[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 #4 from Andy Lutomirski <luto at mit.edu> ---
Just for completeness: the bug is present in 4.5 final.

I've definitely seen FIFO overruns while the first two WM levels show the
cursor being on (PLANE_WM_EN set).  I've never seen PLANE_WM_EN set beyond the
second level (LP0 and LP1 if I understand the code correctly).

I tend to have a gnome-terminal running, and gnome-terminal loves toggling the
cursor state, but I certainly don't need to have gnome-terminal in the
foreground to see this issue.

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