Re: USB device losing power

> On Thu, 11 Jan 2007, Jon Smirl wrote:
>
[...]
>
> Here we see a resume that failed.  The key indicator is the 0x1000 bit in
> the portsc value; it means the port is still suspended even after it was
> supposed to have resumed.  This is the Intel hardware-resume bug I
> described earlier.  I have seen it on a few occasions but I cannot
> duplicate it reproducibly.  If you can, your system would make a good test
> case.  Try applying the diagnostic patch below and see what happens.
>
> When this sort of error occurs, the USB core resets the device and
> re-enumerates it.
>
> > hub 3-0:1.0: port 2 status 0004.0107 after resume, 0
> > hub 3-0:1.0: logical disconnect on port 2
> > usb 3-2: can't resume, status -19
>
> This shows the core realizing that the resume failed.
>

I've been experiencing a similar resume failure on my fingerprint
reader (on a Thinkpad T60) and I can reproduce it easily. I applied
your diagnostic patch on a 2.6.20 tree and this is what I got on
syslog. Please let me know if this is of any help and if there's
anything else I could do to help further debugging.

Feb 12 22:51:30 frida kernel: [ 3529.760000] usb usb5: usb auto-resume
Feb 12 22:51:30 frida kernel: [ 3529.760000] usb usb5: finish resume
Feb 12 22:51:30 frida kernel: [ 3529.760000] hub 5-0:1.0: hub_resume
Feb 12 22:51:30 frida kernel: [ 3529.760000] usb usb5: wakeup_rh
Feb 12 22:51:30 frida kernel: [ 3529.800000] hub 5-0:1.0: state 7
ports 2 chg 0000 evt 0000
Feb 12 22:51:30 frida kernel: [ 3529.800000] usb 5-2: usb auto-resume
Feb 12 22:51:30 frida kernel: [ 3529.832000] uhci_hcd 0000:00:1d.3:
port 2 resume iterations 0:0
Feb 12 22:51:30 frida kernel: [ 3529.832000] uhci_hcd 0000:00:1d.3:
port 2 portsc 1095,01
Feb 12 22:51:30 frida kernel: [ 3529.832000] hub 5-0:1.0: port 2
status 0004.0107 after resume, 0
Feb 12 22:51:30 frida kernel: [ 3529.832000] hub 5-0:1.0: logical
disconnect on port 2
Feb 12 22:51:30 frida kernel: [ 3529.832000] usb 5-2: can't resume, status -19
Feb 12 22:51:30 frida kernel: [ 3529.832000] hub 5-0:1.0: state 7
ports 2 chg 0004 evt 0000
Feb 12 22:51:30 frida kernel: [ 3529.832000] uhci_hcd 0000:00:1d.3:
port 2 portsc 0091,01

Cheers,
Guilherme

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