[Bug 86377] [HSW DP] Blank screen at 3840x2160 resolution (both framebuffer and Xorg)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86377

Daniel Vetter <daniel at ffwll.ch> changed:

           What    |Removed                     |Added
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                 CC|                            |przanoni at gmail.com

--- Comment #12 from Daniel Vetter <daniel at ffwll.ch> ---
Well there's nothing really indicating an error (beyond the fifo underrun) in
the 3.16 dmesg. Grabbing a new one (with drm.debug=0xe from boot until the mode
should be set) can't hurt, but probably won't help.

It really looks like the fifo underrun kills the screen, which usually means
the watermarks are bonkers. Which is expected somewhat since we haven't yet
tried 4k at 60Hz, ever.

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