libata Promise driver regression 2.6.5->2.6.6

G'day all,

I have been using 2.6.5 happily for a while now on this machine. It's an Asus A7V600 with 3 Promise SATA150-TX4 SATA cards.

With 2.6.6 (and 2.6.6-bk3) it hangs with a dma timeout on boot detecting the 9th sata drive (there are 10). I left it for about 10 minutes to see if anything else transpired but it just sat there. I'm on a serial console to this machine at the moment and I could not get it to respond to the magic sysrq key over serial either.

I have placed all relevant info including a capture of 2.6.5 boot and 2.6.6 boot, plus all requested info from linux/REPORTING-BUGS on my webpage

Normal working dmesg
http://www.wasp.net.au/~brad/2.6.5.log

Hung up dmesg
http://www.wasp.net.au/~brad/2.6.6.log

.config and all other info I could gather.
http://www.wasp.net.au/~brad/2.6.6.config
Much as I'd love to be subscribed, I just can't keep up with the volume so please cc: me. Willing to try patches/hacks/suggestions

Actually, while I'm here I just connected 2 sata drives to the onboard via sata ports and 2.6.5 won't detect them. All relevant info is in the logs. insmod sata_via just silently loads and nothing occurs. The onboard raid bios detects the drives fine and I have no raid created or enabled.

Regards,
Brad

Looks like ACPI problems. First, for some reason ACPI in 2.6.6 decided to use PIC mode, while 2.6.5 used IOAPIC mode. Second, IRQ 12 was chosen for the Promise controller which failed; this is a known problem in 2.6.6, the patch at http://bugzilla.kernel.org/show_bug.cgi?id=2665 should fix it.