[Bug 58769] New: GDM can't show and screen freeze after run screen saver and turn off backlight command on Haswell chipset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58769

          Priority: medium
            Bug ID: 58769
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: GDM can't show and screen freeze  after run screen
                    saver and turn off backlight command on Haswell
                    chipset
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: evawang at linpus.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 72120
  --> https://bugs.freedesktop.org/attachment.cgi?id=72120&action=edit
dmesg.log

GDM can't show and screen freeze after screen saver and turn off backlight
command("gnome-screensaver-command -l;sleep 3;xset dpms force off")
But, if you press Ctrl+Alt+F3(tty3) then press Ctrl+Alt+F2(tty0), GDM will
show.

Dmesg:
[11577.928164] [drm:intel_dp_set_link_train] *ERROR* Timed out waiting for DP
idle patterns
[11577.928167] [drm:i915_write32] *ERROR* Unknown unclaimed register before
writing to 64040

Expected output: it enter to screensaver and turn off backlight, then press any
key to resume system, it should shows GDM.

This only happens on Haswell chipset, but it is OK on Ivybridge.
Kernel 3.7.0 added intel 3.7.0 branch kernel patch
Xorg1.12.0
Model: Lenovo Y410 Y510

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