The message in Xorg.0.log is: (EE) BUG: triggered 'if (inSignalContext)' (EE) BUG: /var/tmp/portage/x11-base/xorg-server-1.13.0-r1/work/xorg-server-1.13.0/os/log.c:484 in LogVMessageVerb() (EE) Warning: attempting to log data in a signal unsafe manner while in signal context. Please update to check inSignalContext and/or use LogMessageVerbSigSafe() or ErrorFSigSafe(). The offending log format message is: VMWARE(0): vmmouse enable absolute mode (EE) (EE) Backtrace: (EE) 0: /usr/bin/X (xorg_backtrace+0x55) [0x10f03491] (EE) (II) VMWARE(0): vmmouse enable absolute mode Mouse seems to work fine, though (tested in QEMU).
The xserver has stopped doing the SIGIO mess.