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-   -   Bug#569892: xbacklight: after having worked before, now just prints "No outputs have backlight property" (http://www.linux-archive.org/debian-kernel/326089-bug-569892-xbacklight-after-having-worked-before-now-just-prints-no-outputs-have-backlight-property.html)

Julien Cristau 02-14-2010 07:08 PM

Bug#569892: xbacklight: after having worked before, now just prints "No outputs have backlight property"
 
reassign 569892 linux-2.6
retitle 569892 [drm/i915] doesn't fall back to native backlight method without a platform driver
kthxbye

On Sun, Feb 14, 2010 at 20:28:30 +0100, Robert Joop wrote:

> xbacklight has stopped working after some sid upgrade a couple of weeks ago.
>
> (I've read about a seemingly similar issue in #563277 and just sat back and waited in the hope that the problem would just be intermediate and would get fixed when all parties involved adjusted to some name change, but it didn't happen...)

Not xbacklight's fault.

xserver-xorg-video-intel used to offer a few methods for changing the
backlight, defaulting to platform drivers providing
/sys/class/backlight/*. With KMS the i915 driver should probably
provide a fallback if there's no platform driver for backlight.

Cheers,
Julien

Robert Joop 02-14-2010 08:48 PM

Bug#569892: xbacklight: after having worked before, now just prints "No outputs have backlight property"
 
On 10-02-14 21:08:25 CET, Julien Cristau wrote:
> Not xbacklight's fault.
>
> xserver-xorg-video-intel used to offer a few methods for changing the
> backlight, defaulting to platform drivers providing
> /sys/class/backlight/*. With KMS the i915 driver should probably
> provide a fallback if there's no platform driver for backlight.

Thank you for the insight.
I can confirm this: I've searched for an older kernel to try one that
predates the introduction of KMS and found
linux-image-2.6.26-2-686_2.6.26-21lenny3_i386.deb.
I've installed and booted it: xbacklight (and the gnome power manager
brightness applet) work again.

I wonder wether #561241 will solve this one, too.

rj



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