On Thu, 20 Oct 2011 22:07:41 +0200, rudu wrote:
My question isn't debian specific, but I guess a similar problem might
occur with debian on that laptop.
Nice try ;-)
I'm configuring a double boot Win7/Ubuntu 10.04.03 on a Dell XPS L502X
for a friend of mine.
Everything's Ok except for those Fn Backlight Up/Down Keys. The others
Fn Keys for sound, wifi, touchpad disabling, etc. work fine.
How about setting the backlight bright from the GNOME power management
applet? Does it work from there?
I googled the web for hours, and found several grub tweaking through the
/etc/default/grub file and his GRUB_CMDLINE_LINUX_DEFAULT parameter. So
far I tried :
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash noacpi"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nolapic"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=video"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash dell_acpi" ... without success.
Is there anything logged at dmesg related to this acpi problem? (dmesg |
grep -i acpi)
If someone can shed some light on this one I would be very grateful.
Mmm, you can consider:
a) Asking at Ubuntu forums/mailing lists
b) Open a bug report in Ubuntu for the non-functional function keys
c) Try with a new kernel version (from a LiveCD to avoid messing up
things)
d) Using "xbacklight" application
Greetings,