[Bug 89998] DisplayPort Cant's set 60hz refresh rate

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89998

--- Comment #3 from Tiago Madeira <tmadeira at gmail.com> ---
@Marat, have you managed to solve this problem?

I'm having a similar issue with a Lenovo ThinkPad X240 (Intel HD Graphics 4400)
connected via DisplayPort to a Dell P2415Q monitor. The 3840x2160 30MHz and
35MHz modes work fine, but 60MHz gives a blank screen (so it's a little bit
different than yours) and dmesg reports:

[ 3235.577003] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
uncleared fifo underrun on pipe B
[ 3235.577018] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun

Running Kernel 4.0.4-2-ARCH #1 x86_64 (Arch Linux), but can try some version
from the Intel branch if that helps.

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