[sane-devel] sane, 2.6 + hotplug scripts

[Oliver Schwartz]

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Hi,

On Friday 23 April 2004 14.38, Jago Pearce wrote:
> - recompiled sane with libusb support
> - added hotplugging support to the kernel
> - copied tools/hotplug/libsane.usermap and libusbscanner to
> /etc/hotplug/usb/
> - verified my scanner (acer640U) is in libsane.usermap
> - ran /etc/init.d/hotplug restart
>
> With the presence of libsane.usermap in /etc/hotplug/usb/ that
> start up scripts go crazy
> outputting stff to the screen. /proc/bus/usb/ permissions remain as
> root.

the hotplug handling changed significantly from kernel 2.4 to 2.6, if 
I read the documentation correctly it even changed from 2.5 to 2.6. 
If you upgrade your kernel to 2.6 you should definitely upgrade the 
hotplug package as well.

I've seen strange things happen on my machine as well with old hotplug 
scripts (Suse 8.2, upgraded to Suse kernel 2.6.5, 
hotplug-2002-08-26). It seems that the hotplug script re-detects the 
scanner after each scan. This sometimes causes the frontend to hang 
when starting a new scan. I have a feeling that this also accounts 
for some of the other problems people have using SANE on 2.6.

> The scripts are exactly as they are in the distribution tarballs.

I'm not sure if the scripts can be used with newer versions of 
hotplug, but they should be easily adoptable. I haven't tried it 
here, though.

Another workaround may be to completely disable hotplugging for the 
time being, but that has a number of other drawbacks.

- -Oliver
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