That forum post pointed out that there is a problem in the driver and not in the hardware
"The reason is not because of a lack of shaders (there is a workaround in the Workaraounds plugin that fixes this), but rather the Mesa drivers do not have an extension required for cropping the blur region properly (or at least it doesn't work. The driver is effectively kicked into software rendering when you try and enable the blur plugin, not a good idea...)"
That forum post pointed out that there is a problem in the driver and not in the hardware
"The reason is not because of a lack of shaders (there is a workaround in the Workaraounds plugin that fixes this), but rather the Mesa drivers do not have an extension required for cropping the blur region properly (or at least it doesn't work. The driver is effectively kicked into software rendering when you try and enable the blur plugin, not a good idea...)"