Hey I have the same laptop as you, did you ever find an answer? My BIOS doesn't have anyting about graphics memory at all
I hope you can increase the memory, since it's only 128mb it can't play... well anythig at a reasonable frame rate. And they have the audacity to call this a gaming laptop?! hahaha
Right now, the best way to go in this scenario where a laptop is used, would be to contact the manufacturer of the device.
There is a chance they also have a forum like this, in which you could post your inquiry.
They are the ones that designed and integrated your device, which would be my reasoning to advise you to contact them directly.