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Prevent HDMI from losing signal after lock/blank screen

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This worked for me:

xset -dpms
The -dpms option disables DPMS (Energy Star) features.

For permanent solution:

echo "xset -dpms" >> ~/.xinitrc
If it doesn't work or want more user friendly way, add xset -dpms to:

System Tools → Preferences → Startup Applications

(Thanks goes to Ingo Karkat and user.dz)


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