[Bug 86951] New: [GM45][3.17/3.18] drm:intel_pipe_config_compare (underrun errors)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86951

            Bug ID: 86951
           Summary: [GM45][3.17/3.18] drm:intel_pipe_config_compare
                    (underrun errors)
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: shawn.starr at rogers.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Kernels 3.17.x/3.18.0-0.rcX.git0.1.fc22.x86_64
Mesa git master (10.5)
DDX: xorg-x11-drv-intel-2.99.916-3.20141117.fc21.x86_64

Using the Intel GM 45 chipset, any 3D rendering is frozen (rendering
offscreen). I don't know when this broke

[   45.601062] [drm:intel_pipe_config_compare] *ERROR* mismatch in pipe_src_w
(expected 0, found 4096)
[   45.609659] [drm:i965_irq_handler] *ERROR* pipe A underrun
[   45.616178] [drm:intel_pipe_config_compare] *ERROR* mismatch in pipe_src_w
(expected 0, found 4096)
[   45.902070] [drm:i9xx_check_fifo_underruns] *ERROR* pipe A underrun
[   45.903073] [drm:i965_irq_handler] *ERROR* pipe A underrun

OpenGL renderer string: Mesa DRI Mobile Intel® GM45 Express Chipset 
OpenGL version string: 2.1 Mesa 10.5.0-devel (git-4aec928)

running glxgears shows output that it is rendering frames but the glxgears
window itself is frozen, same with any GL game, frozen on startup (rendering
offscreen).

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