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[Clayton <cstanley@xxxxxxxxxxxxxxxxxx>]

I saw this issue with an Asus p5q-deluxe motherboard, Intel E8400 Core 2
Duo processor, and Ubuntu 14.04.1 (Nov 1, 2014). The computer would
freeze on average once per day (usb inputs would no longer work, screen
frozen, no way to recover, etc.). After disabling C1E in the BIOS, the
issue was resolved. I waited about 14 days to make sure that the change
actually fixed the problem. It did.

During the process of troubleshooting, I switched out the video card
(this motherboard does not have onboard video). The problem occurred
both before and after the swap, so further evidence that the issue is an
interaction with the p5q motherboard, 8400 CPU, C1E, and Ubuntu.

Not sure if this is worth looking into anymore since the motherboard is
relatively old and is probably not still being used too much. But
thankfully this thread from 2008-2009 was here. Otherwise I never would
have found the workaround.

-- 
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https://bugs.launchpad.net/bugs/260639

Title:
  Freeze on mobo P5Q and C1E enabled

Status in “linux” package in Ubuntu:
  Fix Released

Bug description:
  My system is E8400, mainboard Asus P5Q.

  If I leave C1E cpu feature enabled the system freezes every 2 minutes.
  C1E is enabled by default!

  With C1E disabled Intrepid Ibex works well.

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