Screen freeze requiring reboot

[Guus Ellenkamp]

I have a problem with my screen freezing using an AMD graphics card. I 
already replaced the card with another type, but the problem still 
persists, so it really smells like 'driver' and not hardware, what I 
suspected first.

I sent other e-mails with details about the problem, but I was wondering 
who are the people responsible for these drivers and if and how I can 
help solve this issue.

I also need this problem solved, as I am using this computer for work, 
and it is very annoying having to reboot it once or twice a day during 
work, so the problem is urgent.