Subject: Re: Trying to fix radeonfb suspending on IBM Thinkpad T41
From: Volker Braun <vbraun@physics.upenn.edu>
To: Antti Andreimann <Antti.Andreimann@mail.ee>
Cc: linux-kernel@vger.kernel.org
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Date: Sat, 22 Jan 2005 23:33:09 -0500
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I have no knowledge of the internals of the radeon family, but I am
under the impression that they require some hacks to work around bugs in
the silicon. There is a rather big patch coming, see

http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.11-
rc1/2.6.11-rc1-mm2/broken-out/radeonfb-massive-update-of-pm-code.patch

This patch also rewrites the questionable section in
radeon_pm_setup_for_suspend. I just found it and have not yet built a
new kernel, so I cannot comment on its effectiveness. 

For reference, the power management issues of the T41 have their own
bugzilla entry:

http://bugme.osdl.org/show_bug.cgi?id=3022

On a side note, since kernel 2.6.10 I have not been able to successfully
resume from acpi S3 + radeonfb any more (T41 2379-DJU, radeon mobility
M9) - works under 2.6.9 and 2.6.11-rc1 + vgaconsole. I'm still trying to
isolate the problem/waiting for some of the pm code to settle.

Best,
Volker


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