[Bug 94337] Linux 4.5 regression: FIFO underruns on Skylake

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94337

--- Comment #5 from Andy Lutomirski <luto at mit.edu> ---
I have not reproduced this problem in 4.6-rc1, so it might be fixed.

If I had to guess, I'd say this was:

commit bf22045250fafbe733277e13300eaa240ba2104d
Author: Matt Roper <matthew.d.roper at intel.com>
Date:   Tue Jan 19 11:43:04 2016 -0800

    Revert "drm/i915: Add two-stage ILK-style watermark programming (v10)"

which is the fix for bug 93640.

I think there is something wrong with your release process.  v4.5 has:

commit e2e407dc093f530b771ee8bf8fe1be41e3cea8b3
Author:     Matt Roper <matthew.d.roper at intel.com>
AuthorDate: Mon Feb 8 11:05:28 2016 -0800
Commit:     Jani Nikula <jani.nikula at intel.com>
CommitDate: Tue Feb 9 11:24:39 2016 +0200

    drm/i915: Pretend cursor is always on for ILK-style WM calculations (v2)

v4.6-rc1 also has:

commit b2435692dbb709d4c8ff3b2f2815c9b8423b72bb
Author:     Matt Roper <matthew.d.roper at intel.com>
AuthorDate: Tue Feb 2 22:06:51 2016 -0800
Commit:     Matt Roper <matthew.d.roper at intel.com>
CommitDate: Wed Feb 3 05:59:03 2016 -0800

    drm/i915: Pretend cursor is always on for ILK-style WM calculations (v2)

What gives?  (I haven't confirmed that the latter is the change that fixes
this.)

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