linux-kernel - Re: radeonfb i2c regression post-2.6.18.

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Message-ID: <87oddoaqa6.fsf@hardknott.home>
Date:	Wed, 21 Nov 2007 09:42:09 +0000
From:	Roger Leigh <rleigh@...nlatter.ukfsn.org>
To:	benh@...nel.crashing.org
Cc:	Jean Delvare <khali@...ux-fr.org>, linux-kernel@...r.kernel.org,
	Dennis Munsie <dmunsie@...ropia.com>,
	Michael Buesch <mb@...sch.de>
Subject: Re: radeonfb i2c regression post-2.6.18.

Benjamin Herrenschmidt <benh@...nel.crashing.org> writes:

> On Sun, 2007-11-18 at 21:58 +0000, Roger Leigh wrote:
>> Hi folks,
>> 
>> I'm using an Apple Cinema Display connected via DVI to an Apple Mac
>> Mini with Radeon 9200 graphics. This used to work fine, but with
>> kernels >= 2.6.19, the monitor powers off as soon as the framebuffer
>> is initialised, making for a less than usable system. I've tested
>> with 2.6.(19|2[012]), and I didn't see any related changes in 2.6.23.
>
>    .../...
>
> Can you try the patch from Jean that I pasted below and let us know if
> it helps ? It looks like the releasing of the i2c lines may have been
> done backward.

This patch fixes the problem.  The monitor stays powered on during the
switch to the framebuffer.


Thanks,
Roger

-- 
  .''`.  Roger Leigh
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