linux-kernel - Re: Thinkpad brightness keys kill X on 2.6.26.5

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Message-ID: <20081001203346.GB1613@elf.ucw.cz>
Date:	Wed, 1 Oct 2008 22:33:46 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	carbonated beverage <ramune@...-ronin.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Thinkpad brightness keys kill X on 2.6.26.5

On Wed 2008-10-01 11:28:34, Jeremy Fitzhardinge wrote:
> Matthew Garrett wrote:
>> On Tue, Sep 30, 2008 at 05:59:06PM -0700, Jeremy Fitzhardinge wrote:
>>
>>   
>>> On my shiny new X200 running Fedora Rawhide, I'm finding that the  
>>> brightness control keys work OK, but the backlight remains stuck off  
>>> after a resume.  The machine is working fine but the backlight is 
>>> just off; I can see the display under a bright light.  Switching 
>>> consoles and poking about in /sys/class/backlight/acpi_video?/ didn't 
>>> help.
>>>     
>>
>> Intel graphics, right?
>
> Yes.  The new, erm , X4500?
>
>>  The DRM layer should handle full resume on modern Intel hardware, but 
>> there's the potential for bugs. This is entirely unrelated to ACPI, 
>> though.
>>   
>
> OK, that's a good clue.  I poke at acpi to change the brightness, so I'd  
> assumed that acpi would also handle turning the backlight on/off.
>
> I'm using the rawhide rather than standard kernel, but I'd thought they  
> were fairly similar.

I believe vanilla and rawhide kernels are _very_ different in this
area.

On your config, s2ram -f -a 3 may be the right thing after all ;-).

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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