I have a problem with this command: xset dpms force off. It puts the screen black, but it doesnt shut down nor suspend (with suspend command) the monitor.
The command 'xset -q' shows that DPMS is enabled in my monitor.
I am using Raspberry Pi with Raspbian on it, and monitor is connected with hdmi - DVI cable (and pins that trasnfers data connections are working).
Can you please help me, maybe tell me where to find the answer or some logs? Maybe there is a configuration file somewhere, that contains information about the amount of energy that is being sent to the monitor when it is on stand-by, enabled or off?
I found that solution: http://shallowsky.com/linux/x-screen-blanking.html ,but I can't install VBETOOL on my computer as it doesn't have PCI ports (and /pci folder).
Answer
I found this raspberry pi specific problem was discussed in this issue with some workarounds.
The framebuffer driver on the pi does or did not implement the appropriate ioctl FBIOBLANK to set the monitor to video off.
The workaround is to use the tvservice command to switch off power to the video signals, and eventually the monitor should turn off. There's a small problem when you use tvservice to turn video power back on however, and you need to workaround round that too, by using chvt to switch out of X11 into the console virtual terminal, then back again.
Demo:
sudo tvservice -o # turn off video
sleep 5
sudo tvservice -p # turn on video
whichvt=$(sudo fgconsole) # which vt are we on
let othervt=which==1?2:1
sudo chvt $othervt; sudo chvt $whichvt
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