linux-kernel - Re: [PATCH] drm/i915/sdvo: Reorder i2c initialisation before ddc proxy

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Message-ID: <4DD3EF04.8000102@ionic.de>
Date:	Wed, 18 May 2011 18:08:36 +0200
From:	Mihai Moldovan <ionic@...ic.de>
To:	Keith Packard <keithp@...thp.com>,
	Chris Wilson <chris@...is-wilson.co.uk>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/i915/sdvo: Reorder i2c initialisation before ddc
 proxy

* On 18.05.2011 04:40 PM, Keith Packard wrote:
> I've marked this as reviewed, added your additional explanation and
> merged it to drm-intel-next. Seems like it might like a cc to stable?

At the very least it works for me.

So far those special conditions seem to be rare, as the only other 
reference I found was this bug report against the Ubuntu kernel: 
https://bugs.launchpad.net/ubuntu/+bug/783039

(I'm using vanilla, besides the Reiser4 patch.)

I guess it'll hit more i915 users once distros ship 3.6.37 and up.

Thanks again!

As a side note, I'm also seeing those GMBUS and MTRR allocation 
failures, although I think that's pretty harmless.

Cleaned up kernel log ring buffer output:
   http://ionic.de/dmesg-gmbus-fail.txt

I admit that I have no idea what GMBUS is and how critical it is, any 
information on this? It seems to be linked to I2C as well, so I suspect 
yet another hidden bug (though so far with no manifestation).

MTRR allocation may also fail due to BIOS settings, given a similar 
report on http://intellinuxgraphics.org/user.html (Gigabyte GA-965G-DS3 
board). I've got an Intel DQ45CB board (w/ Intel ICH10 chipset), but Fan 
control is set to automatic, too. Sounds familiar and may explain this 
issue. I'll give it a try tomorrow and see whether I still have 
allocation failures or they are gone when switching the fan control mode.

Best regards,

Mihai

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