[Bug 95200] IOQuake is jerky

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95200

--- Comment #15 from Sitsofe Wheeler <sitsofe at yahoo.com> ---
The patch from comment #14 (which can be found in
https://lists.x.org/archives/xorg-commit/2016-April/039124.html or on
https://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=e4ef6e9e5b2c8b637356621c60b28d064d40d29c
) alone resolves the issue.

The patch from comment #13 alone doesn't resolve the problem (stuttering still
occurs) and introduces a failure after ioquake is quit where the old resolution
isn't restored and instead an error message is printed:

X Error of failed request:  BadValue (integer parameter out of range for
operation)
  Major opcode of failed request:  151 (XFree86-VidModeExtension)
  Minor opcode of failed request:  10 (XF86VidModeSwitchToMode)
  Value in failed request:  0x300000e
  Serial number of failed request:  192
  Current serial number in output stream:  194

Further, I've just noticed that when running without any patches and doing
xrand -s 800x600 before starting ioquake then using timedemo 1 when playing
back a demo only yields 33fps. This is lower than the 43fps seen when starting
in 1024x600 and letting ioquake do the switching to 800x600.

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