(In reply to comment #7)
> (In reply to comment #6)
> > I redirected the output of startx to a log file, but there's nothing
> > interesting in there AFAICS. 
> 
> I don't think the stderr output of startx captures the stderr output of the
> X server. Please manually start just the X server itself and redirect its
> stderr output instead.

waiting for X server to shut down 
(II) evdev: Logitech Unifying Device. Wireless PID:4026: Close
(II) UnloadModule: "evdev"
(II) evdev: HID 046a:0011: Close
(II) UnloadModule: "evdev"
(II) RADEON(0): RADEONCloseScreen