[Bug 42373] Radeon HD 6450 (NI CAICOS) screen corruption on boot

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=42373

--- Comment #21 from Kunal <kunal.gangakhedkar@gmail.com> 2012-08-15 15:41:05 UTC ---
Unfortunately, this patch on its own doesn't fix the problem for me. :(

I also noticed a new commit with reference to this bug in Linus' tree when I
synced my git tree:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=81ee8fb6b52ec69eeed37fe7943446af1dccecc5

So, I cherry-picked this patch on top of commit
0937d042b97a9540b5488ab172aa14b53e80014b of Ubuntu's quantal tree from:
git://kernel.ubuntu.com/ubuntu/ubuntu-quantal.git

and built the new kernel from it on 15th Aug., 2012.

And it still doesn't solve the problem for me :(
The behaviour remains the same.

Anything more that I can try?

I tried to apply this patch on top of commit
81ee8fb6b52ec69eeed37fe7943446af1dccecc5, but it fails to apply at all.

I'm now starting to wonder if it's really a driver issue or whether I have
gotten a bad card. But, the fact that I can switch to tty (after repeatedly
hitting ctrl+alt+f1 for about 30-40 times in fast successions) and then restart
kdm without any artifacts suggests that the card is fine.
Could it be some race condition being triggered?

Attaching the dmesg output.

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