Comment # 8 on bug 1196805 from Stefan Dirsch

> [    58.628] (--) CHROME(0): Mapping the frame buffer at address 0xA0000000 with size 262144 KB.
> [    58.628] (EE) CHROME(0): Unable to map the frame buffer. Error: Invalid argument (22)

This looks like the same issue as with old "mga" driver. I think there has been
a kernel option to workaround this issue, but I already forgot about which one.
Felix, can you still remember?