Red Hat Bugzilla – Bug 465189
uvcvideo fails to resume
Last modified: 2009-12-18 01:28:36 EST
Description of problem:
If I suspend to disk and resume, I get the following dmesg entries:
hub 1-0:1.0: port 1 status 0000.0100 after resume, -19
usb 1-1: can't resume, status -19
hub 1-0:1.0: logical disconnect on port 1
pm_op(): usb_dev_restore+0x0/0x10 returns -19
PM: Device 1-1 failed to restore: error -19
ehci_hcd 0000:00:1a.7: devpath 6 ep0out 3strikes
uvcvideo: Failed to query (1) UVC control 2 (unit 0) : -71 (exp. 26).
uvcvideo 1-6:1.1: resume error -5
PM: Image restored successfully.
Restarting tasks ... <7>hub 1-0:1.0: state 7 ports 6 chg 0002 evt 0002
hub 1-0:1.0: port 1, status 0100, change 0000, 12 Mb/s
usb 1-1: USB disconnect, address 4
usb 1-1: unregistering device
usb 1-1: usb_disable_device nuking all URBs
usb 1-1: unregistering interface 1-1:1.0
usb 1-1:1.0: uevent
usb 1-1: uevent
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Suspend to disk.
3. No camera device.
Doing an rmmod/modprobe cycle doesn't seem to help.
As much as it is tempting to blame the uvcvideo, looks like the
core failed to resume the port and driver has done what it could
to re-awaken the device.
Bryan, does the camera work afterwards, or it requires physical
unplug-replug to work?
Hi, Pete -
The camera doesn't work afterwards. It's built into the laptop's lid, so I can't do an unplug/replug on it.
A built-in, so I cannot buy it? Just my luck.
Bryan, please do this for me: capture two usbmon traces, one where it's
enumerated normally, and the one across the suspend/resume. There's a
howto in /usr/share/doc/kernel-doc-2.6.27/Documentation/usb/usbmon.txt.
For the first run, find out what bus the cam is on (e.g. ehci or
or uhci/ohci) by looking at /proc/bus/usb/devices (come to think of
it, attach it to the bug for the reference, please). I expect it
to be ehci. If so, run rmmod uhci_hcd; rmmod ohci_hcd -- this will
prevent both hw and sw fallback from confusing us. Then, start
cat /sys/kernel/debug/usbmon/0u > xxx1. Run rmmod ehci_hcd &&
modprobe ehci_hcd. Wait for the camera to come up (it does, right?),
kill the cat. Save the trace.
If it does not come up, we have our case and suspend/resume was
a red herring. Do not proceed.
For the second run, start cat as before, only >xxx2. Suspend, resume,
kill the cat, save the trace. Verify that the camera is dead.
Also, please save the complete dmesg without edits.
I'll read the traces and try to find what we do differently for
Bryan, please let me know if this kind of debugging is too onerous for you.
I may be able to cobble together a test platform by buying a uvc-compatible
webcam. Keep in mind though, such things commonly fail to reproduce with
a slightest deviation.
It should be doable, but I just had a hand operation today so it will be a few days before I can do anything.
This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle.
Changing version to '10'.
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