I have a similar problem. It occurs occasionally disabling me from
writing to sata disk. Most times it occurs when I plug an USB device.
I'm using an updated version of Lucid: 2.6.32-22-generic-pae #36-Ubuntu
SMP Thu Jun 3 23:14:23 UTC 2010 i686 GNU/Linux
dmesg logs when it occurs:
[ 41.952008] eth2: no IPv6 routers present
[ 6755.000032] ata4: lost interrupt (Status 0x50)
[ 6786.000039] ata4: lost interrupt (Status 0x51)
[ 6791.000048] ata4.00: qc timeout (cmd 0xa0)
[ 6791.000063] ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[ 6791.000070] sr 3:0:0:0: CDB: Test Unit Ready: 00 00 00 00 00 00
[ 6791.000086] ata4.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
[ 6791.000088] res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x5
(timeout)
[ 6791.000096] ata4.00: status: { DRDY ERR }
[ 6791.000124] ata4: soft resetting link
[ 6791.164366] ata4: nv_mode_filter: 0x739f&0x739f->0x739f, BIOS=0x7000
(0xc000) ACPI=0x701f (60:600:0x13)
[ 6791.180285] ata4.00: configured for UDMA/33
[ 6796.180030] ata4.00: qc timeout (cmd 0xa0)
[ 6796.180038] ata4.00: TEST_UNIT_READY failed (err_mask=0x5)
[ 6796.180064] ata4: soft resetting link
[ 6796.345243] ata4: nv_mode_filter: 0x739f&0x739f->0x739f, BIOS=0x7000
(0xc000) ACPI=0x701f (60:600:0x13)
[ 6796.360293] ata4.00: configured for UDMA/33
[ 6801.360034] ata4.00: qc timeout (cmd 0xa0)
[ 6801.360040] ata4.00: TEST_UNIT_READY failed (err_mask=0x5)
[ 6801.360044] ata4.00: limiting speed to UDMA/33:PIO3
[ 6801.360065] ata4: soft resetting link
[ 6801.524391] ata4: nv_mode_filter: 0x738f&0x739f->0x738f, BIOS=0x7000
(0xc000) ACPI=0x701f (60:600:0x13)
[ 6801.540294] ata4.00: configured for UDMA/33
[ 6806.540028] ata4.00: qc timeout (cmd 0xa0)
[ 6806.540036] ata4.00: TEST_UNIT_READY failed (err_mask=0x5)
[ 6806.540040] ata4.00: disabled
[ 6806.540075] ata4: soft resetting link
[ 6806.696082] ata4: EH complete
--
Lost ata interrupt, usb hid (mouse keyboard) freezes
https://bugs.launchpad.net/bugs/576496
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