Bug#989073: cups: Samsung ML-1640 USB printer not working, needs longer USB timeout

[Didier 'OdyX' Raboud <odyx@debian.org>]

Control: tags -1 +pending

Le mardi, 25 mai 2021, 11.00:59 h CEST Mikko Rapeli a écrit :
> Latest cups from unstable doesn't work with old USB printers anymore.
> At least Samsung ML-1640 just prints an error like
> "INTERNAL ERROR - Incomplete Session by time out".
> 
> Root cause seems to be:
> 
> https://bbs.archlinux.org/viewtopic.php?id=265299
> 
> https://github.com/OpenPrinting/cups/pull/160/commits/d2f41769f208729438414c
> 76983385f0f13ef9b7
> 
> After applying this patch printing works again:
> 
> src/cups-2.3.3op2# diff -up backend/usb-libusb.c_orig backend/usb-libusb.c
> --- backend/usb-libusb.c_orig	2021-05-25 11:41:02.981961321 +0300
> +++ backend/usb-libusb.c	2021-05-25 11:42:39.990717869 +0300
> @@ -1704,7 +1704,7 @@ static void *read_thread(void *reference
>      readstatus = libusb_bulk_transfer(g.printer->handle,
>  				      g.printer->read_endp,
>  				      readbuffer, rbytes,
> -				      &rbytes, 250);
> +				      &rbytes, 60000);
>      if (readstatus == LIBUSB_SUCCESS && rbytes > 0)
>      {
>        fprintf(stderr, "DEBUG: Read %d bytes of back-channel data...\n",
> (int)rbytes);
> 
> Please consider applying this, thanks.

Hello Mikko, and thanks for your bugreport,

This is indeed a USB printing regression, and I just filed an unblock request 
to get this fixed in Bullseye. I'll upload to experimental now too.

Best regards,
    OdyX

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