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On 03/04/2012 01:16 PM, Grant wrote: |
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> On my just-released Dell XPS 13 Ultrabook, I can control the backlight |
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> with 'xbacklight -set 0' and 'xbacklight -set 100'. Any other values |
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> cause the screen to blink and flash. The keyboard backlight shortcuts |
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> don't work unless I map them to xbacklight 0 and 100. Also xbacklight |
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> doesn't work at all if I'm unplugged from AC. I've tried |
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> acpi_osi=Linux and acpi_backlight=vendor in grub.conf. acpi_osi |
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> doesn't seem to make any difference and xbacklight doesn't work at all |
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> without acpi_backlight. Do I just need to wait for a newer kernel? |
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Does the gentoo install CD or a rescue CD give you any way to test the |
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same backlight functions? If the backlight works correctly when running |
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such a CD then listing the loaded kernel modules might give you a clue. |
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