I pulled my DSE 2 port KVM (XH4512) out of the cupboard this evening so I could install something on a box that is to be headless - ie I have my normal desktop into one port and the destination box into the other.
X still works at the same resolution on the desktop, but all the fonts are suddenly tiny. Running X at 1280x1024 with KDE on gentoo. I know it happened last time I used the KVM too, but I just put up with it. Now I am not so forgiving.
