No BACKLIGHT for
kay.sievers at vrfy.org
Wed Apr 28 04:27:14 PDT 2010
On Wed, Apr 28, 2010 at 12:19, Patrice Dumas <pertusus at free.fr> wrote:
> On Wed, Apr 28, 2010 at 11:51:58AM +0200, Kay Sievers wrote:
>> It should be reasonable simple to let X provide internally a generic
>> sysfs backlight driver which can be wired up from individual drivers
>> like radeon.
> I am a complete outsider here, but my first reaction would be to say
> that backlight is much lower level than X. It is also relevant in
> console mode, for framebuffer... More a driver issue than an X issue.
It's the other way around. if X is taking control over the screen, it
should take control over the backlight.
Console issues, and custom setups are not really covered here. And I
guess they always need custom stuff anyway.
> It seems to me that the right reaction is
> Alex Deucher 2010-04-27 15:52:23 PDT
> What do we do on systems with drivers that don't support randr 1.2? Pretty
> much all systems with a backlight control use the kernel backlight interface.
Sure, and some of the current X drivers already use exactly that.
> Then the response seems to refer to DRM which is something I am not
> familiar with, but it seems to be something that other components than X
> cannot use easily.
The backlight is in /sys, everybody with the proper privileges can use
this text-based interface.
This is about providing and not providing abstract interfaces, not to
solve uncommon cases which we can not really solve anyway. :)
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