From: Mark Knecht <markknecht@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Re: Backlight problems
Date: Fri, 16 Mar 2012 11:15:48 -0700 [thread overview]
Message-ID: <CAK2H+ed+Rjs3Uk7KzH4Wx300oioLvzTSVAd4+qV=Dos44fFeyQ@mail.gmail.com> (raw)
In-Reply-To: <CAN0CFw26pxVvL=3CiHv6N+557fHM5-+uCLCUxQkA=sA3SDuZUQ@mail.gmail.com>
On Fri, Mar 16, 2012 at 10:58 AM, Grant <emailgrant@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
next prev parent reply other threads:[~2012-03-16 18:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-04 21:16 [gentoo-user] Backlight problems Grant
2012-03-05 0:38 ` [gentoo-user] " walt
2012-03-05 1:14 ` Grant
2012-03-16 17:58 ` Grant
2012-03-16 18:15 ` Mark Knecht [this message]
2012-03-16 18:55 ` Grant
2012-03-16 19:25 ` Mark Knecht
2012-03-16 19:33 ` Mark Knecht
2012-03-16 20:06 ` Grant
2012-03-16 22:36 ` Neil Bothwick
2012-03-17 0:11 ` Grant
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