sane-backends

Bug #85488
Comment #201

Comment 201 for bug 85488

Revision history for this message

etx90 (bruno-germain5) wrote on 2007-05-12: Re: [Bug 85488] Re: some usb_devices fault if usb_suspend enabled

#201

Nicolas M a écrit :
> Well, I'm now able to run correctly my Canon N650U with xsane although it was not working at all in Feisty, even when trying with scanbuttond. Everything works, preview, scan, calibration, and return of the lamp back to stop position.
> Here are the few steps I've done for that.
>
> - I've noticed that if you try a scan with xsane only (no scanbuttond running) and then kill xsane to exit, udev becomes unstable.
> At that point, using next scanbuttond with xsane _does not_ work also. I needed to restart udev (sudo invoke-rc.d udev stop / sudo invoke-rc.d udev start) or better : reboot the computer
> => So first point: a clean udev freshly running and not hung by a previous xsane crash scan.
>
> - I've then used udol's idea and played with scanbuttond parameters. This did the trick.
> However, udol's tweaks made the CPU go to 100% load. So I checked a little bit deeper the scanbuttond parameters
> In fact, the -p and -r parameters are expressed in microseconds, not milliseconds. That's why the default settings use large numbers. This gives default 333 millisec for polling and 2 sec for retry. This last figure is a little bit high, compared to the USB_SUSPEND timeout. That's makes the scan lamp not return completly back after the scan.
> After a few tweaks, I've used the following scanbuttond command, changing the retry delay to 1sec:
> $ scanbuttond -r 1000000
> With this tweak, xsane runs perfectly with my CanoScan N650U.
> => At least, I can now wait for a Feisty fix.
>
> - I've just thrown the following in a small script to run my scanner now:
> scanbuttond -r 1000000
> xsane
> killall scanbuttond
>
> - scanbuttond polling can be checked with:
> $ sudo udevmonitor -e
> You should see udev events when the scanner is plugged in and scanbuttond running.
>
>
Thank you.

My canon N656U works now with Feisty and Xsane !!

If you speak french (your name sounds french) : tu pourrais laisser ton
truc dans la doc d'Ubuntu.fr (si ce n'est déjà fait), pour ma part je
communique ton astuce sur le forum pour aider ceux qui ont le même
problème. Merci

Nicolas M a écrit :
> Well, I'm now able to run correctly my Canon N650U with xsane although it was not working at all in Feisty, even when trying with scanbuttond. Everything works, preview, scan, calibration, and return of the lamp back to stop position.
> Here are the few steps I've done for that.
>
> - I've noticed that if you try a scan with xsane only (no scanbuttond running) and then kill xsane to exit, udev becomes unstable. 
> At that point, using next scanbuttond with xsane _does not_ work also. I needed to restart udev (sudo invoke-rc.d udev stop / sudo invoke-rc.d udev start) or better : reboot the computer
> => So first point: a clean udev freshly running and not hung by a previous xsane crash scan.
>
> - I've then used udol's idea and played with scanbuttond parameters. This did the trick. 
> However, udol's tweaks made the CPU go to 100% load. So I checked a little bit deeper the scanbuttond parameters
> In fact, the -p and -r parameters are expressed in microseconds, not milliseconds. That's why the default settings use large numbers. This gives default 333 millisec for polling and 2 sec for retry. This last figure is a little bit high, compared to the USB_SUSPEND timeout. That's makes the scan lamp not return completly back after the scan.
> After a few tweaks, I've used the following scanbuttond command, changing the retry delay to 1sec:
> $ scanbuttond -r 1000000
> With this tweak, xsane runs perfectly with my CanoScan N650U.
> => At least, I can now wait for a Feisty fix.
>
> - I've just thrown the following in a small script to run my scanner now:
> scanbuttond -r 1000000
> xsane
> killall scanbuttond
>
> - scanbuttond polling can be checked with:
> $ sudo udevmonitor -e
> You should see udev events when the scanner is plugged in and scanbuttond running.
>
>   
Thank you.

My canon N656U works now with Feisty and Xsane !!

If you speak french (your name sounds french) : tu pourrais laisser ton 
truc dans la doc d'Ubuntu.fr (si ce n'est déjà fait), pour ma part je 
communique ton astuce sur le forum pour aider ceux qui ont le même 
problème. Merci