[coreboot] About the USB issue on the Lenovo T420 port

Nicolas Reinecke nr at das-labor.org
Tue Oct 6 16:00:33 CEST 2015

can you send me a RCBA dump with vendor bios, coreboot after boot and
util/inteltool/inteltool -r
Nicolas Reinecke
Am Montag, den 05.10.2015, 21:49 +0800 schrieb Iru Cai:
> Hi,
> I'm using the new Lenovo T420 port on gerrit[1] and found a bug about
> USB(in my post on the gerrit page). And just now I found a work
> around on this issue.
> First I tested a USB disk on the buggy USB port before suspending the
> system, it works fine. Then I unplugged the USB disk, suspended my
> system, resume, and replugged the disk, the bug occurred. Then I
> unplugged the disk, reload the ehci_pci module as follows:
> rmmod ehci_pci
> modprobe ehci-pci
> The I plugged in the USB disk, it worked fine again.
> I think the kernel message[2] gives some information about it,
> because it gives two different port number on the USB device. But I
> know almost nothing about USB, so I'm not sure what's happening.
> [1] http://review.coreboot.org/#/c/11765/
> [2] see the attached dmesg.log
> Iru Cai
> -- 
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