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Raspberry Pi 2, noobs GUI, powered J5create HDMI adaptor going to an old GatewayFPD1750.

The Xorg server blanks the screen after about 10 minutes. I can mess with that timing as described here: Disable screen blanking in X-Windows on Raspbian

Trouble is, after a couple hours of unuse, pressing a key, or moving mouse is no longer enough to bring up the GUI display. If I log in via screen sharing, I can see the mouse move, and letters being typed, the display just doesn't wake. Disconnecting wifi dongle and kybd or mouse does not fix the issue, nor does using a powered USB hub. Unplugging and replugging the HDMI plug does wake the screen, but that's annoying, and what with surface mount there's really no way to solder a switch in there.

However, this pair of terminal commands, entered via the screenshare, will bring back the GUI desktop display for me:

tvservice -p  #(power on hdmi w preferred settings)
xset dpms force on #(turn on HDMI for window server)

Having gotten that far, the question remains: Into which file do I place these commands so that they are always executed when the screen is blank and a key is pressed?

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1 Answers1

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Significant grepping did not turn up any file with a convenient 'tvservice' containing line. So I found a workaround. First as per goldilocks, I tryed connecting a newer monitor, an Acer S200HQL. The problem went away. Not a practical long term solution here though.

Further experience with the old GatewayFPD1750, revealed that the complete set of commands needed to realiably get the GUI screen to come back up after a prolonged powerdown is:

  • tvservice -o #(power off hdmi)
  • tvservice -p #(power on hdmi w preferred settings)
  • xset dpms force on #(turn on HDMI for window server)

This has worked every time, so far; no unplugging HDMI cord needed. I'd guess that the Raspberry is not properly interfacing with old-school screen sleep tech, so I have to completely turn things off before the display can be reinitiated successfully.

It's easy enough to write a bash script for this in: /usr/local/bin

/#! /bin/bash

tvservice -o
tvservice -p
xset dpms force on

Called the file "wakeolddisplay". Don't forget to chmod a+x the file to make it executable.

Then add a keybinding In the keybindings section of /home/pi/.config/openbox/lxde-pi-rc.xml enter image description here

Now when the screen's asleep, and won't wake up, I just press F6, and the GUI screen comes up, ready for use.

Also made a command, F7, that just powers off HDMI: tvservice -o, as that turns off the ugly and wasteful screen backlighting on this old monitor. An F6 will reverse that as well.

Ghanima
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