[Bug 97412] vblank wait timeout, giving kernel panic, while switching TTY

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97412

--- Comment #4 from Marcel Dijkstra <marcel.foss at gmail.com> ---
Created attachment 129444
  --> https://bugs.freedesktop.org/attachment.cgi?id=129444&action=edit
drm-tip kernel oops

---=[ description ]=---
The kernel oops occurs after switching several times between TTY2 and X11(DRI3,
SNA) on my Lenovo ThinkPad (attachment).
Switching back to X11 can take several seconds and a few more seconds before
X11 becomes responsive. 
After kernel oops the mouse pointer can dissapear repeatedly, taking again few
seconds for X11 to become responsive and for mouse pointer to reappear.
Again a "flip_done time out" is seen in "dmesg" every time it happens
(attachment).
No issues occur trying to switch several times between TTY2 and X11(DRI3, SNA)
on an Intel Core-i3 NUC with same Arch Linux and "4.10.0-rc7-drmtip" kernel.

---=[ system info ]=---
distro: Arch Linux, arch: x86_64
linux: 4.10.0-rc7-drmtip (git#2699547: integration manifest)
xf86-video-intel: 1:2.99.917+753+g9fe04af4-1
mesa: 13.0.4-1
xorg-server: 1.19.1-1
kernel-param: i915.modeset=1 drm.debug=0x1e

machine-1: Lenovo ThinkPad T520, model 42435JG
cpu: CPU0: Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz (family: 0x6, model: 0x2a,
stepping: 0x7)
lspci: 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)

machine-2: Intel NUC5i3RYB
CPU0: Intel(R) Core(TM) i3-5010U CPU @ 2.10GHz (family: 0x6, model: 0x3d,
stepping: 0x4)
lspci: 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500
(rev 09)

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