Please see https://bugs.edge.launchpad.net/ubuntu/+source/gnome-desktop/+bug/215751 There is a bug when edid data is present but not complete. In that case a NULL pointer is returned, but not checked for, the attached patch rectifies that. The other part of the patch is a function that would fail later if this was the case. Thanks, James
Created attachment 303697 [details] Handle incomplete edid
Soren added the first part, the second I don't think is necessary.