[Bug 81258] New: Hardware polling takes over a second with DisplayPort connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81258

          Priority: medium
            Bug ID: 81258
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Hardware polling takes over a second with DisplayPort
                    connected
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: manuelschneid3r at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

When I use my Dell U2414H connected via DisplayPort the polling for hardware
takes more than a second (using xrandr). Unfortunately this seems to be done by
several Gtk applications and every qt application on startup.

This is dmesg with drm.debug=0xe commandline. I cut about a million
"drm:drm_dp_i2c_do_msg] native defer" lines to make it cleaner
http://pastebin.com/H4Zh9Dny

Environment:
Intel i5-4590, MSI b85i, no dedicated graphics, 8GB, Samsung SSD 840 Evo.
Archlinux, Kernel 3.15.5-1-ARCH, using i915

This happens as well under Ubuntu Live 14.04.

Please contact me if you need more information.

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