[Bug 85621] New: [IVB DP] FIFO underrun when trying to set a high display mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85621

            Bug ID: 85621
           Summary: [IVB DP] FIFO underrun when trying to set a high
                    display mode
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: anssi at mageia.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108650
  --> https://bugs.freedesktop.org/attachment.cgi?id=108650&action=edit
Dmesg with drm-intel-nightly, drm.debug=0x06, modeset at 100sec

When trying to set 3440x1440 at 59.94 on a DP monitor, I get the following
messages:

[  494.659559] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe A
[  494.659562] [drm:ivb_err_int_handler] *ERROR* Pipe A FIFO underrun
[  494.659571] [drm:cpt_set_fifo_underrun_reporting] *ERROR* uncleared pch fifo
underrun on pch transcoder A
[  494.659572] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO
underrun

and the screen stays blank until I switch back to e.g. 3440x1440 at 29.97.

This happens with stable 3.17 and with current drm-intel-nightly:
2014y-10m-29d-08h-35m-03s.

Mainboard: ASUS MAXIMUS V GENE, latest BIOS
GPU: 00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200
v2/3rd Gen Core processor Graphics Controller [8086:0162] (rev 09)

Attached dmesg with drm.debug=0x06 on drm-intel-nightly, reg dump with a
working and non-working mode, vbios dump, Xorg.log, and xrandr --verbose.

In the dmesg and Xorg.log, the output is set to 3440x1440 at 59.94 at 100sec, and
to 3440x1440 at 29.97 at 115sec.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20141029/23a22155/attachment.html>