[Bug 97260] [bisected] R9 290 low performance in Linux 4.7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97260

--- Comment #19 from Michel Dänzer <michel at daenzer.net> ---
BTW, there are some potential workarounds:

* Disable DRI3 for affected games with the environment variable
  LIBGL_DRI3_DISABLE=1

* Enable sync-to-vblank in affected applications, or force it with
vblank_mode=3

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