[Bug 49603] [regression] Fullscreen video no longer smooth with GPU in low power mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49603

--- Comment #5 from Simon Farnsworth <simon.farnsworth at onelan.co.uk> 2012-05-09 02:30:15 PDT ---
Created attachment 61271
  --> https://bugs.freedesktop.org/attachment.cgi?id=61271
A program to stop the CPU entering low power states

Trying a different route. Can you compile the attached program with "gcc -o
stopsleep stopsleep.c" and leave it running while playing a video? It tells the
kernel to avoid using deep sleep states when idling.

If it helps, we have a clue. If it doesn't, and video decode doesn't saturate
all your CPU cores, can you try running "while true ; do true ; done" in a
background shell and see if that helps?

The goal of both of these is to see if the problem is that we're now letting
the CPU idle more than we used to, and finding that the resulting power save
modes hurt.

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