[Bug 90909] New: [HSW DP] Can't get 4k at 60Hz (pipe underruns)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90909

            Bug ID: 90909
           Summary: [HSW DP] Can't get 4k at 60Hz (pipe underruns)
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: tmadeira at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 116382
  --> https://bugs.freedesktop.org/attachment.cgi?id=116382&action=edit
dmesg output when I run 'xrandr --output DP1 --mode 3840x2160'

I have a Lenovo ThinkPad X240 with a Intel Graphics HD 4400 [Haswell-ULT GPU
8086:0a16] and I'm running Arch Linux x86_64 with kernel
4.1.0-rc6-drm_intel_nightly_20150607. I've recently got a Dell P2415Q monitor
and I can't get 3840x2160 at 60Hz via Mini DisplayPort to work (right now I'm
running 3840x2160 at 35Hz). When I run "xrandr --output DP1 --mode 3840x2160", I
get a "drm:intel_set_cpu_fifo_underrun_reporting" (complete dmesg output
attached).

Kernel options: video.use_native_backlight=0 i915.enable_ips=0

This looks similtar to https://bugs.freedesktop.org/show_bug.cgi?id=90043
(except that I have a HSW instead of BDW) but the latest drm-intel-nightly did
not fix it for me.

Any clue on what's going on or plans to fix it? Any other info I can provide to
help?

Thanks,
Tiago

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