On Sat, 31 Jul 2004, Sven-Olof Klasson wrote:

> I applied these patches on a clean 2.6.7 tree. With these patches the camera
> is sometimes recognized by Linux. It does not allways work. Below is a example
> where Linux recognized the camera on the 4th attempt.

It beats me what could be going on here.  Maybe it's a strange timing 
issue, maybe something else.  Can you try attaching the camera to a 
different computer to see if it works any better?  Just for variety, try 
using one with an OHCI USB controller if you can.

> After that I can start to copy files. Coping files seems to work fine as
> long as I dont issue any dmesg commands. It has happend to me twice when I run
> tests with these patches that exactly when I issue a dmesg command the file
> copy fails. See the debug messages below.

There's absolutely no reason that dmesg should cause a file transfer to 
fail.

> It does not fail allways when I issue dmesg commands. It works mostly. I
> estimate it fails on 1 of 20 dmesg commands (based on my very limited testing
> so far).

Either it's a coincidence or else something even stranger is going on...  

> The kernel I used has USB_STORAGE_DEBUG=n. Let me know if it would be 
> interesting to try with USB_STORAGE_DEBUG=y.

That would help for trying to find out why the file copies fail.

Alan Stern



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