*** This bug is a duplicate of bug 525517 ***
    https://bugs.launchpad.net/bugs/525517

For the record, I wasn't quite right on the display plane A/B issue. It
was 0x00000010 and 0x00000100 that are that pair ("Invalid GTT Entry
during Display A Fetch" and "Invalid GTT Entry during Display B Fetch").
0x00000001 means "Invalid GTT Entry during Fetch on behalf of the Host"
which is still pretty similar. This information is available in section
8.2.1.2 in http://intellinuxgraphics.org/VOL_1_graphics_core.pdf .

-- 
[i915gm] GPU lockup 4e55afd6915bf5224263b79e5550b6a4
https://bugs.launchpad.net/bugs/535454
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