Bug 79716

Summary: [regression] i915_enable_fbc != 0 for HD Graphics 5000
Product: DRI Reporter: Jon Kristensen <info>
Component: DRM/IntelAssignee: Imre Deak <imre.deak>
Status: CLOSED FIXED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: intel-gfx-bugs
Version: XOrg git   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description Jon Kristensen 2014-06-06 09:35:59 UTC 
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.
Comment 2 Jani Nikula 2014-06-10 16:46:06 UTC 
commit 1f1a3fdf410dc35560d32c23eae307dce04f566e
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Fri Jun 6 10:37:11 2014 +0100

    drm/i915: Disable FBC by default also on Haswell and later

Thanks for the report and testing.
Comment 3 Daniel Vetter 2014-06-18 14:07:56 UTC 
Mark as regression for stats.

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.