1002:6740 [iMac12,2] No brightness control

[Pedro Marques]

Hello,

I have no brightness control on imac 27 Core i5-2500S (poduct model: imac 12.2) running ubuntu trysty with xorg video ati driver.

tried to use fglrx proprietary drivers, and end up with black screen and unable to boot.

i only needed to low down brightness a little..
---
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: pfmarques 2190 F.... pulseaudio
 /dev/snd/controlC0: pfmarques 2190 F.... pulseaudio
CRDA:
 country AW:
  (2402 - 2482 @ 40), (N/A, 20)
  (5170 - 5250 @ 40), (N/A, 20)
  (5250 - 5330 @ 40), (N/A, 20), DFS
  (5490 - 5710 @ 40), (N/A, 27), DFS
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=0c9bef7b-65b8-41bf-9548-6cf11bdd4059
InstallationDate: Installed on 2014-11-25 (5 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Apple Inc. iMac12,2
Package: linux (not installed)
ProcFB:
 0 inteldrmfb
 1 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-40-generic.efi.signed root=UUID=dba8f74a-366d-4de8-862c-f0118c556c07 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
PulseList:
 Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
 No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-40-generic N/A
 linux-backports-modules-3.13.0-40-generic N/A
 linux-firmware 1.127.8
Tags: trusty
Uname: Linux 3.13.0-40-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

WifiSyslog:
 Dec 1 11:54:46 pfmarques-iMac wpa_supplicant[992]: message repeated 75 times: [ wlan0: CTRL-EVENT-SCAN-STARTED ]
 Dec 1 11:54:49 pfmarques-iMac wpa_supplicant[992]: nl80211: send_and_recv->nl_recvmsgs failed: -33
 Dec 1 11:55:49 pfmarques-iMac wpa_supplicant[992]: wlan0: CTRL-EVENT-SCAN-STARTED
 Dec 1 12:01:14 pfmarques-iMac kernel: [ 5030.247003] perf samples too long (2512 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
 Dec 1 12:08:29 pfmarques-iMac kernel: [ 5465.506679] systemd-hostnamed[7862]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!
_MarkForUpload: True
dmi.bios.date: 01/24/12
dmi.bios.vendor: Apple Inc.
dmi.bios.version: IM121.88Z.0047.B1F.1201241648
dmi.board.name: Mac-942B59F58194171B
dmi.board.vendor: Apple Inc.
dmi.board.version: iMac12,2
dmi.chassis.type: 13
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-942B59F58194171B
dmi.modalias: dmi:bvnAppleInc.:bvrIM121.88Z.0047.B1F.1201241648:bd01/24/12:svnAppleInc.:pniMac12,2:pvr1.0:rvnAppleInc.:rnMac-942B59F58194171B:rvriMac12,2:cvnAppleInc.:ct13:cvrMac-942B59F58194171B:
dmi.product.name: iMac12,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

[penalvch (penalvch)]

Pedro Marques, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect 1397088

[Pedro Marques (pedropitt)]

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[Pedro Marques (pedropitt)]

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[Pedro Marques (pedropitt)]

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[Pedro Marques (pedropitt)]

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[Pedro Marques (pedropitt)]

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[Pedro Marques (pedropitt)]

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[Pedro Marques (pedropitt)]

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[Pedro Marques (pedropitt)]

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[Pedro Marques (pedropitt)]

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[Pedro Marques (pedropitt)]

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[Pedro Marques (pedropitt)]

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[Pedro Marques (pedropitt)]

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[Pedro Marques (pedropitt)]

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[Pedro Marques (pedropitt)]

Hello Christopher,

Sorry for the late reply, the imac is in my workplace, only could run
command today.
its done, anything else please let me know.

thanks again!

Pedro Marques

On Sat, Nov 29, 2014 at 4:19 AM, Christopher M. Penalver <
<email address hidden>> wrote:

> Pedro Marques, thank you for taking the time to report this bug and
> helping to make Ubuntu better. Please execute the following command, as it
> will automatically gather debugging information, in a terminal:
> apport-collect 1397088
>
> ** Package changed: xserver-xorg-video-ati (Ubuntu) => linux (Ubuntu)
>
> ** Changed in: linux (Ubuntu)
> Importance: Undecided => Low
>
> ** Changed in: linux (Ubuntu)
> Status: New => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1397088
>
> Title:
> No brightness control on imac 27 Core i5-2500S - ubuntu trysty
>
> Status in linux package in Ubuntu:
> Incomplete
>
> Bug description:
> Hello,
>
> I have no brightness control on imac 27 Core i5-2500S (poduct model:
> imac 12.2) running ubuntu trysty with xorg video ati driver.
>
> tried to use fglrx proprietary drivers, and end up with black screen
> and unable to boot.
>
> i only needed to low down brightness a little..
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1397088/+subscriptions
>

--
Com os melhores cumprimentos,

Pedro Marques

[penalvch (penalvch)]

Pedro Marques, could you please test the latest upstream kernel available from the very top line at the top of the page (the release names are irrelevant for testing, and please do not test the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue.

If the test did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. 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 exactly shown as:
kernel-fixed-upstream-3.18-rc7

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.

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

[Pedro Marques (pedropitt)]

Hello,

Currently running that version:

pfmarques@pfmarques-iMac:~$ uname -a
Linux pfmarques-iMac 3.18.0-031800rc7-generic #201411302035 SMP Mon Dec 1 01:36:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Still no brightness control :(

thanks!

[penalvch (penalvch)]

Pedro Marques, do any of the following provide a WORKAROUND via https://wiki.ubuntu.com/Kernel/Debugging/Backlight#Testing_for_a_work_around ?

For now, don't worry about attaching any debugging information requested in the article.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]