Scanner light goes off after each scan

[Volans]

Hello, I have a small problem.

I'm using a scanner with Fedora. However, linux does something that is undesirable; It turns off the scanner light, everytime it does a scan, which the HP software, which comes for windows, doesn't do. The result? The light never warms up enough and all the images come with a blue tone on them. Only after using the scanner a few times, the light warms up enough and the images start getting their true colour.

The question is, can I somehow force the light to stay on, even during scans, like it happens when I am using Windows? Or not? Anyone has ideas?

Regards!

[marko]

I"ve noticed that some of the scanner backends support an option called 'lampOff',
an example is sane-plustek (take a look in the man page for sane-plustek:
man sane-plustek

But I'm getting you're using one of the HP backends, I don't see the lampOff setting
for them

If you go in /etc/sane.d and search for lampOff you'll see that these backends have it:

> cd /etc/sane.d
> grep -l lampOff *conf
plustek.conf
plustek_pp.conf
u12.conf

So basically I can't think of what can be done if you don't have one of the scanners that has lampOff, there's some reason why this option isn't a general sane option but I don't know why that is.

[Volans]

Hello Marko, thank you for your reply.

I have tried what you said. Unfortunately, my scanner isn't named in that folder. It's a HP 3500C. I did the grep command and only a file from a scanner with 3 separate lights (blue, red, green) has that option.

Isn't there a general conf file for sane?


Regards

[marko]

Only those few have a control setting for timing out the bulb

There's a file called /etc/sane.d/saned.conf
but otherwise the files in /etc/sane.d are the backend configuration files, your scanners file
is /etc/sane.d/sane-hp3500.conf but I don't see it in the /etc/sane.d directory but the man page for sane mentions it.

here's some of the details of that config file online:

http://www.sane-project.org/man/sane-hp3500.5.html

or see

"man sane-hp3500"