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system : dell xps 16 with ubuntu 9.04 (64bit)
kernel : 2.6.28-13-generic
I can't change the brightness of my screen whatever the software I use (when I
move the brightness bar nothing happens)
Keyboard keys (brightness-down,brightness-up) work
This is what returns the command grep -R . /proc/acpi/video/* :
/proc/acpi/video/M86/DP0/EDID:<not supported>
/proc/acpi/video/M86/DP0/brightness:<not supported>
/proc/acpi/video/M86/DP0/state:state: 0x1f
/proc/acpi/video/M86/DP0/state:query: 0x00
/proc/acpi/video/M86/DP0/info:device_id: 0x0220
/proc/acpi/video/M86/DP0/info:type: UNKNOWN
/proc/acpi/video/M86/DP0/info:known by bios: no
/proc/acpi/video/M86/HDTV/EDID:<not supported>
/proc/acpi/video/M86/HDTV/brightness:<not supported>
/proc/acpi/video/M86/HDTV/state:state: 0x1f
/proc/acpi/video/M86/HDTV/state:query: 0x00
/proc/acpi/video/M86/HDTV/info:device_id: 0x0210
/proc/acpi/video/M86/HDTV/info:type: UNKNOWN
/proc/acpi/video/M86/HDTV/info:known by bios: no
/proc/acpi/video/M86/LCD/EDID:<not supported>
/proc/acpi/video/M86/LCD/brightness:<not supported>
/proc/acpi/video/M86/LCD/state:state: 0x1f
/proc/acpi/video/M86/LCD/state:query: 0x00
/proc/acpi/video/M86/LCD/info:device_id: 0x0110
/proc/acpi/video/M86/LCD/info:type: UNKNOWN
/proc/acpi/video/M86/LCD/info:known by bios: no
/proc/acpi/video/M86/CRT/EDID:<not supported>
/proc/acpi/video/M86/CRT/brightness:<not supported>
/proc/acpi/video/M86/CRT/state:state: 0x1f
/proc/acpi/video/M86/CRT/state:query: 0x00
/proc/acpi/video/M86/CRT/info:device_id: 0x0100
/proc/acpi/video/M86/CRT/info:type: UNKNOWN
/proc/acpi/video/M86/CRT/info:known by bios: no
/proc/acpi/video/M86/DOS:DOS setting: <7>
/proc/acpi/video/M86/POST:<not supported>
/proc/acpi/video/M86/POST_info:<not supported>
/proc/acpi/video/M86/ROM:<TODO>
/proc/acpi/video/M86/info:Switching heads: yes
/proc/acpi/video/M86/info:Video ROM: no
/proc/acpi/video/M86/info:Device to be POSTed on boot: no
** Affects: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: Incomplete
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Brightness is "not supported" on dell xps 16
https://bugs.edge.launchpad.net/bugs/405483
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Bugs, which is subscribed to gnome-power-manager in ubuntu.
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