Fingerprint reader gets warm when screensaver is locked

[VS]

Binary package hint: gnome-screensaver

System: Thinkpad T61 running Ubuntu 8.04

lsusb info: Bus 001 Device 018: ID 0483:2016 SGS Thomson Microelectronics Fingerprint Reader

When I lock the screen using gnome-screensaver, the fingerprint reader on my Thinkpad T61 gets really warm after a while. The same effect can be achieved by leaving 'tf-tool --acquire' running in a terminal for a minute or so. I'm not sure whether this is a bug in thinkfinger or gnome-screensaver, but filing against gnome-screensaver because it probably shouldn't poll the fingerprint reader while the password prompt isn't up.

gnome-screensaver version: 2.22.2-0ubuntu1
libthinkfinger0 and libpam-thinkfinger versions: 0.3+r118-0ubuntu3

[Pedro Villavicencio (pedro)]

thanks for the report, it's indeed weird, can you test the same with xscreensaver to see if you get a similar behavior? thanks.

[VS (storvann)]

Nope, it works as expected with xscreensaver. The fingerprint reader gets warm only while the password prompt is visible.

I've experimented a bit more with gnome-screensaver, and it seems like it only happens after the prompt has been shown once and timed out. (Does the prompt go away when it times out and the screen gets turned off?)

[Pedro Villavicencio (pedro)]

Ok, no idea then. Ted do you have any ideas on what can produce this behavior? thanks.

[Chris Jones (cmsj)]

It sounds like the pam module is talking to the fingerprint scanner and then doesn't close/kill that resource when the password prompt times out.

[Sanhe (sanhex)]

The same problem on my Thinkpad T61, but not warm, it's hot.

[eldad (eldad-a)]

check:

http://www.thinkwiki.org/wiki/How_to_enable_the_fingerprint_reader_with_ThinkFinger#Fix_for_the_fingerprint_reader_getting_too_hot

[Sebastien Bacher (seb128)]

do you still get the issue on jaunty?

[Pedro Villavicencio (pedro)]

Thanks for the report Vegar , It has been a long time without any comment or a duplicate in this bug report and It is possible that the bug has been fixed. May you please try to reproduce it with the latest Stable Release of Ubuntu the Natty Narwhal and add the respective comments to the report? You can learn how to get that release at http://www.ubuntu.com/download . Thanks again and we appreciate your help.

[Launchpad Janitor (janitor)]

[Expired for gnome-screensaver (Ubuntu) because there has been no activity for 60 days.]