I just realized that another performance issue I had is actually caused
by this bug.  This occurs with kernel 3.10.0-229.1.2.el7.centos.plus
(and probably all kernels).  After I suspend/resume scrolling in gnome-
terminal is very slow.  For example if I 'cat /var/log/messages' then
scrolling in gnome-terminal is very jerky.  Likewise scrolling from
within vi or less (/var/log/messages is a good way to test) is also
painfully slow.  Booting with "radeon.dpm=0" also solves this gnome-
terminal scroll problem for me.

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https://bugs.launchpad.net/bugs/1319589

Title:
  [drm:rv770_dpm_set_power_state] *ERROR* rv770_set_sw_state failed

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