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Avermedia 771 DVB-T always busy

I successfully installed the AverMedia AverTV 771 DVB-T card on my Ubuntu (Kernel 2.6.12) and I have watched TV with xine and mplayer.
Then I installed a lot of things, mythtv among it and it was still working fine.

Now it doesn't work anymore, I don't know what has caused it. Mythtv can not connect to the device anymore. I did an strace on xine and mplayer for dvb://[Name] and found this:

Code:

open("/dev/dvb/adapter0/frontend0", O_RDWR|O_LARGEFILE) = -1 EBUSY (Device or resource busy)

How can I find out, what process keeps using the device? I'm fairly new to Linux so if there is a trick for that I would love to learn about it!

Command 'lsof' lists all open files and the processes using them.

Added later:

I've also had possibly related problems using mencoder with the TV card. After running for a specified period (using the -endpos option) the program fails to quit. It stays running as an unkillable process, blocking access to the DVB devices. I have to reboot to get rid of it. I don't have a solution at this stage. I will try a kernel upgrade (presently 2.6.13 with multimedia patches) sometime.