[Bug 91197] Radeon Trinity 7400G fails with 4K UHD screen - atombios stuck executing BF64

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91197

--- Comment #11 from dennis.jansen at web.de ---
I've found a workaround:

xrandr --newmode "3840x2160_30"   262.92   3840 3888 3920 4000   2160 2163 2168
2191  +hsync 
xrandr --addmode HDMI-0 "3840x2160_30"
xrandr --output HDMI-0 --mode 3840x2160_30

I'm guessing the pixel clock might have been too high. Same problem with the
Windows driver. The page (http://www.epanorama.net/faq/vga2rgb/calc.html)
allowed me to convert the modeline with lower clock created with cru
(http://www.monitortests.com/forum/Thread-Custom-Resolution-Utility-CRU) in
Windows to Linux. I was pleasantly surprised to find even vdpau working well,
of course only up to FullHD video, but smooth playback on 4k resolution.

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