scanner Epson Perfektion 1670 USB_SUSPEND

[Oleksij Rempel]

snapscane-backend will mutex usb-scanner-device only for scann not for "back to ready" mode. After scann scanimage (or xsane) will snapscani_mutex_close and the kernel after 2 seconds will USB_SUSPEND. The scanner will newer get to the ready mode becous it will be suspended.

see the bug: http://bugzilla.kernel.org/show_bug.cgi?id=8231

Steps to reproduce:
1. Plug in scanner Epson Perfection 1670
2. scanimage -d snapscan > test.pnm
3. After scann It freez.

This patch for sane-backends solwe two of problems on my scanner:

--- sane-backends/backend/snapscan-usb.c.old 2007-03-19 11:22:12.000000000 +0100
+++ sane-backends/backend/snapscan-usb.c 2007-03-19 11:21:36.000000000 +0100
@@ -231,6 +231,7 @@ static void snapscani_usb_close(int fd)
     }
     urb_counters->read_urbs = 0;
     urb_counters->write_urbs = 0;
+ sleep(5);
     snapscani_mutex_close(&snapscan_mutex);
     sanei_usb_close(fd);
 }

ProblemType: Bug
Architecture: i386
Date: Mon Mar 19 11:20:56 2007
DistroRelease: Ubuntu 7.04
Uname: Linux zwerg 2.6.21-rc4 #4 Mon Mar 19 08:33:21 CET 2007 i686 GNU/Linux

[Oleksij Rempel (olerem)]

The second issue fixed with this patch (hack).

https://alioth.debian.org/tracker/?func=detail&aid=304140&group_id=30186&atid=410366

[Oleksij Rempel (olerem)]

http://alioth.debian.org/tracker/index.php?func=detail&aid=304154&group_id=30186&atid=410366

[Emanuel Goscinski (emu--deactivatedaccount)]

Hi fishor,
maybe you can look at this bug: https://launchpad.net/bugs/85488
It might be related to yours.

[Oleksij Rempel (olerem)]

this is wrong solution. the problem is USB_SUSPEND in kernel.