[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

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #8 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Does 'xset dpms force off; xset dpms force on' fix the display as well?

The corruption apparently happens when just page flipping. That sort of rules
out straightforward bugs in the DSI enable sequence.

And the panel seems to be even the most simple type you can have:
[    4.063972] [drm:intel_dsi_vbt_init [i915]] Mode video
[    4.064020] [drm:intel_dsi_vbt_init [i915]] Dual link: NONE
[    4.064093] [drm:intel_dsi_vbt_init [i915]] Pixel Format 0

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.

So unfortunately I don't have any good ideas as to the cause of the bug.

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