[Bug 42920] Radeon with KMS and UMA works only up to 128MB

https://bugzilla.kernel.org/show_bug.cgi?id=42920

--- Comment #5 from Alex Deucher alexdeucher@gmail.com 2012-03-14 15:02:42 --- (In reply to comment #4)

for 256MB, 512MB and 1024MB I get

[ 6.301475] [drm] CONFIG_MEMSIZE: 0xffffffff

also I need a cold restart when changing UMA size in bios, otherwise it's not changed.

so is it a bios problem? should I try to complain to Asus? Is there an easy workaround? Like using manually vramlimit?

Looks like the bios is broken. The vramlimit parameter should work.