[Bug 95207] [SKL] 5k tiled display issues (dual DP)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95207

--- Comment #20 from Tomas Bzatek <bugs at bzatek.net> ---
I have a AMD FirePro W2100 here for testing. Using radeon drm driver results in
EXACTLY the same kind of image corruption as with i915. Modelines are detected
properly with the drm-displayid-timings branch. However, proprietary fglrx
driver works nicely (being just utterly slow in 2D). Modelines reported by
fglrx are basically equal to my previous findings. Xorg.log attached for
inspiration.

So what are we missing? Is the panel expecting perfectly synchronized both
outputs? (meaning the particular frame data being sent at the exact moment on
both outputs) Is there a driver option to force that? Is it some extra flag in
the DP protocol? Anything else to try?

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