I have an ATI Radeon HD 4890 that I am using with Linux Mint 14. I tried installing the proprietary AMD drivers, but it didn't actually fix the problem, so I reverted back to open-source drivers (Gallium). In the AMD CCC menu, however, it showed the full gig. But in the Administration > System Information > Devices > PCI Devices > VGA Compatible Controller, and attached is an image of what it shows.
And there was something going on (I think I was playing Starcraft II but i can't quite remember) that caused an alert to pop up saying I nearly maxed out my VRAM quota at around 228MB.
Is there some number I need to adjust in some file somewhere? Or am I stuck with a card that is only 1/4 as good as it should be?
Thank you for your help! Cheers to an otherwise very awesome distro. Better than Ubuntu and Windows overall.