Comment 5 for bug 974830

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Bryce Harrington (bryce) wrote : Re: [sandybridge-m-gt2+] GPU lockup render.IPEHR: 0x78170003

Also I suspect the lockup with external monitor plugging may be a separate issue than the gpu lockup. You might try using netconsole to see if you can get the dmesg output for that, and then file a new bug report.