I'm starting to wonder if there is another separate driver problem hampering the RS690 chipset. You did mention that your CPU wasn't being pinned high anymore. I think that is the main fix that this patch brings, but my chipset is RS482 Xpress 200M, so it may be a different problem as well. If you had fglrx drivers installed previously did you run the command:
sudo apt-get remove --purge xorg-driver-fglrx
In order to make the new drivers function normally the proprietary drivers need to be purged out first.
I'm starting to wonder if there is another separate driver problem hampering the RS690 chipset. You did mention that your CPU wasn't being pinned high anymore. I think that is the main fix that this patch brings, but my chipset is RS482 Xpress 200M, so it may be a different problem as well. If you had fglrx drivers installed previously did you run the command:
sudo apt-get remove --purge xorg-driver-fglrx
In order to make the new drivers function normally the proprietary drivers need to be purged out first.