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From: Martín Jamilis on 1 Aug 2010 23:10
Hello pals,
I am having problems in adjusting the screen brightness on
Dell Studio 1558 laptop with Debian Squeeze and intel graphics. Pressing the
corresponding Fn keys doesn't change the brightness and gives the following
error:
$ dmesg
....
[ 833.240055] ACPI: Failed to switch the brightness
[ 833.616022] ACPI: Failed to switch the brightness
[ 2182.884115] ACPI: Failed to switch the brightness
[ 2183.107576] ACPI: Failed to switch the brightness

I've tried "echo 10 >
/sys/devices/virtual/backlight/dell_backlight/brightness" without result.
The same with other values.
The file /proc/acpi/video/GFX0/DD01/brightness contains the line "<not
supported>".
There is a bug reported for Ubuntu in:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/568611
There is a patch offered there but I couldn't make it work on latest stable
kernel from kernel.org and there are no instructions available.
Any ideas?
Thanks in advance

Martín
From: Jordon Bedwell on 2 Aug 2010 00:10
On 8/1/2010 9:42 PM, Martín Jamilis wrote:
> Dell Studio 1558

Did you try:
http://en.community.dell.com/support-forums/software-os/w/linux/building-base-ubuntu-factory-iso.aspx
which is how dell does their factory injections of Ubuntu when you
request Ubuntu on their computers.


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From: Klistvud on 2 Aug 2010 04:40
Dne, 02. 08. 2010 04:42:00 je Martín Jamilis napisal(a):

> Any ideas?
> Thanks in advance
>
> Martín
>

In my experience, the feature might be dependent on the video driver
you're using. On my Debian lenny HP laptop (ATI card), the brightness
control works with the proprietary fglrx driver, but doesn't work with
the unaccelerated FLOSS one. On the other hand, the FLOSS driver can
suspend the laptop LCD panel, while the proprietary fglrx driver can't
(the backlight stays permanently on). I just mean to say that your
mileage may vary.

--
Regards,

Klistvud
Certifiable Loonix User #481801
http://bufferoverflow.tiddlyspot.com

Please reply to the list, not to me.


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