There are no LCD backlight brightness function and OSD with Fn hot keys under Ubuntu 13.10.

[P.J.Lin]

Steps to reproduce:
#1. Install Ubuntu 13.10 x64
#2. Change OS indication.
$ sudo gedit /etc/default/grub
Find
   GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
Change to
   GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_os_name=Linux acpi_osi="
$ sudo update-grub
(Reboot)
#3.Press hot key Fn+F8 or Fn+F9.

More information:
Our BIOS engineer had already checked the ACPI ASL code and all the necessary event notifications are normally notified as expected while Fn hot key pressed. But this issue is still there. We think there is no Intel graphics driver in Ubuntu 13.10. That's why we need it. There is no problem for all our Shark Bay models with the same ASL event notification under Ubuntu 13.10.

WORKAROUND: LCD backlight brightness function works after adding to GRUB command line:
acpi_backlight=vendor

---
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
DistroRelease: Ubuntu 13.10
InstallationDate: Installed on 2014-01-09 (47 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
Package: linux (not installed)
Tags: saucy
Uname: Linux 3.13.3-031303-generic x86_64
UnreportableReason: The running kernel is not an Ubuntu kernel
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
---
ApportVersion: 2.12.5-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: clevo 1814 F.... pulseaudio
DistroRelease: Ubuntu 13.10
HibernationDevice: RESUME=UUID=223d0897-5f92-40af-874c-05f18ee70f8a
InstallationDate: Installed on 2014-03-03 (0 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: Notebook W54XTU
MarkForUpload: True
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic.efi.signed root=UUID=138fbaf1-adbf-42a3-a04f-99be36d38dab ro quiet splash acpi_os_name=Linux acpi_osi= vt.handoff=7
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
RelatedPackageVersions:
 linux-restricted-modules-3.11.0-12-generic N/A
 linux-backports-modules-3.11.0-12-generic N/A
 linux-firmware 1.116
Tags: saucy
Uname: Linux 3.11.0-12-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 01/21/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 5.6.5
dmi.board.asset.tag: Tag 12345
dmi.board.name: W54XTU
dmi.board.vendor: Notebook
dmi.board.version: V1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 11
dmi.chassis.vendor: Notebook
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr5.6.5:bd01/21/2014:svnNotebook:pnW54XTU:pvrNotApplicable:rvnNotebook:rnW54XTU:rvrV1.0:cvnNotebook:ct11:cvrN/A:
dmi.product.name: W54XTU
dmi.product.version: Not Applicable
dmi.sys.vendor: Notebook

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1279282/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1279282

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[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 v3.13 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/v3.14-rc2-trusty/

[P.J.Lin (pjlin)]

We had updated the kernel linux-image-3.13.3-031303-generic_3.13.3-031303.201402131842_amd64.deb.
After updating to the kernel 3.13.3-031303-generic, the OSD showed up as expected while pressing LCD backlight brightness hot keys. But the LCD backlight brightness function still did not work. We think that this should be the Intel Bay Trail - M graphics driver issue. Intel told us that they will co-work with Canonical on this issue via Launchpad.

[P.J.Lin (pjlin)]

How to add tag 'kernel-bug-exists-upstream' ?

[P.J.Lin (pjlin)]

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[P.J.Lin (pjlin)]

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[penalvch (penalvch)]

P.J.Lin, following https://wiki.ubuntu.com/Kernel/Debugging/Backlight would changing your grub line from:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to either of the following allow you to change the brightness:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video.use_bios_initial_backlight=0"

[penalvch (penalvch)]

P.J.Lin:
>"Two questions : 1. For all other platform (Intel Shark Bar or former chipset), we did not add "acpi_backlight=vendor" to the GRUB command line and the LCD backlight brightness function still works. Only Intel Bay Trail-M platform has this problem, why?"

This is a great question. Unfortunately, I'm not a kernel developer, so I don't have deeper insight on this. However, in order to get this fixed so you wouldn't have to use the kernel parameter, it would be best to report this upstream through the appropriate channel by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/kernel . I would start with the linux-acpi mailing list.

Please provide a direct URL to your e-mail to the mailing list once you have made it so that it may be tracked.

>"2. Does next formal release of Ubuntu 14.04 on next month include the kernel 3.13.3-031303-generic?"

Consulting http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-trusty.git;a=shortlog the current Trusty kernel has been rebased against upstream mainline kernel v3.13.6 (3.13.6-031306):
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.6-trusty/