After I installed Xorg-server and Xfce I was getting these errors:

(EE) Failed to load module "i915" (module does not exist, 0)

at first though it worked despite that and I figured I'd deal with it later.

Then it stopped working, said there were no screens of acceptable configuration, I tried changing almost everything under the sun to no avail. Then I just unemerged and reemerged Xorg-server. It worked again.

Now I am getting the first two errors, but not the "i915" error. Also when I logout of Xfce I can see that xscreensaver is complaining about something or other, which I am not sure if it is related or not.
And various things are saying Fatal IO error 11 (Resource temporarily unavailable) followed by error setting MTRR (base = 0xd0000000, size = 0x10000000, type = 1) Inappropriate ioctl for device (25).

Now for now it seems to be working despite this, but I am just concerned it'll stop again if I don't fix it.