HDMI Issue

[OldsManNJ]

I have my Pi hooked to my TV through an HDMI Switch as my TV has only one HDMI input, and I have my neoTV, and my Oplay air connected also. The switch is auto-sensing - it switches the input when a device is powered on, so when I plug in the Pi it switches to the correct input. At any point if I switch the input to any other device, and go back to the Pi - there is no image anymore. the only thing I have found to do is unplug the Pi and plug it back in to get video out to the TV again. Is this an issue with the Pi - is it sensing no monitor and shutting off the HDMI output? Is there anything I can do to overcome this? Reprogram the Pi to not shut off video out through HDMI? I am running the latest build of RASPBMC on a model B board. Thanks to anyone who may respond - I do appreciate your time.

[OldsManNJ]

bump

[johnbeetem]

I haven't had direct experience debugging HDMI issues, but I suggest trying some of the config.txt options listed at: http://elinux.org/RPi_config.txt#Video_ ... figuration

First, try setting "hdmi_force_hotplug=1". This might tell RasPi the monitor is always connected.

If that doesn't work, try "hdmi_safe=1". It will probably set the wrong resolution, but it gives you a starting point. If "hdmi_safe=1" works, try the equivalent "hdmi_force_hotplug=1, config_hdmi_boost=4, hdmi_group=1, hdmi_mode=1, disable_overscan=0". It should have the same behavior as "hdmi_safe=1". Then remove the options one by one and see when it starts to fail.

Another thing that might work is to use the "tvservice" command to find out what your normal monitor setting is: http://elinux.org/RPi_config.txt#Which_ ... monitor.3F

Then put those settings into config.txt, along with "hdmi_force_hotplug=1".

Hope this helps.

[W. H. Heydt]

I have had this problem running a Pi through a KVM switch...

The problem is that the Pi will blank the monitor/TV after a while if there is no user input.

If you have the GUI running, do this to turn off screen saver (which will--eventually blank the screen)...

Code: Select all

apt-get install x11-xserver-utils

sudo xset s off && xset dpms 0 0 0

If you're running outside of Xwindows, insert the following line into /etc/rc.local before the "exit 0" line:

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setterm -blank 0