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Old 05-14-2013, 04:25 PM   #1
fmillion
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What are all these USB-related kernel messages?


I have Linux running on a Sony Vaio PictureBook with a Transmeta Crusoe processor.

The syslog is constantly flooded with messages like these:

Code:
May 14 16:21:38 pcg-c1vn kernel: [57149.475222] uhci_hcd 0000:00:07.2: release dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:40 pcg-c1vn kernel: [57151.971841] uhci_hcd 0000:00:07.2: reserve dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:40 pcg-c1vn kernel: [57152.034798] uhci_hcd 0000:00:07.2: release dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:43 pcg-c1vn kernel: [57154.532391] uhci_hcd 0000:00:07.2: reserve dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:43 pcg-c1vn kernel: [57154.594358] uhci_hcd 0000:00:07.2: release dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:45 pcg-c1vn kernel: [57157.090974] uhci_hcd 0000:00:07.2: reserve dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:45 pcg-c1vn kernel: [57157.154001] uhci_hcd 0000:00:07.2: release dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:48 pcg-c1vn kernel: [57159.651546] uhci_hcd 0000:00:07.2: reserve dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:48 pcg-c1vn kernel: [57159.713510] uhci_hcd 0000:00:07.2: release dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:50 pcg-c1vn kernel: [57162.212186] uhci_hcd 0000:00:07.2: reserve dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:50 pcg-c1vn kernel: [57162.273090] uhci_hcd 0000:00:07.2: release dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:53 pcg-c1vn kernel: [57164.771688] uhci_hcd 0000:00:07.2: reserve dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:53 pcg-c1vn kernel: [57164.832719] uhci_hcd 0000:00:07.2: release dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:55 pcg-c1vn kernel: [57167.332270] uhci_hcd 0000:00:07.2: reserve dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:55 pcg-c1vn kernel: [57167.392241] uhci_hcd 0000:00:07.2: release dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:58 pcg-c1vn kernel: [57169.891844] uhci_hcd 0000:00:07.2: reserve dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:21:58 pcg-c1vn kernel: [57169.951792] uhci_hcd 0000:00:07.2: release dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:22:01 pcg-c1vn kernel: [57172.452404] uhci_hcd 0000:00:07.2: reserve dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:22:01 pcg-c1vn kernel: [57172.511384] uhci_hcd 0000:00:07.2: release dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:22:03 pcg-c1vn kernel: [57175.011984] uhci_hcd 0000:00:07.2: reserve dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:22:03 pcg-c1vn kernel: [57175.070931] uhci_hcd 0000:00:07.2: release dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:22:06 pcg-c1vn kernel: [57177.571551] uhci_hcd 0000:00:07.2: reserve dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:22:06 pcg-c1vn kernel: [57177.630533] uhci_hcd 0000:00:07.2: release dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:22:08 pcg-c1vn kernel: [57180.131200] uhci_hcd 0000:00:07.2: reserve dev 3 ep83-INT, period 128, phase 0, 12 us
May 14 16:22:08 pcg-c1vn kernel: [57180.190027] uhci_hcd 0000:00:07.2: release dev 3 ep83-INT, period 128, phase 0, 12 us
As you can see, this runs every few seconds. It's filling up my logs and makes it hard to find more important messages!

Nothing seems amiss with USB itself. I have a USB network adapter and USB flash drive both working without any issues. The internal Memory Stick reader is also a USB-attached device, but I am not using it.

Can someone explain what these messages are? Did I perhaps enable some kernel option that I want to disable and recompile?

Thanks

F

Last edited by fmillion; 05-14-2013 at 04:27 PM.
 
Old 05-15-2013, 09:27 AM   #2
rtmistler
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I'd unplug each USB device and see if these messages stop. For some reason, it's iterating up and down a connection with some device, but I can't tell which from the log you've included. Is this a Sony laptop?

uhci-hcd is your USB driver.

Another thing to do next time you post is to issue "lsusb" and post the results of that.
 
  


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