kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

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/

** Changed in: linux (Ubuntu)
       Status: Confirmed => Triaged

-- 
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https://bugs.launchpad.net/bugs/1279282

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

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  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

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