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

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Date:	Wed, 01 Oct 2008 11:28:34 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	Pavel Machek <pavel@...e.cz>,
	carbonated beverage <ramune@...-ronin.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Thinkpad brightness keys kill X on 2.6.26.5

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'm also using the vesa X server; I haven't tried using the intel one yet.

    J
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