Kernel Bug Tracker – Bug 7088
usb bandwidth problem with low speed hardware
Last modified: 2008-03-29 22:21:18 UTC
Most recent kernel where this bug did not occur:
Distribution: Suse 10.1
Hardware Environment:amd 64 bits, asus a8n-vm motherboard
Software Environment: kde
have some usb problem
i have a ups connected to the usb controler
on another controler i have an usb webcam
i get some strange problem, the webcam don't work, if the ups is connected
the ups is a slow device and seem to block all device...
if i remove the ups and connect a usb mouse, i get the same problem
a mouse is a slow device and block other usb device
with the (mouse or ups) and the webcam i get this error
spca5xx.c: init isoc: usb_submit_urb(0) ret -28
Can you provide the output of the /proc/bus/usb/devices file with everything
plugged in? (as an attachment please).
And also all of the kernel log messages?
Also, can you try the 2.6.18-rc5 kernel out? It has a much improved code for
handling the high/low speed issues in the ehci host controller.
Created attachment 8929 [details]
Created attachment 8930 [details]
both file you asked are in attachment
i installed the 2.6.18-rc5 but not the source.... need to recompile webcam
will do it this week
i tried with 2.6.18-rc5-git6-2-default kernel and i get the same problem
i join some files
Created attachment 9030 [details]
Created attachment 9031 [details]
Created attachment 9032 [details]
var log message
Can you try the newest kernel (2.6.22-rc4)? It has multiple fixes for USB, good chance that your problem has been addressed.
Closing this bug for no recent activity.
please reopen if still exists in the latest kernel.