[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

--- Comment #11 from Brian Campbell <brian.campbell at editshare.com> ---
After some more testing, I've determined that I can get the full resolution to
work, at 30 Hz, with "xrandr --display DP1 --mode 0x47" (in both 3.16 and a
build of drm-intel-nightly; I could have sworn I'd tried that before doing this
testing, but it seems to be working now).

Using the full 60Hz refresh rate (just letting it auto-detect, or using --mode
3840x1920, or --mode 0x46), I the same error on 3.16 and drm-intel-nightly,
with just a slight difference in the exact string. Now the error is:

Nov 25 20:24:13 scratch kernel: [47301.178057]
[drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo
underrun on pipe A
Nov 25 20:24:13 scratch kernel: [47301.178087] [drm:ironlake_irq_handler
[i915]] *ERROR* CPU pipe A FIFO underrun

If it would be useful for me to dump any more information on the
drm-intel-nightly kernel, let me know.

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