Comment 2 for bug 761143

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Bryce Harrington (bryce) wrote : Re: GPU lockup (ESR: 0x00000001 IPEHR: 0x02000011) Right after reboot and login into Unity session an error message is appeared

You said there are no visible effects; this error typically comes after your system has frozen - have you seen that kind of problem?

If you can reproduce this easily, please try the X driver in this PPA, which has a workaround that might lessen the issue:
https://launchpad.net/~bryce/+archive/fig