I've also seen this on syslog;
kernel: [58920.005889] [fglrx:fireglAsyncioIntDisableMsgHandler] *ERROR* IRQMGR returned error 1 when trying to disable interrupt source ff000066
I've also seen this on syslog;
kernel: [58920.005889] [fglrx: fireglAsyncioIn tDisableMsgHand ler] *ERROR* IRQMGR returned error 1 when trying to disable interrupt source ff000066