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Problem with USB multi-function devices and upcoming kernel 2.6.13 #1260

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michaelrsweet opened this Issue Aug 27, 2005 · 1 comment

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michaelrsweet commented Aug 27, 2005

Version: 1.2-feature
CUPS.org User: till.kamppeter

I got following e-mail today:


From: Couriousous
To: Till Kamppeter
Subject: Re: Usb all-in-one printer/scanner

-Ok. found why it fail.
This is because I run a 2.6.12-rc2-git2 which doesn't allow anymore that a
kernel driver and usbfs access the same device.
See: http://bugzilla.kernel.org/show_bug.cgi?id=5063 for the explanation.
For the Mandriva kernel, it works because the patch has been applied after
2.6.12 release. But it will fail if mandriva use in a next version a 2.6.13
or greater kernel.

Now, what can I do ? standard mandriva kernel doesn't boot on my box
( #17750 ). But mandriva kernel will fail in a near future too :/
Can cups use libusb and not usblp kernel module to speak to the printer ?

Regards,

Couriousous

This user has an Epson multi-function device with printer and scanner. In an earlier e-mail he complained that for printing the usblp kernel; module must be loaded, but then he cannot scan. For scanning he must unload the module. The problem seems that if a kernel module accesses a USB device there is no access for libusb. Both parts of the device would only work simultaneously if both are accessed via libusb.

So his suggestion is to have the usb CUPS backend modified to be libusb-based and not using the usblp kernel module (/dev/usb/lp0) any more.

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michaelrsweet commented Aug 27, 2005

CUPS.org User: mike

It is highly unlikely that we will do this unless someone develops a new version for us. Put simply, getting USB printing to work right is a major pain (it took Apple until 10.3 to get it right), and the potential gains are not worth it.

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