Avoid HDMI flickering/intermittent blanking on RPI with a 1400x1050 VGA monitor.

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hdmi_drive=2
hdmi_group=2
hdmi_mode=42
disable_overscan=1
config_hdmi_boost=7

Black screen and LightDM doesn't unlock

Add this to your /etc/lightdm/lightdm.conf file:

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[LightDM]
logind-check-graphical=true

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(font-lock-mode)