I've been chasing this same issue and reported it (albeit lacking details)
on previous LXDE spin beta [1]. I can reproduce on latest image,
using same kernel as Richard, however sshd doesn't appear to be up
for me so I'm having trouble getting a dmesg off the device. If I have
any luck I'll put it up here. I was also using HDMI out, to a ASUS VX238
(1920x1080 native)
Dexter
[1]
https://bugzilla.redhat.com/show_bug.cgi?id=1384295