The cause of this issue seems to be in fact Linux kernel
4.14.0-041400rc7 :
With Linux kernel 4.16.0-041600rc5 from http://kernel.ubuntu.com
/~kernel-ppa/mainline and kernel option 'acpi_osi=! acpi_osi="Windows
2009"', Xorg works correctly.
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You received this bug notification because you are
This attachment is the relevant XorgLog.txt
** Attachment removed: "XorgLog.txt"
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1732574/+attachment/5009797/+files/XorgLog.txt
** Attachment added: "XorgLog.txt"
