[Bug 96996] [BYT][VLV] No picture on DSI display after DRM loads on Teclast X80H tablet

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96996

--- Comment #3 from Laszlo Fiat <laszlo.fiat at gmail.com> ---
Created attachment 126760
  --> https://bugs.freedesktop.org/attachment.cgi?id=126760&action=edit
Dmesg of drm-intel-nightly-2016-09-20

This is a new dmesg of drm-intel-nightly fetched on 2016-09-20. 
This time it is without the i915.fastboot=1 parameter. The screen worked with
i915.fastboot=1 from Nov 2015 to kernel 4.6.7, but not with newer ones.

I made a video of the boot process, but it is really not interesting, the
screen goes blank after line "[7.648499] fb: switching to inteldrmfb from
simple"

There is an WARNING later in the boot log: 

[    9.197313] [drm:intel_dsi_enable] 
[    9.333433] [drm:vlv_pipe_set_fifo_size] Pipe A FIFO split 511 / 511 / 511
[    9.333451] [drm:vlv_update_wm] Setting FIFO watermarks - A: plane=461,
cursor=63, sprite0=0, sprite1=0, SR: plane=0, cursor=0 level=0 cxsr=0
[    9.333457] [drm:intel_enable_pipe] enabling pipe A
[    9.333485] [drm:intel_dsi_enable_nop] 
[    9.389302] ------------[ cut here ]------------
[    9.389560] WARNING: CPU: 2 PID: 61 at
drivers/gpu/drm/i915/intel_display.c:14144
intel_atomic_commit_tail+0x1075/0x10a0 [i915]
[    9.389564] pipe A vblank wait timed out

Could someone please take a look at the log, and tell me what goes wrong?

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