[Bug 59539] New: Frame rate drops significantly when changing monitor resolution for plugable hardware

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59539

          Priority: medium
            Bug ID: 59539
          Assignee: chris at chris-wilson.co.uk
           Summary: Frame rate drops significantly when changing monitor
                    resolution for plugable hardware
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: inteldriver at angrywalls.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

I have a plugable UD-160 running on udl. It requires me to run a xrandr command
before I can use the screen. Once I execute the command, the frame rate drops
significantly and the mouse can be seen as moving extremely slowly. This did
not occur in an older version of the intel driver, so I bisected the code and
the offending commit is:

commit c789d06cf8a0debc67058d7be1483f5b542e2baa

I'm currently running the commit before that,
5891c89ff2be277d1a833d4bc092b65184c1f3d6, and it works fine.

How to reproduce:
1) Have a plugable ud-160
2) Run these xrandr commands:
xrandr --output HDMI1 --mode 1600x1200 --right-of LVDS1
xrandr --output DVI-0 --mode 1600x1200 --right-of HDMI1
3) Monitors set their resolution correctly but the frame rate drops
significantly.

Kernel: Linux tigger 3.7.3-030703-generic #201301171415 SMP Thu Jan 17 19:16:23
UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Please let me know if you need anything else from me.

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