Alan Stern wrote:
> On Tue, 13 Mar 2007, Gordon Messmer wrote:
> 
>> 2.6.20 behaves the same.  If I built a preemptible kernel, (with preempt 
>> the BKL) and the timer frequency is 1000 HZ, then the mouse has issues. 
>> If I build a kernel with a lower frequency, or with voluntary 
>> preemption at any timer frequency, I don't see the problem.
> 
> This seems so unlikely, I have trouble believing it's not a hardware
> problem.   Have you tried using a different mouse?  Or using your mouse on
> a different computer?

Maybe it is a hardware problem.  I know that I'm not the only person 
affected, though none of the other people who are got anywhere with the 
issue.

I have tried other mice with this PC.  I have an old MS optical 
Intellimouse (the second worst mouse I've ever used), and a newer 
revision of the problematic Logitech BD-58, a BT-58.  Both other mice 
work without issue.  I've also tried the BD-58 in several other PCs, 
running the same kernels.  Only this mouse, in this PC, with this 
specific kernel configuration manifests the problem.

I could just walk away from the problem, but since the kernel 
configuration determines whether or not the problem occurs, it looks to 
me like a bug, and that's the kind of thing I have a hard time leaving 
behind.

I guess that, from my point of view, if it's a hardware bug, it'd be 
nice to be able to tell users who come across the issue what they should 
be looking for.

> What about if you turn on preemption but not preempt-BKL (shooting in the 
> dark)?

I don't know, but I'll give it a shot.

> Do you think the errors are correlated with, say, disk activity?

I'll try watching iostat and usbmon output at the same time and see if 
anything looks suspicious.

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