Xephyr 1.15.1/1.16 crash with Intel ZaphodHeads

[Daniel J Blueman]

On stock Ubuntu 14.04 with X 1.15.1 or 14.10 with X 1.16, Xephyr
crashes when connecting to the first screen of an ZaphodHeads setup
[1]:

# /usr/bin/X -ac :0
# DISPLAY=:0.0 /usr/bin/Xephyr -ac :1
(EE) Backtrace:
(EE) 0: Xephyr (xorg_backtrace+0x56) [0x7fe9b4fd94c6]
(EE) 1: Xephyr (0x7fe9b4e0e000+0x1cf6c9) [0x7fe9b4fdd6c9]
(EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7fe9b3af5000+0xfc90)
[0x7fe9b3b04c90]
(EE) 3: Xephyr (0x7fe9b4e0e000+0x44d29) [0x7fe9b4e52d29]
(EE) 4: Xephyr (0x7fe9b4e0e000+0x3f968) [0x7fe9b4e4d968]
(EE) 5: Xephyr (0x7fe9b4e0e000+0xc7487) [0x7fe9b4ed5487]
(EE) 6: Xephyr (AddScreen+0x101) [0x7fe9b4e98a61]
(EE) 7: Xephyr (0x7fe9b4e0e000+0xc7941) [0x7fe9b4ed5941]
(EE) 8: Xephyr (0x7fe9b4e0e000+0x8e6da) [0x7fe9b4e9c6da]
(EE) 9: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5)
[0x7fe9b1281ec5]
(EE) 10: Xephyr (0x7fe9b4e0e000+0x3e5ee) [0x7fe9b4e4c5ee]
(EE)
(EE) Segmentation fault at address 0x4
(EE)
Fatal server error:
(EE) Caught signal 11 (Segmentation fault). Server aborting

Running it with on the second screen (:0.1), it works just fine.
Anything I'm doing wrong?

Thanks,
  Daniel

-- [1] /usr/share/X11/xorg.conf.d/60-local.conf

Section "Device"
        Identifier "Intel0"
        Driver "intel"
        Option "ZaphodHeads" "eDP1"
        Screen 0
EndSection

Section "Device"
        Identifier "Intel1"
        Driver "intel"
        Option "ZaphodHeads" "HDMI"
        Screen 1
EndSection

Section "Screen"
        Identifier "Screen0"
        Device "Intel0"
EndSection

Section "Screen"
        Identifier "Screen1"
        Device "Intel1"
EndSection

Section "ServerLayout"
        Identifier "default"
        Screen "Screen0" 0 0
        Screen "Screen1" RightOf "Screen0"
EndSection
-- 
Daniel J Blueman