[Nouveau] [Bug 100760] Rapid flickering when an app is placed on the second Nouveau ZaphodHeads display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100760

--- Comment #5 from mrj at advancedcontrols.com.au ---
Thanks Ilia. I haven't done the ssh test yet, but I've got further data on the
problem:

Under Nouveau my computer started crashing about once a day. (The screens
suddenly go black, and trying to play audio from a known open terminal fails,
so X was probably crashing, and a hardware reset is required, after which the
logs often showed Cron processes doing stuff after the crash, so the Kernel
wasn't crashing.)

A 304xx proprietary Nvidia driver that works on the latest X had since been
released, so I tried that.

Results:

1. My computer is no longer crashing. A potential cause of the crashes under
Nouveau is high GPU idle usage -- the GPU temp is permanently at least 20
degrees C lower under the proprietary driver. My card is a mid-range card with
extensive passive cooling, so fan speed control by Nouveau is no help.

https://forums.opensuse.org/showthread.php/456958-Nouveau-driver-and-GPU-temperature
http://www.phoronix.com/scan.php?page=article&item=nouveau_comp_2011&num=19
https://forums.gentoo.org/viewtopic-t-837855-start-0.html

2. The proprietary driver has "Separate X Screen" and "TwinView" modes.
"Separate X Screen" was what I had been using, and this no longer works on the
latest X (the second screen is black, only the pointer appears). So, as
suspected, the loss of "Zaphod" is an X issue rather than a Nouveau issue.
There's no flickering in Mate however, so this _is_ a Nouveau issue.

So I'm currently using TwinView, which is the same as the XRandR Nouveau mode.
I'm still adapting to the loss of separate sets of virtual desktops.

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