[Bug 81816] New: Intel HD4400 Graphic (integrated with Haswell): detection of Dell U3011 monitor randomly fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81816

          Priority: medium
            Bug ID: 81816
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Intel HD4400 Graphic (integrated with Haswell):
                    detection of Dell U3011 monitor randomly fails
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mathieu.desnoyers at efficios.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 103554
  --> https://bugs.freedesktop.org/attachment.cgi?id=103554&action=edit
kernel dmesg when screen stuck at 1024x768

External monitor misbehaving intermittently with a Lenovo x240, docked
into an UltraDock, with Dell U3011 connected in the UltraDock
displayport, when booting the machine and starting a X session, as well
as when going back from sleep.

Sometimes, the monitor is just blank. Sometimes, I need to power down
the monitor, unplug its AC for a few minutes, and plug it back again
(and restart the computer) before it starts working again. Sometimes
unplugging the DisplayPort connector from the UltraDock and plugging it
into the second DP helps.

Currently, the behavior is slightly different: it is stuck at a low
resolution (1024x768), as reported by xrandr (even though after a few reboots,
screen power cycles, and swapping the DP port, I'm eventually able to bring the
screen to its native 2560x1600 resolution).

I own 2 Dell U3011 monitors, and 2 Lenovo UltraDock, and each setup have
very similar issues with the same laptop.

Tested on a 3.15.6 Linux kernel.
ii  xserver-xorg-video-intel                     2:2.21.15-2+b2

I'm providing extra info within files attached to this bug report.

Please let me know if I can provide more info,

Thanks,

Mathieu

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