linux-kernel - Re: 4.1-rc7: Xorg broken after resume on thinkpad T40p, radeon problem?

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Message-ID: <1434550978.2400.13.camel@x220>
Date:	Wed, 17 Jun 2015 16:22:58 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Pavel Machek <pavel@....cz>
Cc:	Christian König <christian.koenig@....com>,
	dri-devel@...ts.freedesktop.org, alexander.deucher@....com,
	rjw@...ysocki.net, lenb@...nel.org,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: 4.1-rc7: Xorg broken after resume on thinkpad T40p, radeon
 problem?

On Wed, 2015-06-17 at 16:10 +0200, Pavel Machek wrote: 
> > The above looks very much like the issue that made me write commit
> > 45171002b01b ("radeon: add AGPMode 1 quirk for RV250"). See
> > https://bugzilla.redhat.com/show_bug.cgi?id=531825 for a lot of
> > background.
> > 
> > Does booting with radeon.agpmode=1 survive a suspend and resume cycle?
> 
> Yes, that option helps. Thanks!

Then I suggest you add another quirk for your T40p (after testing
agpmode 2 also). Because this all seems to be caused by a broken BIOS,
and/or broken AGP thingy, and/or broken RV250 (or the interaction of
these things or whatever). Maddening stuff, impossible to debug.

Good luck,


Paul Bolle

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