Comment # 1 on bug 954164 from Ian Scott

More:

dmesg |grep rt2800pci 
[    9.741623] rt2800pci 0000:02:05.0: enabling device (1814 -> 1816)
[    9.741642] rt2800pci 0000:02:05.0: cache line size of 64 is not supported
[    9.741708] rt2800pci 0000:02:05.1: enabling device (1814 -> 1816)
[    9.741721] rt2800pci 0000:02:05.1: cache line size of 64 is not supported
[    9.741752] rt2800pci 0000:02:05.2: enabling device (1814 -> 1816)
[    9.741764] rt2800pci 0000:02:05.2: cache line size of 64 is not supported
[    9.741808] rt2800pci 0000:02:05.3: enabling device (1814 -> 1816)
[    9.741820] rt2800pci 0000:02:05.3: cache line size of 64 is not supported
[    9.741851] rt2800pci 0000:02:05.4: enabling device (1814 -> 1816)
[    9.741864] rt2800pci 0000:02:05.4: cache line size of 64 is not supported
[    9.741893] rt2800pci 0000:02:05.5: enabling device (1814 -> 1816)
[    9.741905] rt2800pci 0000:02:05.5: cache line size of 64 is not supported
[    9.741935] rt2800pci 0000:02:05.6: enabling device (1814 -> 1816)
[    9.741948] rt2800pci 0000:02:05.6: cache line size of 64 is not supported
[    9.741977] rt2800pci 0000:02:05.7: enabling device (1814 -> 1816)
[    9.741990] rt2800pci 0000:02:05.7: cache line size of 64 is not supported