I am also experiencing this bug on a fresh Sylvia install, pc connected to a tv via HDMI. Power cycling the TV, or even switching the input (eg to my Chromecast) and coming back to the PC input, would result in no input.
Following @Toan's comments, I have installed the xfce4-settings .deb package downloaded from Ubuntu Artful repo, currently at 4.12.1, and that appears to fix the issue.
I am also experiencing this bug on a fresh Sylvia install, pc connected to a tv via HDMI. Power cycling the TV, or even switching the input (eg to my Chromecast) and coming back to the PC input, would result in no input.
Following @Toan's comments, I have installed the xfce4-settings .deb package downloaded from Ubuntu Artful repo, currently at 4.12.1, and that appears to fix the issue.
https:/ /packages. ubuntu. com/artful/ xfce4-settings
Hopefully this version will get updated in Xenial/Syvia.