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1b1ed1a
(Get the code!)
Many computers with 855GM graphics chipset is affected by bug 541511, which will hang the GPU but not bring down the network connection (unless it is managed by the X session). There is an upstream fix for that issue, which has not made it into the mainline kernels yet and there are even references to pre-compiled kernel binaries in the comments that you may try.
You may also try one of the newest mainline builds from [1] (see [2] for information), just in case this is a different problem which has been fixed in a newer kernel.
If the problem persists, I suppose setting up a netconsole [3] may make it possible to get some more information out of the computer when it hangs.
[1]: http://
[2]: https:/
[3]: https:/