On Tue, Apr 14, 2015 at 10:52:21AM -0400, Alan Stern wrote:
> On Tue, 14 Apr 2015, Alistair Grant wrote:
>
> > Hi Mathias and Alan,
> >
> > As Mathias requested, I've included the usbmon output with the patch
> > applied.
> >
> > It didn't make any difference to the end result, the mouse still fails
> > to initialise correctly (no real surprise, I think), but is getting the
> > same string that Alan reported earlier ("Laser 0"). I've also included
> > the relevant lines from syslog below. (I also have a pcap file
> > captured with tshark if anyone is interested).
> >
> > As always, thanks for your help,
> > Alistair
> >
> > usbmon output:
> ...
> > ffff880024c51b40 591168422 S Ci:1:006:0 s 80 06 0302 0409 00ff 255 <
> > ffff880024c51b40 591169070 C Ci:1:006:0 -32 15 = 18034c00 61007300 65007200 200030
> > ffff880024c51b40 591169098 S Ci:1:006:0 s 80 06 0302 0409 00ff 255 <
> > ffff880024c51b40 591169854 C Ci:1:006:0 -32 15 = 18034c00 61007300 65007200 200030
> > ffff880024c51b40 591169884 S Ci:1:006:0 s 80 06 0302 0409 00ff 255 <
> > ffff880024c51b40 591170684 C Ci:1:006:0 -32 15 = 18034c00 61007300 65007200 200030
> > ffff880024c51b40 591170702 S Ci:1:006:0 s 80 06 0302 0409 0002 2 <
> > ffff880024c51b40 591171025 C Ci:1:006:0 0 2 = 1803
> > ffff880024c51b40 591171037 S Ci:1:006:0 s 80 06 0302 0409 0018 24 <
> > ffff880024c51b40 591171668 C Ci:1:006:0 -32 15 = 18034c00 61007300 65007200 200030
> > ffff880024c51b40 591171679 S Ci:1:006:0 s 80 06 0302 0409 0018 24 <
> > ffff880024c51b40 591172455 C Ci:1:006:0 -32 15 = 18034c00 61007300 65007200 200030
> > ffff880024c51b40 591172466 S Ci:1:006:0 s 80 06 0302 0409 0018 24 <
> > ffff880024c51b40 596169148 C Ci:1:006:0 -2 0
>
> This is practically identical to the EHCI trace from before, right up
> to the point where the mouse's firmware crashes. I can't explain the
> difference in behavior; it must be some very subtle timing-related
> issue.
>
> There doesn't seem to be anything more to try. :-(
Hi Alan,
As always, thanks very much for your assistance. The machine that it
works on is quite a bit slower than my laptop, I might continue to
have a play with this and see if it is a less subtle timing issue, i.e.
whether just slowing down the host interactions allows the mouse to keep
up.
Thanks again,
Alistair
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