[Bug 72754] New: Dual head: screen(s) do not turn back on after power save

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72754

          Priority: medium
            Bug ID: 72754
          Assignee: chris at chris-wilson.co.uk
           Summary: Dual head: screen(s) do not turn back on after power
                    save
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: francart at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Created attachment 90831
  --> https://bugs.freedesktop.org/attachment.cgi?id=90831&action=edit
Xorg log file

Chipset: Intel(R) Ivybridge Mobile (GT2)
Driver: i965
Architecture: x86_64
libdrm version: 2.4.43-0ubuntu
Distro: Ubuntu quantal, kernel 3.5.0-44-generic
Machine: Dell Latitude E6230

I have a dual-head setup. When my monitors go into powersave mode (DPMS) and
thereafter powersave is disabled, randomly one or both do not turn back on (no
backlight, no image). It can be fixed by switching to console and back one or
more times (Ctrl+Alt+F1), or by running xrandr and doing a mode switch (one or
more times). 
I want to emphasise the random nature: it does not always happen, and I have to
repeat the solution one or more times for the problem to disappear. The monitor
that does not turn on is also random (either one or both).

The setup is a Dell Latitude E6230 Laptop on a Dell Docking station. Both
external monitors are connected to the docking station using DVI connectors.
The laptop's display is turned off. This configuration is achieved using 

xrandr --output DP3 --off --output DP2 --off --output DP1 --off --output HDMI3
--mode 1920x1080 --pos 1080x40 --rotate normal --primary --output HDMI2 --mode
1920x1080 --pos 0x0 --rotate left --left-of HDMI3 --output HDMI1 --off --output
LVDS1 --off --output VGA1 --off

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