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I've got HP 8710p laptop with Ubuntu 8.10 intrepid, Kernel 2.6.27-9-generic and
GNOME 2.24.1
My video card is NVIDIA Quadro NVS 320M using 173.14.12 driver version
Everything still works fine except backlight brightness adjustment, and
my problem is interesting and differs from previous bug reports posted
by others.
I can adjust brightness before Ubuntu is loaded (e.g. in grub loader or
bios settings) by pressing Fn+F9/F10, that means these are hardware
keys, right?
When I go to Power Management, i see "Set display brightness to:"
slider, but moving it does no changes to backlight brightness.
When I press Fn+F9/F10 keys to adjust brightness, I see the adjustment
bar at the bottom of my screen, showing more or less brightness when I
press keys, but actually no changes is being made to it. Doing this, I
watch the output of "cat /proc/acpi/video/C14B/C15F/brightness", and the
"current" value changes correctly on keys pressing.
When I exit to console (by pressing Ctrl+Alt+F1), I'm able to change
brightness fine with my keys, and when I go back to GNOME (pressing
Alt+F7) the brightness remains as I've set it in console, and "cat
/proc/acpi/video/C14B/C15F/brightness" displays correct corresponding
"current" value. And again, being in GNOME and pressing my brightness
keys, I'm able to change this "current" value, but no changes are
actually made to backlight.
I've searched all over the Internet for my issue, but could not find
anything, the most of other issues are about unability to change that
"current" value with the keys, but as you see I have some other problem.
I'm a little newbie in Linux, so if you need any logs or some extra
information, I'll be glad to add it to my post.
Any help and replies would be appreciated.
** Affects: ubuntu
Importance: Undecided
Assignee: Linux/ACPI bug zapper team (acpi-bugzilla)
Status: New
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Backlight brightness problem on HP Compaq 8710p
https://bugs.launchpad.net/bugs/308784
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