[Bug 105834] display corruption on GPD Pocket (Cherry Trail Atom x7-Z8750)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105834

--- Comment #9 from Thomas Orgis <sobukus at sourcemage.org> ---
Sorry for the late reply … the notification got lost …

(In reply to Ville Syrjala from comment #8)
> Does 'xset dpms force off; xset dpms force on' fix the display as well?

Indeed it does.

I also went through the pain of installing the Windows 10 image on this device
and was unable to produce the corruption there. People suggested that my device
is faulty, but I really guess it is within spec, just a bit more prone to this
than others. There is of course a significant element of chance involved, as I
was also unable to reproduce for quite some time on Xubuntu with the
linux-sunxi kernel based on the final 4.16.0. I will test that again after
purging Windows from the device …

> It seems the DSI encoder gets confused somehow and starts sending data out
> of phase. I could imagine that a FIFO underrun could perhaps lead to that
> outcome, but there are none reported in the dmesg.

Any debugging information I could aquire? Could one implement a runtime
diagnostic that recognizes the confusion?

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