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Also, you can never have enough vram. LOTS of pixamps get stored in vram (especially when running a compositor), so you are probably using more than you think.
I wouldn't want to swap to VRAM on a card I was also using for graphics - in addition to the issues related to sharing VRAM you would also be sharing BAR address space, which might be an even bigger problem.
I guess swapping to an unused graphics card would still be OK but not sure whether the driver would set things up properly if there was no display attached.
Nice to see that after 2 years your problem is solved So, this has been a problem ever since Fedora 10 up to now?
Well, this was a new feature essentially. Without KMS and memory manager, you can't address beyond PCI BAR address (256MB). With memory manager now in place, it works fine.
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