https://bugs.freedesktop.org/show_bug.cgi?id=60879
--- Comment #130 from John Bridgman john.bridgman@amd.com --- madmalkav, your dmesg log had messages from the fglrx kernel driver... not saying that *is* your problem but it definitely can't help... any chance you can test on a vanilla system that hasn't had fglrx installed ?
[ 9.614226] <6>[fglrx] Maximum main memory to use for locked dma buffers: 7714 MBytes. [ 9.614510] <6>[fglrx] vendor: 1002 device: 679e revision: 0 count: 1 [ 9.615005] <6>[fglrx] ioport: bar 4, base 0xe000, size: 0x100 [ 9.615248] <6>[fglrx] Kernel PAT support is enabled [ 9.615263] <6>[fglrx] module loaded - fglrx 15.20.3 [Sep 8 2015] with 1 minors