From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andy Furniss <andyqos@ukfsn.org>
Subject: Re: radeon 0000:02:00.0: GPU lockup CP stall for more than 10000msec
Date: Sun, 23 Dec 2012 11:01:37 +0000
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To: Borislav Petkov <bp@alien8.de>, Alex Deucher <alexdeucher@gmail.com>, Alex Deucher <alexander.deucher@amd.com>, dri-devel@lists.freedesktop.org, lkml <linux-kernel@vger.kernel.org>
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Borislav Petkov wrote:

> [   28.191072] radeon: `0' invalid for parameter `wb'
>
> although the whole driver blubber didn't appear on the console fterwards
> aso something got turned off allright.
>
> Then, I went and tried "radeon.no_wb" where the driver blubber appeared
> but AGP writeback was still enabled:

no_wb=1 should work.