The problem is that Xorg hasn't registered the igfx as the boot-vga
device and so is looking for a primary display and fails (it loads the
-intel as a secondary GPU only screen).
What is the value in '/sys/devices/pci0000:00/0000:00:02.0/boot_vga' ?
You can manually specify:
Section "Device"
Identifier "Device0"
Driver "intel"
EndSection
in /etc/X11/xorg.conf.d/intel.conf to workaround the issue.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1161371
Title:
X server sometimes fails to start on MacBook Air 5,2: no screens found
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