DPMS in one of two monitors

[Diego Cardinali]

Hello!
I am using Lubuntu 18.04 64bit with a radeon hd4650 video card and I'm
using a monitor on vga port and a tv on hdmi.
I am trying to enable dpms settings only for the vga monitor while
disabling it for the tv-hdmi
I did some searches around and came up with this solution: create a
10-monitor.conf file to put in /usr/share/X11/xorg.conf.d/ with the
following text


Section "Monitor"

Identifier   "HDMI-0"

Option "RightOf" "VGA-0"

Option          "DPMS" "true"

EndSection



Section "Monitor"

Identifier   "VGA-0"

Option "LeftOf" "HDMI-0"

Option          "DPMS" "false"

EndSection




Section "ServerFlags"

Option "StandbyTime" "1"

EndSection


I used the same identifiers xrandr uses
I have set a low standbytime so it's easier to check if it works or not.
At the moment it doesn't work at all, not even in the tv-hdmi output, but
the ServerFlags section does affect the system (as far as I know checking
with xset -q)
You can find my Xorg.0.log at https://pastebin.com/5KB16DJ0 , where I
noticed

[    27.014] (==) RADEON(0): DPMS enabled

any suggestions?
I tried with xset but it affects both the monitors

Thanks in advance!
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