[Bug 62311] New: Screen freeze/hard lockup after DisplayPort monitor was connected

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=62311

            Bug ID: 62311
           Summary: Screen freeze/hard lockup after DisplayPort monitor
                    was connected
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.11.1
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: milan.plzik at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 109891
  --> https://bugzilla.kernel.org/attachment.cgi?id=109891&action=edit
lspci -v of the system

After connecting and enabling display using DisplayPort, using chrome to play
video/google maps/... on external screen usually causes few-second screen
freeze followed by these lines in dmesg:

[163015.696253] Watchdog[2074]: segfault at 0 ip 00007f05e2a53638 sp
00007f05d057a640 error 6 in chromium[7f05e1d3c000+4c8c000]
[163017.244564] [drm:ring_stuck] *ERROR* Kicking stuck wait on render ring
[163022.245406] [drm:ring_stuck] *ERROR* Kicking stuck wait on render ring

Eventually, this might also result in hard lockup of the system (cursor does
not move, magic sysrq does not work, machine does not reply to ping, nothing
recorded in logs). System is Lenovo Thinkpad X220 tablet (attached lspci.txt).
Kernel is 3.11.1, arch x86_64 .

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