scanner stopped working

[peer]

os: debian kde testing
scanner: canon lide 25
my scanner does work properly with simple-scan in kernel 5.7.0.3
But is does not work anymore in kernel 5.8.0.1
When I go back to kernel 5.7.0.3 it works again
The scanner is found by simple scan (and scanimage -L) but when I want to make a scan the program hangs and after that the scanner is no longer found.

strange: the last update showed dependency problems with virtualbox 6.1.14. Synaptic removed virtualbox before performing the update. After that I could not reinstall virtualbox 6.1 but installing virtualbox 6.0.8 worked.
And now simple-scan also seems to work in kernel 5.8.0.1!!!!!!!!!!!!

[peer]

follow up:
remove virtualbox completely. Virtualbox has it own problems
tested scanner in windows on same pc: works ok
now problem exist in both kernels (5.7.0.3 and 5.8.0.1)
in terminal:

Code: Select all

peer@debian:~$ scanimage -L
device `plustek:libusb:001:005' is a Canon CanoScan LiDE25 flatbed scanner
peer@debian:~$ scanimage -L

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).

The first time 'scaninage -L' recognizes the scanner correctly. The scond time 'scanimage -L' could not identify any scanners

[peer]

update: the scanner does work sometimes. But most of the time it does not work.
When I enter the command "scanimage -L" the scanner is found but when I repeat the command directly no scanners were found.

Code: Select all

peer@debian:~$ scanimage -L
device `plustek:libusb:001:005' is a Canon CanoScan LiDE25 flatbed scanner
peer@debian:~$ scanimage -V
scanimage (sane-backends) 1.0.27; backend version 1.0.27

The problem also occurs when I enter the command as root.

I think it is very strange that the scanner is found correctly at first but after that the scanner information is disappeared.
Does someone has an idea where to look???

[peer]

at last I found a temperarely solution.
The plustek scanners need a lock directory: /var/lock/sane.
After creating this map (mkdir -m777 /var/lock/sane) my scanner does work again. After reboot I have to create the map again because the /var/lock/ map is cleaned at shutdown (or boot)

I found the answer on the debian bug reporting page: https://bugs.debian.org/cgi-bin/bugrepo ... bug=971584

[peer]

The temporarily solution to create the map /var/lock/sane at boot did work for a few weeks.
Now I have the following situation:
"sane-find-scanner" does find my scanner
"scanimage -L" does not give any output. The command just hangs.
Then I run devuan in virtualbox. After stopping devuan and closing virtualbox "scanimage -L "does work and I am able to perform a scan with simple-scan.

What is going on????????

I was thinking of a usb problem so I added a line to my script that I run at boot. A few years back there was a problem with usb 3 which could be solved with an environment variable. So I added this variable SANE_USB_WORKAROUND:

Code: Select all

#!/bin/bash
#create map
if [ ! -d "/var/lock/sane" ]; then
    mkdir -m777 /var/lock/sane
fi
#create usb-variable
export SANE_USB_WORKAROUND=1

And after reboot my scanner works again. I hope it will continue to work in the future.