Are you actually noticing problems with your GPU, other than these error messages?
If you aren't actually noticing problems with your GPU other than these error messages I'd say you can safely ignore them. Most probably it's related to a known bug affecting Apport:
Bug #1005573
If you are seeing any weird graphics related behavior, keep an eye on your logs - specifically
xorg.0.log and
syslog, but maybe the kernel logs as well. If you are noticing errors copy them down, and try to make a best guess (or ask) whether it is a driver problem, kernel problem or X11 problem. Then use apport to file the bug against what you determine to be the best package (for example for a nvidia driver I would enter apport-bug nvidia-current-updates), be as detailed as you can be in the resulting bug report and put the symptoms you experience and any errors you noticed into the description when you file the bug. More information about filing bugs is
here and
here.
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