[Bug 725707] Re: Backlight not changing on Gateway NV59C70u: Ubuntu 10.04

[komputes]

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

** Changed in: acpid (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/725707

Title:
  Backlight not changing on Gateway NV59C70u: Ubuntu 10.04

Status in “acpid” package in Ubuntu:
  Incomplete

Bug description:
  There is a problem with the backlight control. The hotkeys splashes
  the backlight adjust screen and the backlight can be adjusted. The
  backlight value also gets updated when a xrandr --props is done.
  However, there is no perceptible change on screen. The backlight works
  perfectly fine in Windows 7 with which the system is dual-booted.

  The os used is Ubuntu 10.04 (Linux 2.6.32-28-generic #55-Ubuntu SMP
  Mon Jan 10 23:42:43 UTC 2011 x86_64 GNU/Linux). The hardware is a
  Gateway NV59C70u with i5 quadcore 2.67 GHz 64 bit.

  Used the /etc/default/grub update of the GRUB_CMDLINE_LINUX="nomodeset
  acpi_backlight=vendor" but nomodeset option makes the screen go blank
  just before login. Without the nomodeset option, the backlight hotkeys
  are disabled.

  Any help is appreciated.

  ----- xrandr --props output ------
  Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
  VGA1 disconnected (normal left inverted right x axis y axis)
  LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
  	EDID:
  		00ffffffffffff0006afec2200000000
  		01130103802213780ac8959e57549226
  		0f505400000001010101010101010101
  		010101010101121b5642500026302018
  		340058c1100000180000000f00000000
  		00000000000000000020000000fe0041
  		554f0a202020202020202020000000fe
  		004231353658573032205632200a00c0
  	BACKLIGHT: 3 (0x00000003)	range:  (0,9)
  	Backlight: 3 (0x00000003)	range:  (0,9)
  	scaling mode:	Full
  		supported: None         Full         Center       Full aspect 
     1366x768       60.0*+
     1360x768       59.8  
     1024x768       85.0     75.0     70.1     60.0  
     832x624        74.6  
     800x600        85.1     72.2     75.0     60.3     56.2  
     640x480        85.0     72.8     75.0     59.9  
     720x400        85.0  
     640x400        85.1  
     640x350        85.1  
  HDMI1 disconnected (normal left inverted right x axis y axis)
  DP1 disconnected (normal left inverted right x axis y axis)

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