[Bug 93799] [BYT] Blank screen on DSI display after drm loads on Teclast X80h tablet

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93799

--- Comment #7 from Laszlo Fiat <laszlo.fiat at gmail.com> ---
Created attachment 121245
  --> https://bugs.freedesktop.org/attachment.cgi?id=121245&action=edit
dmesg of kernel compiled from drm-intel-nightly, built-in display doesn't work

I have compiled from intel-nightly-branch as instructed. The built-in display
goes blank after drm loads. There is a WARNING in dmesg in all kernels, where
the display goes blank, this one is from the dmesg of intel-nightly-branch:

[    6.664456] WARNING: CPU: 3 PID: 58 at drivers/gpu/drm/drm_irq.c:1271
drm_wait_one_vblank+0x13b/0x180 [drm]()
[    6.664457] vblank wait timed out on crtc 0

The full dmesg is attached.

Please note that I have a kernel version (linux-next-20151012) where the screen
works correctly, you can find the dmesg as the first attachment for this bug,
if you wish to compare it.

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