HP3550 USB Printer and CUPS

[John Wendel]

On Thursday 01 April 2004 10:41 am, Andy Green wrote:
> Hi folks -
>
> I am having some unexpected trouble setting up an HP3550 USB printer on a
> box with fairly current development packages (it is about two weeks out of
> date since I could not find any mirror that had a complete set of headers
> and files since then).  My parents have ordered the same printer and this
> Sunday I planned to hook it up to their similarly configured Fedora laptop
> and show them how to use The Gimp enough to print photos.  So today I was
> hooking up mine so it would go smoothly at my parents.
>
> The printer is recognized fine by hotplug and the usblp module is inserted
> and correctly creates /dev/usb/lp0.  I was able to print the CUPS test page
> okay from system-config-printer too.  So I thought I was doing okay.
>
> I noticed in system-config-printer, and in the CUPS administration page,
> the printer status is reported as having its media tray empty, when this is
> not so.  I saw in the archives a guy with this problem being told it was a
> fake error message and could be ignored.
>
> http://www.redhat.com/archives/fedora-list/2003-November/msg01768.html
>
> The main problem comes with subsequent attempts to print, basically nothing
> happens.  I have been able to cancel print jobs from the CUPS admin
> webpage, but I notice processes that seems to be hung lying around, for
> example right now in ps -Af:
>
> root      2981  1341  1 18:14 ?        00:00:53 usb:/dev/usb/lp0 85 agreen
> (stdin) 1 cpi=12 lpi=7 page-bottom=86 page-left=57 page-right=57
> page-top=72 scaling=100 wrap /var/spool/cups/d00085-001
>
> This process seems to be sleeping most all the time, it is not taking any
> CPU to speak of.  This hung process seems to then block all other attempts
> to print, it does not respond to kill -9 as root, and ignored the job being
> cancelled in CUPS.  The first param and the last filepath are referring to
> this job being #85, which as far as CUPS is concerned is cancelled.  It was
> an attempt to print a jpg in The Gimp.
>
> Does anyone have any advice or suggestions to get further debugging
> information?
>
> -Andy
>
> --
> Find your answer without waiting for replies....
> Searchable list archives at
> http://marc.theaimsgroup.com/?l=fedora-list&r=1&w=2


Google for "patch usblp". This patch fixed my printer problem, which seemed 
similar to yours, of course YMMV.

Regards,

John


--- drivers/usb/class/usblp.c.orig	2004-03-05 17:09:00.412189056 +0000
+++ drivers/usb/class/usblp.c	2004-03-05 17:10:30.121551160 +0000
@@ -609,8 +609,10 @@ static ssize_t usblp_write(struct file *
 	while (writecount < count) {
 		if (!usblp->wcomplete) {
 			barrier();
-			if (file->f_flags & O_NONBLOCK)
+			if (file->f_flags & O_NONBLOCK) {
+				writecount += transfer_length;
 				return writecount ? writecount : -EAGAIN;
+			}
 
 			timeout = USBLP_WRITE_TIMEOUT;
 			add_wait_queue(&usblp->wait, &wait);
@@ -670,7 +672,8 @@ static ssize_t usblp_write(struct file *
 
 		usblp->writeurb->transfer_buffer_length = transfer_length;
 
-		if (copy_from_user(usblp->writeurb->transfer_buffer, buffer + writecount, 
transfer_length)) {
+		if (copy_from_user(usblp->writeurb->transfer_buffer, 
+				   buffer + writecount, transfer_length)) {
 			up(&usblp->sem);
 			return writecount ? writecount : -EFAULT;
 		}