[Bug 75502] [SNB] Page flips hang indefinitely, apparently waiting for interrupts that never happen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75502

--- Comment #7 from Simon Farnsworth <simon at farnz.org.uk> ---
It's definitely a new problem, and I've just seen it on IVB (i3-3220), too:

 # intel_reg_dumper  | grep DSP
                      DSPACNTR: 0xd8004400 (enabled)
                      DSPABASE: 0x00000000
                    DSPASTRIDE: 0x00001e00 (120)
                      DSPASURF: 0x019c8000
                   DSPATILEOFF: 0x00000000 (0, 0)
                      DSPBCNTR: 0x58004400 (disabled)
                      DSPBBASE: 0x00000000
                    DSPBSTRIDE: 0x00000a00 (40)
                      DSPBSURF: 0x0085b000
                   DSPBTILEOFF: 0x00000000 (0, 0)
                      DSPCCNTR: 0x00004000 (disabled)
                      DSPCBASE: 0x00000000
                    DSPCSTRIDE: 0x00000000 (0)
                      DSPCSURF: 0x00000000
                   DSPCTILEOFF: 0x00000000 (0, 0)
             PCH_DSPCLK_GATE_D: 0x10000000
              PCH_DSP_CHICKEN1: 0xa0000000
              PCH_DSP_CHICKEN2: 0x00000000
              PCH_DSP_CHICKEN3: 0x00000024

 # grep . /sys/kernel/debug/dri/0/i915_gem_pageflip
Flip queued on pipe A (plane A)
Stall check enabled, 1 prepares
Old framebuffer gtt_offset 0x019c8000
New framebuffer gtt_offset 0x011b8000
No flip due on pipe B (plane B)
No flip due on pipe C (plane C)

This looks to me like the flip hasn't happened - DSPASURF is 0x19c8000, which
matches old framebuffer gtt_offset.

Note that the kernel doesn't have either of the patches from this bug on it.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20140228/23eb413a/attachment.html>