AGAIN: USB hang on printing & moving mouse

[Aurel Wisse]

Albrecht,

I have reported this problem to the linux-usb-users,
linux-usb-devel and the yellowdog-general lists in the
past: I have the same problem on my iMac Rev. B.

I am surprised you still see the problem in the 2.4.20
kernel, as I got the suggestion to try newer kernels
in the past. I am still running a 2.4.19-pre10 kernel.

>From answers I got (particularly from David Brownell
on the Linux-usb-devel list, who has contributed code
to the Linux-usb effort), it is most likely a bug in
the OPTi USB controller in the older iMacs.

OK, it might work fine in MacOS 8.6, as it does on
mine, but Apple could have written their driver codes
around that bug. The Linux community however writes
along the lines of the USB generic specifications and
adds patches for bugs in frequently used hardware.
Bottom line is: if there were a hacker who happened to
work on USB and who also happens to have the desire
eliminate the bug on one of the earlier iMacs, it
would be done. That leaves you or me to do the job.
Problem is: I don't have the time. So I am using the
following workaround: I don't move the mouse while the
computer is sending data to the printer. Sometimes I
forget, but the I just hard reboot the machine (the
ext3 filesystem comes in handy here).

Cheers,

Aurel

--- Albrecht Dreß <albrecht.dress@arcor.de> wrote:
> 
> Am 16.10.02 22:06:52 schrieb(en) Jim Robinson:
> > to time also. It turned out to be a bad cable, Try
> to plug the printer into
> > a
> > different USB port. Did you try to plug it into a
> powered USB hub? Maybe
> > you are
> > not supplying enough power to the device and when
> you move the mouse it
> > causes a
> > brownout on the USB bus.
> 
> Hmm, I don't think that's the reason, as the printer
> is behind a powered hub
> on the 2nd USB, and kb/mouse are on the 1st... To
> clarify this here is the
> USB layout:
> 
> 
> iMac USB #1 ----> iMac Keyboard
>                           |
>                            --------> Logitech mouse
> 
> iMac USB #2 ----> HAMA USB HUB w/external power
>                       |   |   |
>                       |   |    ----> HP DeskJet 840
> C
>                       |    --------> Imation
> SuperDisk Drive
>                        ------------> Canon Scanner
> 
> So I really guess it's a kernel problem. BTW, using
> MacOS (still 8.6),
> everything works fine...
> 
> Thanks,
> 
> 	Albrecht.
> 
> 
> --
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   Albrecht Dreß  -  Johanna-Kirchner-Straße 13  - 
> D-53123 Bonn (Germany)
>         Phone (+49) 228 6199571  - 
> mailto:albrecht.dress@arcor.de
>
_________________________________________________________________________
> 
> ** Sent via the linuxppc-user mail list. See
> http://lists.linuxppc.org/
> 



__________________________________________________
Do you Yahoo!?
Y! Web Hosting - Let the expert host your web site
http://webhosting.yahoo.com/