https://bugs.freedesktop.org/show_bug.cgi?id=72159

--- Comment #9 from octoploid octoploid@yandex.com --- (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