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So I'm using my motherboard's (ASUS Z170-A) HDMI display to out put to my VIZIO 40" 4k TV.

Every time I turn my TV off and turn it back on, regardless of time period I get "No Signal."

I've done some searching around and tried light-locker-settings, but that repeatedly failed after I even attempted repairing the py files. I've also have updated and upgraded everything so its fully up to date.

I'm at a complete loss and I shouldn't have to lose my session each time I go to turn my display off.

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Support for skylake is limited yet and maybe that's the problem. Try installing the kernel 4.6.2 (some have boot problems with that so better know how to remove it as well). If that doesn't fix it you can try using this ppa launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers (better have ppa-purge installed so that you can revert the changes because it might break your system). – Thanos Apostolou Jun 12 '16 at 15:05
    
@ThanosApostolou I tried both these methods and neither work. Still not having a display after the monitor is turned off/turned on. – Trevor Jun 12 '16 at 17:14
    
Since no one has answered try to update linux-frimware from here launchpad.net/ubuntu/+source/linux-firmware/1.158 (never have done it and I don't know exactly what it does and what problems it may cause). – Thanos Apostolou Jun 13 '16 at 12:17
    
Also it would be nice to create a live cd/usb with Ubuntu or Ubuntu-MATE and choose try (not install) and see if the problem with hdmi exists there too. – Thanos Apostolou Jun 13 '16 at 12:28
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This appears to be a known bug in xubuntu 16.04, see https://bugs.launchpad.net/ubuntu/+source/xfce4-settings/+bug/1575123

There have been workarounds posted on http://forums.whirlpool.net.au/archive/2529958. One is a script that I have tried (and it did work):

#!/bin/sh
#Fix TV state when HDMI link is lost.
#By Mario Limonciello <email address hidden>

OUTPUT="HDMI3"
BAD_MODE="1280x720"
GOOD_MODE="1920x1080"

for MODE in $BAD_MODE $GOOD_MODE; do
DISPLAY=:0 xrandr --output $OUTPUT --mode $MODE
sleep 2
done

The OUTPUT variable may need to be edited to suit your display. Use xrandr to find your own value for it.

Another post includes a /usr/share/X11/xorg.conf.d/*.conf file that apparently works for some. I won't quote it here because (for some reason) it froze my display.

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This works if it's run from within the xfce4 session. But if the monitor is powered off, I can't run this from within. Running from one of the tty (ctrl+alt+f1) returns error, saying it failed to configure ctrc. Any work around? – Jeenu Nov 6 '17 at 12:59
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This was a tough one for me. I fought it for several months.... BUT... I have my Mythbuntu DVR finally running with NO problems. It turns out it is a handshake issue between a newer TV and your computer (any computer, mine just happens to be Mythbuntu) in regards to the HDMI input to the TV. My newer DVD player and my Roku worked fine because I suppose they know the secret handshake, lol. Anyway, without all of the technical reasons, I was able to get my Mythbuntu to run perfectly using an HDMI Splitter . I ordered mine thru Amazon for $20. https://www.amazon.com/dp/B004F9LVXC/?tag=hotoge-20

THIS FIXED THE PROBLEM! I am a happy camper now.

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