[Bug 392948] Re: LCD Brightness won't Change - intel 4 series

[Sean Watson]

Same problem in 13.04. Setting /etc/default/grub and change the cmdline
to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"

Then update-initramfs makes Fn L/R buttons work. Brightness applet still
doesn't work, but at least it remembers the Fn keys work.

uname: Linux sean-Aspire-4736Z 3.8.0-30-generic #44-Ubuntu SMP Thu Aug
22 20:52:24 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

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https://bugs.launchpad.net/bugs/392948

Title:
  LCD Brightness won't Change - intel 4 series

Status in “acpid” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: acpid

  ACPID: acpid-1.0.6
  Distributor ID:	Ubuntu
  Description:	Ubuntu 9.04
  Release:	9.04
  Codename:	jaunty
  kernel: 2.6.28-13-generic
  ---------------------------------------------------

  Problem:
  * FN+LEFT_ARROW key is suppose to reduce LCD brightness is not working.
  * FN+RIGHT_ARROW key is suppose to increase LCD brightness is not working.
  * Notification is working according to key press(for brightness) but the LCD brightness wont change.
  * try to look for acpid log but seems like acpid do not have log in /var/log <-- Which is weird

  ---------------------------------------------------

  Hardware information:

  00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 09)
  00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)
  00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)

  Please let me know if you need more information to solve/get clear
  look on the problem.

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