[xen iommu] After upgrading to Linux 3.19, desktop no longer works in Xen 4.5.0 dom0
Submitted by Ting-Wei Lan @lantw
Assigned to Intel GFX Bugs mailing list
Description
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