Upstream has suggested several tests to try to see if it eliminates the
problem:
Section "Device"
Identifier "MY Video Device"
driver "intel"
...
Option "LVDSFixedMode" "true"
EndSection
-or-
Option "NoDDC" "True"
--
[i915] xorg intel driver reports Couldn't find PLL settings
https://bugs.launchpad.net/bugs/312133
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