[Bug 71391] New: GM45: Regression due to incorrect graphics base of stolen memory.

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=71391

            Bug ID: 71391
           Summary: GM45: Regression due to incorrect graphics base of
                    stolen memory.
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.14
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: paran at lysator.liu.se
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: Yes

In kernel v3.12 and later render cache flushing is broken on CRTC 0 on
my Lenovo x200s, with GM45 graphics. A bisect show that the first bad
commit is:

commit 17fec8a08698bcab98788e1e89f5b8e7502ababd
Author: Chris Wilson <chris at chris-wilson.co.uk>

    drm/i915: Use Graphics Base of Stolen Memory on all gen3+


Bad kernel versions (all have the above commit):
v3.12.0, v3.12.13, v3.13.0, 3.13.5, 3.14.0-rc4+(d8efcf)

Good kernel versions:
v3.11.0, v3.11.10
v3.13.5 with 17fec8 reverted.


I get the exact same symtops that I had one year ago in bug
53541. Your diagnose based on the symptoms that time was "Lack of
render cache flushing". That bug was in 3.6, got fixed in 3.9 and the
fix had to do with the base of stolen memory that time as well:

commit e12a2d53ae45a69aea499b64f75e7222cca0f12f
Author: Chris Wilson <chris at chris-wilson.co.uk>

    drm/i915: Fix detection of base of stolen memory

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