For what it's worth, 3.0.0-14.23 and 3.0.13-030013.201112091235 (from the mainline "PPA") both fix the problem on my machine.
lspci -nn excerpt: 00:00.0 Host bridge [0600]: Advanced Micro Devices [AMD] RS780 Host Bridge [1022:9600] 00:02.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (ext gfx port 0) [1022:9603] 00:06.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE port 2) [1022:9606] 00:14.0 SMBus [0c05]: ATI Technologies Inc SBx00 SMBus Controller [1002:4385] (rev 3a) 00:14.2 Audio device [0403]: ATI Technologies Inc SBx00 Azalia (Intel HDA) [1002:4383] 00:14.3 ISA bridge [0601]: ATI Technologies Inc SB7x0/SB8x0/SB9x0 LPC host controller [1002:439d] 00:14.4 PCI bridge [0604]: ATI Technologies Inc SBx00 PCI to PCI Bridge [1002:4384] 01:00.0 VGA compatible controller [0300]: ATI Technologies Inc RV790 [Radeon HD 4890] [1002:9460] 01:00.1 Audio device [0403]: ATI Technologies Inc HD48x0 audio [1002:aa30] -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/855199 Title: "irqfixup" and "irqpoll" broken since 2.6.39 To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/855199/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
