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            <b><a class="bz_bug_link 
          bz_status_NEEDINFO "
   title="NEEDINFO --- - KDE Konsole very slow scrolling with TearFree and QT graphics system native"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=77436#c9">Comment # 9</a>
              on <a class="bz_bug_link 
          bz_status_NEEDINFO "
   title="NEEDINFO --- - KDE Konsole very slow scrolling with TearFree and QT graphics system native"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=77436">bug 77436</a>
              from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
        <pre>This is the stalled process:


[  246.122116] Xorg            D ffff88021fa13800     0  1343   1298 0x00400004
[  246.122117]  ffff8802115bbac8 0000000000000086 ffff880212418210
ffff8802115bbfd8
[  246.122119]  0000000000013800 0000000000013800 ffff880212418210
ffff88021fa140b8
 [  246.122120]  ffff8802116d0000 0000000000000001 0000000000000000
ffff880212418210
[  246.122121] Call Trace:
[  246.122124]  [<ffffffff815cdfb8>] io_schedule+0x98/0x130
[  246.122135]  [<ffffffffa0117915>] __wait_seqno+0x315/0x580 [i915]
[  246.122156]  [<ffffffffa0118a6a>] i915_gem_object_wait_rendering+0x3a/0x70
[i915]
[  246.122174]  [<ffffffffa0118f3b>]
i915_gem_object_finish_gpu.part.50+0xb/0x20 [i915]
[  246.122192]  [<ffffffffa011d6b8>]
i915_gem_object_set_cache_level+0x298/0x350 [i915]
[  246.122211]  [<ffffffffa011d896>]
i915_gem_object_pin_to_display_plane+0x46/0x190 [i915]
[  246.122230]  [<ffffffffa013608f>] intel_pin_and_fence_fb_obj+0x9f/0x140
[i915]
[  246.122262]  [<ffffffffa013617f>] intel_gen7_queue_flip+0x4f/0x300 [i915]
[  246.122295]  [<ffffffffa013e819>] intel_crtc_page_flip+0x1d9/0x3c0 [i915]
[  246.122328]  [<ffffffffa0096bde>] drm_mode_page_flip_ioctl+0x15e/0x2d0 [drm]
[  246.122346]  [<ffffffffa008696d>] drm_ioctl+0x46d/0x570 [drm]
[  246.122350]  [<ffffffff811a23f7>] do_vfs_ioctl+0x2d7/0x4b0
[  246.122356]  [<ffffffff811a2650>] SyS_ioctl+0x80/0xa0
[  246.122359]  [<ffffffff815d807d>] system_call_fastpath+0x1a/0x1f
[  246.122361]  [<00007fd174c481e7>] 0x7fd174c481e6</pre>
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