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

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Date:	Tue, 30 Sep 2008 17:59:06 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Pavel Machek <pavel@...e.cz>
CC:	carbonated beverage <ramune@...-ronin.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Thinkpad brightness keys kill X on 2.6.26.5

Pavel Machek wrote:
> Hi!
>
>   
>> I just upgraded from 2.6.25.17 to 2.6.26.5 on my Thinkpad Z61t, and found
>> the brightness keys will cause the X server to die.  When using the
>> brightness up/down keys, the screen will go blank -- Control+Alt+F# will
>> still switch to a different virtual console, but switching back will not
>> restore the video state.
>>
>> After killing the window manager, I was able to bring up X again without
>> a problem -- but using the brightness keys still causes it to go blank
>> again within X, while the brightness does get changed correctly on the
>> console.
>>
>> There were no kernel messages, but this appeared in the Xorg log:
>>     
>
> Yes, I had similar problems... for me it blanked screen on closing
> lid. Problem disappeared after upgrading X...
>
>   
>> .config attached -- is this a known issue?  In the meantime, I'm starting
>> a bisection to figure out where the problem crops up.
>>     
>
> For me CONFIG_ACPI_VIDEO never really worked...
>   

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.

    J
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