[Bug 55692] [KMS][Cayman] Garbled screen and oops with 6950 with linus git from 20121006 (3.7-rc0)

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Oct 17 23:29:49 PDT 2012


--- Comment #40 from Alexandre Demers <alexandre.f.demers at gmail.com> ---
(In reply to comment #36)
> (In reply to comment #35)
> > I've been playing a bit (booting and restarting with kernel 3.7-rc1) and
> > strangely, what I see is very similar to what I was observing in bug 43655.
> > It was then merged with bug 42373. At the time, attachment 64759 [details] [review]
> > [review] was proposed and a similar patch ended up being commited that fixed
> > bug 43655 for me (but it never fixed bug 42373 on NI CAICOS).
> > 
> > I'll try the workaround used at the time to see if it is really related to
> > bug 43655 (comments 8 and 10) and I'll begin bisecting kernel right after.
> I think what you really want for your caicos is this patch:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;
> h=62444b7462a2b98bc78d68736c03a7c4e66ba7e2

kernel bisected. Here is the culprit commit from what I see here:
62444b7462a2b98bc78d68736c03a7c4e66ba7e2 is the first bad commit
commit 62444b7462a2b98bc78d68736c03a7c4e66ba7e2
Author: Alex Deucher <alexander.deucher at amd.com>
Date:   Wed Aug 15 17:18:42 2012 -0400

    drm/radeon: properly handle mc_stop/mc_resume on evergreen+ (v2)

    - Stop the displays from accessing the FB
    - Block CPU access
    - Turn off MC client access

    This should fix issues some users have seen, especially
    with UEFI, when changing the MC FB location that result
    in hangs or display corruption.

    v2: fix crtc enabled check noticed by Luca Tettamanti

    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

:040000 040000 3e0d33c9b4eda29ced814fe9a863efe63e53f14c
4932561607b160734ec1eade927a9fe18c9f3f1b M    drivers

So it may not be the same bug I'm hitting as Serkan is. Where should I track
this faulty commit/bug? In the NI CAICOS bug or in a new one?

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