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[lkp] [drm/i915] 3a03dfb057: [drm:stop_ring [i915]] *ERROR* render ring : timed out trying to stop ring

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FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 3a03dfb057d0ee5f3146ffe40179af3ed7e48213 ("drm/i915: Calculate vblank timestamping constants before enabling vblank.")

[   29.944531] [drm] Driver supports precise vblank timestamp query.
[   29.954553] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[   29.986458] [drm:drm_calc_timestamping_constants [drm]] *ERROR* crtc 21: Can't calculate constants, dotclock = 0!
[   31.008632] [drm:stop_ring [i915]] *ERROR* render ring : timed out trying to stop ring
[   32.022144] [drm:stop_ring [i915]] *ERROR* render ring : timed out trying to stop ring
[   32.031521] [drm:init_ring_common [i915]] *ERROR* failed to set render ring head to zero ctl 0001f001 head 00000064 tail 000000c0 start 00012000
[   32.047317] [drm:i915_gem_init [i915]] *ERROR* Failed to initialize GPU, declaring it wedged
[   32.059922] fbcon: inteldrmfb (fb0) is primary device
[   32.066662] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
[   32.067027] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input6

To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml


Thanks,
Ying Huang

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[lkp] [drm/i915] 3a03dfb057: [drm:stop_ring [i915]] *ERROR* render  ring : timed out trying to stop ring kernel test robot <ying.huang@intel.com> - 2015-08-23 02:10 +0200

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