Summary/wrap-up report:  After above changes, the X server took 8 tries
to come up, each time hanging when it went to paint the lightdm pane.
Each try took about 3 minutes (almost 1/2 hour elapsed), after which
some failsafe tries to restart X.  Each try is corellated with the
"failed to idle channel"  messages and/or the DMA_PUSHER errors.  The
8th time it suceeded; at which point I was able to log in and use X as
normal.   There have been no further X disruptions after that point: the
problem, whatever it is, is transient.  (I have not yet tried to watch
any youtube videos, though...)  BTW, the 5th attempt Xorg.5.log file is
filled with dozens of "[mi] EQ overflowing.  Additional events will be
discarded" error messages, and dozens of corresponding stack traces.
None of the other failed attempts have this.

Since this is the very latest linux kernel, and what appears to be the
latest libdrm, I'll try to pursue this with the kernel devs directly.
The above report is an FYI for anyone else enountering this issue, since
this bug is the #1 hit that google currently provides for these error
messages, and its the ONLY bug that provides real, actionable
information on how to resolve the issue. (i.e. simply marking this bug
as invalid and telling everyone to take a flying leap doesn't actually
decrease the relevance of the bug report for real-world users).

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https://bugs.launchpad.net/bugs/1097178

Title:
  nouveau failed to idle channel 0xcccc0000

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