight/intel_backlight
>> root@Dayman:/sys/class/backlight/intel_backlight# cat max_brightness
>> 976
>> root@Dayman:/sys/class/backlight/intel_backlight# echo 5 > brightness
>> root@Dayman:/sys/class/backlight/intel_backlight# echo 7 > brightness
>> root@Dayman:/sys/class/backlight/intel_backlight#
> and when I put echo 5 > brightness, the screen went super low, the same

The intel_backlight's max_brightness could be very high so the value 5
or 7 are almost identical to 0, you can try some larger values like 500
or 2000 etc.

> with echo 7. I tried changing the brightness using the FN keys and it
> went at full brightness and once again I can't lower the brightness to
> about half. Same problems as before but *intel_backlight* is the one
> that actually changed brightness.

Your system needs some quirk I suppose. BTW, your system only have two
backlight interfaces acer-mi and intel_backlight, is it booting with
acpi_backlight=vendor option?

Thanks,
Aaron

[Max Oropeza (moropeza28)]

Sorry about the lateness, school just started ad I'm kinda busy now. I
did what you said and it was working if I used high numbers like 200.
Also it is booting with this
> acpi_osi=Linux acpi_backlight=vendor
because that's the only way I've made the light go down.

On 08/25/2013 06:40 PM, Aaron Lu wrote:
> +Lee, the acer maintainer and sorry for the late reply.
>
> On 08/14/2013 12:14 PM, Maximiliano Oropeza wrote:
>> Ok, now there was a change. In *acer-wmi*, I put:
>>> root@Dayman:/home/maxo# cd /sys/class/backlight/
>>> root@Dayman:/sys/class/backlight# cd /sys/class/backlight/acer-wmi
>>> root@Dayman:/sys/class/backlight/acer-wmi# cat max_brightness
>>> 15
>>> root@Dayman:/sys/class/backlight/acer-wmi# 10
>>> 10: command not found
>>> root@Dayman:/sys/class/backlight/acer-wmi# echo 5 > brightness
>>> root@Dayman:/sys/class/backlight/acer-wmi# echo 7 > brightness
>> and there was no change at all.
>>
>> But when I went to *intel_backlight*, I got:
>>> root@Dayman:/sys/class/backlight/acer-wmi# cd
>>> /sys/class/backlight/intel_backlight
>>> root@Dayman:/sys/class/backlight/intel_backlight# cat max_brightness
>>> 976
>>> root@Dayman:/sys/class/backlight/intel_backlight# echo 5 > brightness
>>> root@Dayman:/sys/class/backlight/intel_backlight# echo 7 > brightness
>>> root@Dayman:/sys/class/backlight/intel_backlight#
>> and when I put echo 5 > brightness, the screen went super low, the same
> The intel_backlight's max_brightness could be very high so the value 5
> or 7 are almost identical to 0, you can try some larger values like 500
> or 2000 etc.
>
>> with echo 7. I tried changing the brightness using the FN keys and it
>> went at full brightness and once again I can't lower the brightness to
>> about half. Same problems as before but *intel_backlight* is the one
>> that actually changed brightness.
> Your system needs some quirk I suppose. BTW, your system only have two
> backlight interfaces acer-mi and intel_backlight, is it booting with
> acpi_backlight=vendor option?
>
> Thanks,
> Aaron