[Bug 90037] New: After upgrading to Linux 3.19, desktop no longer works in Xen 4.5.0 dom0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90037

            Bug ID: 90037
           Summary: After upgrading to Linux 3.19, desktop no longer works
                    in Xen 4.5.0 dom0
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: lantw44 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

When using Linux 3.19 and 4.0 as the dom0 kernel of Xen 4.5.0, characters on
the screen become broken after the graphic driver is loaded. Please see the
attached screenshot.

After Xorg is started by GDM, it causes more error and my monitor is turned off
because of no signal.

[  337.673979] [drm] stuck on render ring
[  337.676815] [drm] GPU HANG: ecode 5:0:0xfdffffff, in Xorg.bin [2221],
reason: Ring hung, action: reset
[  337.676817] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[  337.676818] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[  337.676818] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[  337.676819] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[  337.676820] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[  337.680940] drm/i915: Resetting chip after gpu hang
[  343.665948] [drm] stuck on render ring
[  343.669709] [drm] GPU HANG: ecode 5:0:0xfdffffff, in Xorg.bin [2221],
reason: Ring hung, action: reset
[  343.670016] [drm:i915_set_reset_status [i915]] *ERROR* gpu hanging too fast,
banning!
[  343.673893] drm/i915: Resetting chip after gpu hang
[  345.086609] BUG: unable to handle kernel NULL pointer dereference at
0000000000000020

Please see the attached dmesg and crash dump. This problem causes the desktop
unstable and unusable.


Hardware:
Intel Core i5 CPU 650 @ 3.20GHz
Intel Ironlake Desktop

Software:
Bad version:  Xen 4.5.0 and Linux 3.19.2, 3.19.3, 3.19.4, 4.0
Good version: Xen 4.5.0 and Linux 3.18.7

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