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Date: Fri, 16 Mar 2012 10:58:44 -0700
Message-ID: <CAN0CFw26pxVvL=3CiHv6N+557fHM5-+uCLCUxQkA=sA3SDuZUQ@mail.gmail.com>
Subject: Re: [gentoo-user] Re: Backlight problems
From: Grant <emailgrant@gmail.com>
To: gentoo-user@lists.gentoo.org
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>> On my just-released Dell XPS 13 Ultrabook, I can control the backlight
>> with 'xbacklight -set 0' and 'xbacklight -set 100'. =A0Any other values
>> cause the screen to blink and flash. =A0The keyboard backlight shortcuts
>> don't work unless I map them to xbacklight 0 and 100. =A0Also xbacklight
>> doesn't work at all if I'm unplugged from AC. =A0I've tried
>> acpi_osi=3DLinux and acpi_backlight=3Dvendor in grub.conf. =A0acpi_osi
>> doesn't seem to make any difference and xbacklight doesn't work at all
>> without acpi_backlight. =A0Do 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? =A0If the backlight works correctly when runnin=
g
> 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