[Bug 96469] New: [BDW]: linux 4.6.2: mode switch is not reliable, gnome-shell sometimes hangs on mode switch

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96469

            Bug ID: 96469
           Summary: [BDW]: linux 4.6.2: mode switch is not reliable,
                    gnome-shell sometimes hangs on mode switch
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: anarsoul at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

After upgrade to linux-4.6.2 modeswitch using xrandr is very unreliable.
Gnome-shell can hang right after using xrandr. Nothing suspicious in journal,
it hangs after:

Jun 09 17:19:32 vasilykh-thinkpad-x1 /usr/lib/gdm/gdm-x-session[563]: (II)
intel(0): resizing framebuffer to 4480x1440
Jun 09 17:19:32 vasilykh-thinkpad-x1 /usr/lib/gdm/gdm-x-session[563]: (II)
intel(0): switch to mode 2560x1440 at 60.0 on DP2-2 using pipe 0, position (1920,
0), rotation normal, reflection none
Jun 09 17:19:32 vasilykh-thinkpad-x1 kernel: [drm] Reducing the compressed
framebuffer size. This may lead to less power savings than a non-reduced-size.
Try to increase stolen memory size if available in BIOS

Hardware is Thinkpad X1 Carbon 3rd gen, Broadwell graphics. External monitor is
connected using OneLink dock.

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