[Bug 79716] New: i915_enable_fbc != 0 for HD Graphics 5000

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79716

          Priority: medium
            Bug ID: 79716
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: i915_enable_fbc != 0 for HD Graphics 5000
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: info at jonkri.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Using the Debian Unstable and Experimental versions of xserver-xorg-video-intel
(2:2.21.15-2+b1 and 2:2.99.911+git20140529-1~exp2, respectively), the driver
does not set i915_enable_fbc=0 for HD Graphics 5000.

By default, the X session can only be displayed for less than one second at the
time. By switching away from X (Ctrl+Alt+F1), and then back (Ctrl+Alt+F7), I
can see a working X session for less than a second.

Setting i915_enable_fbc to 0 seems to allow for normal X use.

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