I guess even with a single display, multi-threaded apps like the web
browser could still trigger this nouveau crash or similar by rendering
from multiple threads.
There's a comment here suggesting the same crash might also happen in some
processes like webbrowser-app even under Unity7:
** Changed in: mesa (Ubuntu)
Status: Confirmed => Invalid
** Also affects: nouveau via
https://bugs.freedesktop.org/show_bug.cgi?id=92438
Importance: Unknown
Status: Unknown
** Changed in: mir (Ubuntu)
Importance: Undecided => Critical
** Changed in: qtmir (Ubuntu)
** Changed in: canonical-devices-system-image
Importance: High => Critical
** Changed in: libdrm (Ubuntu)
Importance: High => Critical
** Changed in: mesa (Ubuntu)
Importance: High => Critical
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** Summary changed:
- Mir crashes on nouveau (nv50) in pushbuf_kref()
+ Mir crashes on nouveau (nv50) in pushbuf_kref() especially with multiple
monitors
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