[Bug 59771] New: [xf86-video-intel] Characters and fonts overwriting and/or missing, bad rendering and frozen sections of windows on >2.20.18 only

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59771

          Priority: medium
            Bug ID: 59771
          Assignee: chris at chris-wilson.co.uk
           Summary: [xf86-video-intel] Characters and fonts overwriting
                    and/or missing, bad rendering and frozen sections of
                    windows on >2.20.18 only
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: freedesktop at avrelaun.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 7.7 (2011)
         Component: Driver/intel
           Product: xorg

I've got a bug since 2.20.18, and I'm not the only one:
https://bbs.archlinux.org/viewtopic.php?id=156486

I'm running on a netbook with atom n450 and archlinux, using libdrm 2.4.41.

Basically everything goes well until a intensive video app is launched, like
mplayer2 or skype, then nothing is rendered properly, characters are written on
top of eachothers, half of them are missing, some sections are just black.

Here are some logs (Xorg and dmesg): http://pastebin.mozilla.org/2080842
http://pastebin.mozilla.org/2080843

You can see the repeating error "(EE) intel(0): Failed to submit batch buffer,
expect rendering corruption or even a frozen display: Resource deadlock
avoided."

I have been able to remove this behaviour by downgrading to 2.20.17 (not
2.20.18).

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