https://bugzilla.kernel.org/show_bug.cgi?id=71461
--- Comment #6 from Tom Yan tom.ty89@gmail.com --- Created attachment 127911 --> https://bugzilla.kernel.org/attachment.cgi?id=127911&action=edit Xorg.0.log
Maybe it's because I have some misconcept about xorg log, it doesn't seem to vary between cases. Anyway this issue doesn't seem to be related to X a lot.