From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 44800] Radeon HD 6450 CAICOS screen corruption and kernel crashes
Date: Mon, 16 Jan 2012 19:26:00 +0000
Message-ID: <bug-44800-502-n0YqNk6KPU@http.bugs.freedesktop.org/>
References: <bug-44800-502@http.bugs.freedesktop.org/>
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https://bugs.freedesktop.org/show_bug.cgi?id=44800

--- Comment #8 from Marko Kohtala <marko.kohtala@gmail.com> 2012-01-16 11:26:00 PST ---
Created attachment 55650
  --> https://bugs.freedesktop.org/attachment.cgi?id=55650
dmesg with enable_mtrr_cleanup

Attached the dmesg with The /proc/mtrr is 

reg00: base=0x000000000 (    0MB), size= 8192MB, count=1: write-back
reg01: base=0x200000000 ( 8192MB), size=  512MB, count=1: write-back
reg02: base=0x0e0000000 ( 3584MB), size=  512MB, count=1: uncachable
reg03: base=0x21f800000 ( 8696MB), size=    8MB, count=1: uncachable

and with enable_mtrr_cleanup mtrr_spare_reg_nr=1 options

reg00: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back
reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back
reg02: base=0x0c0000000 ( 3072MB), size=  512MB, count=1: write-back
reg03: base=0x100000000 ( 4096MB), size= 4096MB, count=1: write-back
reg04: base=0x200000000 ( 8192MB), size=  512MB, count=1: write-back
reg05: base=0x21f800000 ( 8696MB), size=    8MB, count=1: uncachable
reg06: base=0x0e0000000 ( 3584MB), size=  256MB, count=1: write-combining

It makes no difference.

I installed 32-bit debian 3.1.0 kernel and compiled fglrx for it and am now
reporting this with it. It does not have the artefacts, but is not quite
perfect either (gnome-shell 3.2.1 animations flicker like scaling of windows
does not work as expected, but no artifacts, possibly of no interest to you).

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