[Bug 96996] [BYT] 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 #1 from Laszlo Fiat <laszlo.fiat at gmail.com> ---
I've had this bug open as BUG 93799, then I added it as a duplicate of BUG
90469, which is the same issue on a different hardware, but that bug was tested
on its original hardware, and got closed. 

As I wrote in BUG 90469 Comment 51, the kernels between linux-next-20151012 to
linux-next-20151119 actually worked, there were some red or purple screen for a
second, but then the DSI display worked properly. 
I found out that for later kernels I needed to add i915.fastboot=1 to have the
display working, like 4.6.0-rc4. 
But something went wrong again, because it doesn't work even with
i915.fastboot=1 with newer kernels (I first detected this on 20160517 with
intel-drm-nightly)

With kernels, where the DSI display doesn't work, there are warnings in the
dmesg. In the latest dmesg I get: 

[    8.592431] WARNING: CPU: 3 PID: 59 at
drivers/gpu/drm/i915/intel_display.c:13590
intel_atomic_commit_tail+0x104b/0x1050 [i915]
[    8.592435] pipe A vblank wait timed out

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