Here's the output from dmesg:

fglrx: module license 'Proprietary. (C) 2002 - ATI Technologies, Starnberg, GERM
ANY' taints kernel.
[fglrx] Maximum main memory to use for locked dma buffers: 1776 MBytes.
[fglrx] ASYNCIO init succeed!
[fglrx] PAT is enabled successfully!
[fglrx] module loaded - fglrx 8.43.2 [Nov 9 2007] on minor 0
ACPI: PCI Interrupt 0000:01:05.0[A] -> GSI 17 (level, low) -> IRQ 19
[fglrx] GART Table is not in FRAME_BUFFER range
[fglrx] Reserve Block - 0 offset = 0X0 length = 0X40000
[fglrx] Reserve Block - 1 offset = 0X203f5000 length = 0Xb000
(END)

Here's the output from /var/log/X11.0.log

[EE] flgrx(0): Failed to enable interrupts.
[II] flgrx(0): DRI initialization successfully!