I've got the same problem on jaunty with three machines with Via
k9t890/k8m890 chipsets. ATAPI drives will work after boot but sometime
after disappear (after suspend/resume?). It's incredibly annoying to
have to restart the computer to mount a cd, especially given this
problem didn't exist before feisty or there about.
In my case dmesg is full of with:
[32122.240048] ata4.01: qc timeout (cmd 0xa0)
[32122.240070] ata4.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[32122.240087] ata4.01: cmd a0/00:00:00:00:00/00:00:00:00:00/b0 tag 0
[32122.240090] cdb 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[32122.240092] res 51/20:03:00:00:00/00:00:00:00:00/b0 Emask 0x5
(timeout)
[32122.240099] ata4.01: status: { DRDY ERR }
[32122.240133] ata4: soft resetting link
[32122.452422] ata4.00: configured for PIO0
[32122.460580] ata4.01: configured for PIO0
[32122.493603] ata4: EH complete
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LIBATA with PATA_VIA causes ATAPI PATA devices to hang with HPET enabled
https://bugs.launchpad.net/bugs/282536
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