Genesys, Canon LiDE 50 - Failed to start scanner: Error during device I/O

Hi,

I am having a problem with my LiDE 50.
The head in moving a bit (less thn 1 second) then stop. The
following message
shows up: "Failed to start scanner: Error during device
I/O".

The error remains for all scanning modes: b/w, gray, color
and from 75dpi to
+600dpi.

I use the latest back-end (1.0.18) and front-end (1.0.14)
with xsane (0.991) on
Fedora core 2.

I send the log (SANE_DEBUG_GENESYS=255,
SANE_DEBUG_GENESYS_GL841=255).

Thank you for your help.

Laurent


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Laurent Charpentier schrieb:
> Hi,
> 
> I am having a problem with my LiDE 50.
> The head in moving a bit (less thn 1 second) then stop.
The following message
> shows up: "Failed to start scanner: Error during
device I/O".
> 
> The error remains for all scanning modes: b/w, gray,
color and from 75dpi to
> +600dpi.
> 
> I use the latest back-end (1.0.18) and front-end
(1.0.14) with xsane (0.991) on
> Fedora core 2.
> 
> I send the log (SANE_DEBUG_GENESYS=255,
SANE_DEBUG_GENESYS_GL841=255).
> 

Looks like the error is not inside the backend. A bulk
transfer is
suddenly interrupted after 4 blocks of 65024 bytes.

[genesys_gl841] gl841_bulk_read_data: requesting 390000
bytes
[genesys_gl841] gl841_bulk_read_data: trying to read 65024
bytes of data
[genesys_gl841] gl841_bulk_read_data read 65024 bytes,
324976 remaining
[genesys_gl841] gl841_bulk_read_data: trying to read 65024
bytes of data
[genesys_gl841] gl841_bulk_read_data read 65024 bytes,
259952 remaining
[genesys_gl841] gl841_bulk_read_data: trying to read 65024
bytes of data
[genesys_gl841] gl841_bulk_read_data read 65024 bytes,
194928 remaining
[genesys_gl841] gl841_bulk_read_data: trying to read 65024
bytes of data
[genesys_gl841] gl841_bulk_read_data failed while reading
bulk data:
Error during device I/O

The above error is from the sanei_usb subsystem. You can try
SANE_DEBUG_SANEI_USB=255(hope this is right). That is a bit
more vocal
about the error(especially it tells us what errno the kernel
returned.
look for "sanei_usb_read_bulk: read failed:").

Do you get any suspicious kernel log entries?

Regards,
  Pierre

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Pierre,

> Do you get any suspicious kernel log entries?
dmesg returned the following:
usb 1-2: new high speed USB device using address 7
usbfs: USBDEVFS_BULK failed dev 7 ep 0x81 len 4096 ret -71
usbfs: USBDEVFS_CONTROL failed cmd xsane dev 7 rqt 64 rq 12
len 1 ret -71

Also I've just fixed the problem. This is a pretty ugly fix
(done only once):
- I lock the scanner (using the mechanical lock under the
LiDE 50)
- I try to scan (with xsane).
- The head moves up and down without stopping (ugly noise).
- At some point during this up/down move I unlock the
scanner.

After that the scanner worked again in all modes!

Laurent

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