Comment 21 for bug 164589

@albech:

I have the same card and the same symptoms, especially with the firefox scrolling, but the workaround works for me.

Depending on the driver you're using, or if you installed it with envy or the restricted drivers manager, you need either "nvidia" or "nvidia_new" as the driver name in nvidia-kernel-nkc. I think adding them both is okay too. This turns off GPU frequency scaling on AC, so will only (hopefully) stop the blinks while on AC power. Use 0x2222 to stop gpu scaling all the time (but use more power on batteries).