[Bug 17085] [GEM i965] DRM fails to map ringbuffer

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=17085





--- Comment #20 from Steven Newbury <s_j...@ya...>  2008-08-19 16:47:25 PST ---
Created an attachment (id=18396)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=18396)
use ioremap_wc() in place of ioremap()

Okay, this works as far as initialisation.  Ringbuffer is allocated and
enabled, though there a some errors during server startup.

dmesg contains:
[drm] Set up GEM GTT of 144896kb
[drm] Creating ringbuffer
[drm:i915_gem_object_pin] *ERROR* pinning object ffff88007bf53180 size 32768: 1

Also the next attached Xorg log, notice "(WW) intel(0): Existing errors found
in hardware state." and "(EE) intel(0): underrun on pipe B!"

Furthermore, attempting to run a glxgears results in the machine hard locking.


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