>>>> 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
Hey Mark, I'm happy to say I just fixed the screen backlighting on my system, but I'm sorry to say I don't think it will help you with keyboard backlighting. To fix it, I removed 'acpi_backlight=vendor' from grub and added 'echo 0 > /sys/class/backlight/intel_backlight/brightness' to /etc/local.d/backlight.start and made that file executable. Now backlight control works perfectly via the keyboard shortcuts with no other configuration and no xbacklight. I'm on hardened-sources-3.2.2-r1. BTW, I noticed baselayout1.start and baselayout1.stop are no longer created in /etc/local.d. - Grant
