Easy way to set that parameter: Run 'sudo xdiagnose', then in the GUI
tick the first checkbox (Graphics debugging), exit, and reboot. Then
collect your dmesg and it should have the required debug info.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Triaged => Incomplete
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https://bugs.launchpad.net/bugs/855124
Title:
XRANDR operations very slow unless (phantom) HDMI1 disabled
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