Hi, Tejun, the motherboard is a Gigabyte EP45-DQ6. Attached are dmidecode and a new dmesg.txt, as I have enabled AHCI mode. Robert, 0a:00.0 SATA controller: JMicron Technologies, Inc. JMicron 20360/20363 AHCI Controller (rev 02) 0a:00.1 IDE interface: JMicron Technologies, Inc. JMicron 20360/20363 AHCI Controller (rev 02) Those are the two JMicron controllers I have. I assume you mean the SATA one. The AHCI controller is: 00:1f.2 SATA controller: Intel Corporation 82801JI (ICH10 Family) SATA AHCI Controller I'm not sure if just that controller will be sufficient? Anyways, I will experiment. Thanks On Fri, Jun 19, 2009 at 6:00 AM, Tejun Heo<htejun@xxxxxxxxx> wrote: > Robert Hancock wrote: >> 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? > > It could be some storage controller hanging off there. Some revisions > of SIMG PMPs operating in raid mode keep the link online while failing > to respond to reset if the downstream ports are empty. Marc, which > motherboard are you using? Can you please post the output of > dmidecode? > > Thanks. > > -- > tejun > -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
