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Main => Raspberry Pi & Dev Board => Topic started by: wirelessjava2002 on May 29, 2015, 04:15:25 pm

Title: Monitor not recognising PI booting at same time
Post by: wirelessjava2002 on May 29, 2015, 04:15:25 pm
My monitor and Raspberry PI are booting at the same time, from the same mains power inlet into the cabinet. (Old VGA monitor using an HDMI to VGA adapter) However the monitor doesn't display the PI
(Re-Booting the Pi after the monitor has power works fine)

Does anyone know of an elegant way to delay the Pi until the monitor has power? (Or other solution to display PI from single AC power source/switch)

I have searched the forum but didn't come up with anything.

Thanks in advance.
Title: Re: Monitor not recognising PI booting at same time
Post by: pbj on May 29, 2015, 05:11:29 pm
http://www.amazon.com/Power-Supply-Adjustable-Trigger-Module/dp/B00E1JNLTS (http://www.amazon.com/Power-Supply-Adjustable-Trigger-Module/dp/B00E1JNLTS)
Title: Re: Monitor not recognising PI booting at same time
Post by: wirelessjava2002 on May 30, 2015, 04:41:12 pm
Thank you, this looks as if it could do the trick.
Title: Re: Monitor not recognising PI booting at same time
Post by: jan on June 09, 2015, 05:15:34 am
This worked fine in my case (no hardware needed): add (or uncomment) hdmi_force_hotplug=1 in /boot/config.txt.

More info: http://raspberrypi.stackexchange.com/questions/2169/how-do-i-force-the-raspberry-pi-to-turn-on-hdmi (http://raspberrypi.stackexchange.com/questions/2169/how-do-i-force-the-raspberry-pi-to-turn-on-hdmi)
Title: Re: Monitor not recognising PI booting at same time
Post by: ArcadeNerd on June 15, 2015, 09:36:45 pm
I had the same problem.   You have to change the boot config.txt.  this shows you how to change it.

http://elinux.org/R-Pi_configuration_file (http://elinux.org/R-Pi_configuration_file)

You can set a boot delay so the pi boots a certain number of seconds after plugged in (which let's the converter and monitor be running when the pi is booting so it can be detected).

In the config.txt add the line boot_delay=3