On Fri, Mar 16, 2012 at 10:58 AM, Grant <emailgr...@gmail.com> wrote: >>> On my just-released Dell XPS 13 Ultrabook, I can control the backlight >>> with 'xbacklight -set 0' and 'xbacklight -set 100'. Any other values >>> cause the screen to blink and flash. The keyboard backlight shortcuts >>> don't work unless I map them to xbacklight 0 and 100. Also xbacklight >>> doesn't work at all if I'm unplugged from AC. I've tried >>> acpi_osi=Linux and acpi_backlight=vendor in grub.conf. acpi_osi >>> doesn't seem to make any difference and xbacklight doesn't work at all >>> without acpi_backlight. Do I just need to wait for a newer kernel? >> >> Does the gentoo install CD or a rescue CD give you any way to test the >> same backlight functions? If the backlight works correctly when running >> such a CD then listing the loaded kernel modules might give you a clue. > > I tried the latest Kubuntu and Ubuntu LiveCDs via unetbootin but the > backlight behavior is the same as with Gentoo. Please let me know if > anyone has any ideas on this. > > - Grant >
Grant, Sorry I missed this thread earlier. I've got an Asus 17" laptop that I've been trying unsuccessfully to get the keyboard backlighting to work correctly for weeks (maybe months - I no longer remember how long) On my machine I get keyboard backlighting when I boot the machine, but if I turn off the lights with the switch on the machine I cannot so far turn them back on by any means. On this machine xbacklight -get responds that nothing has backlight properties so I've clearly got some configuration issues. As for the kernel I'm using vanilla-sources-3.2.10 so I don't think there's a lot that is newer than that. I don't care much about screen backlighting but keyboard backlighting is important to me. - Mark
