Comment 35 for bug 1384342

Thanks Christopher. It looks like only 3.18-rc2 is available for utopic at this stage: http://kernel.ubuntu.com/~kernel-ppa/mainline/ Is that worth trying, or should I wait for a newer one to become available?

With respect to regression, this is definitely worse on utopic than it was on trusty: Symptoms are that all X applications become unresponsive to mouse, keyboard becomes unresponsive. Mouse pointer still works, but is confined to screen 0 (it won't move onto the external monitor).

On trusty, if I just let it sit there, it would come good after about 30-120 seconds. On utopic, if I don't manually intervene and switch to a text console and back, it never comes back (at least not in the 12 minutes that I waited last time). Switching to a text console and back works extremely slowly, but eventually does the right thing, and everything continues on.

Other symptoms are out of order messages in /var/log/syslog (like, 5 minutes out of order), and no kernel oops until I switch VCs.
Here's the oops that does occur eventually: https://pastebin.canonical.com/121261/