On 06/16/2009 09:21 AM, James Bottomley wrote:
On Tue, 2009-06-16 at 17:03 +0200, Marc Bowes wrote:
Sorry to bother, but this is really bugging me! I can't seem to find anybody
else with the same problem. What steps should I be taking to figure this
out? I'm thinking I should be trying other kernel versions and/or plugging
drives in different places. I don't think the motherboard is faulty, and I
seem to be getting good speeds (~70mbs) to all four drives.
Well, those are on the AHCI built in controller. The one with the slow
response is the empty JMicron 20360/20363. But why this should be so,
I've no idea ... it looks like the AHCI driver can't tell the phys are
empty for some reason, which could be due to many things.
I would suspect it's a hardware problem that we can't do much about..
For some reason the controller is reporting the SATA link is online at
3Gbps when there's actually nothing connected. We try to repeatedly
reset the "device" as it doesn't respond properly, until we finally give up.
Can you disable that JMicron controller in the BIOS somehow?
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