kernel-packages team mailing list archive

[Quinn Balazs <qtbalazs@xxxxxxxxx>]

Looking back at your last comment, this sounds like the core of the
issue is that there are two interfaces present that are trying to
control brightness. Could you try booting with the kernel boot parameter
of "acpi_backlight=vendor" which should disable acpi_video0 leaving
intel_backlight. Does this improve the issue, or cause additional
problems? Also, now that I've set a package please run  "apport-collect
bug#" so that any logs that may be relevant get attached here. If
"acpi_backlight=vendor" either doesn't help, or causes weird flickery
issues, there are a few other ways to try to cut the number of
interfaces down to one.

Quinn Balazs


** Package changed: ubuntu => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1218547

Title:
  Clevo W350ST brightness keys don't work on Kubuntu

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  The Fn+F8 and Fn+F9 keys are not working on my Clevo W350ST with
  Kubuntu Raring to change screen brightness of the internal laptop
  screen. I installed linux-headers-3.11.0-4, linux-
  headers-3.11.0-4-generic,  linux-image-3.11.0-4-generic and linux-
  image-extra-3.11.0-4-generic  from Saucy packages repository but the
  problem persists.

  When trying:

  $ xev | sed -n 's/^.*state \([0-9].*\), keycode *\([0-9]\+\) *\(.*\), .*$/keycode \2 = \3, state = \1/p'                                                            
  keycode 36 = (keysym 0xff0d, Return), state = 0x10                                           
  keycode 232 = (keysym 0x1008ff03, XF86MonBrightnessDown), state = 0x10                       
  keycode 233 = (keysym 0x1008ff02, XF86MonBrightnessUp), state = 0x10

  Event codes appear correctly.

  And changing:

  /sys/class/backlight/intel_backlight/brightness

  changes the brightness of the screen, but pressing the key combination
  does not. I believe this happens because the key combination is, in
  fact, changing the value of

  /sys/class/backlight/acpi_video0/brightness

  I have

  http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu
  http://ppa.launchpad.net/bumblebee/stable/ubuntu

  in my package sources

  Thanks!

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