Comment 72 for bug 997040

Thank you for fix release of cups. However, I am still having the same trouble even after applying the latest cups package.
I have two printers connected via USB, Canon PIXMA MP600 and PIXMA MP630. The symptom is:
* Printer device frequently disappears. We can only see /dev/usb/lp1, no lp0.
* Sometimes printing takes very long time, nearly 1 hour.
* Printing generally succeeds at the first printing after computer is turning on, but fails after that.
* blacklisting usblp and selecting some options (usb-no-reattach, usb-unidir-default=true/false) make no effect.
I have 64-bit Ubuntu 12.04 system and uses drivers provided by Canon, both in 32bit. This seems slightly unstable configuration, but it seems drivers just works fine according to error_log. One strange message from the log is "Got USB transaction timeout during read." (or write), which means usb module has timed out and printer connection has been lost in some reason.
Is anybody out there explain this ?