I have a small Windows application written in Visual Basic which controls an automatic battery charger via a serial port. Under FC5, kernel 2.6.15... and wine 0.9.2 it ran fine. Now, under Fedora 7, kernel 2.6.21-1.3194.fc7 and wine 0.9.36 or 0.9.53, it appears that the app can't see the charger as it hangs during the initialisation stage. I didn't write it so I don't know how 'smart' it might be but it seems that if there is no response from the charger it just waits and waits... I have set the permissions on the port, I am not running SELinux if that would have any effect and the original app and the charger hardware work fine under Windows. The port works ok under linux. My guess is that something in the later kernels is causing the problem but I've been wrong before.