Occasionally, when I power up my friendly RPi, the screen stays blank as if there is no output from the HDMI. I can still ssh to the device, so it is working.
Can anyone suggest reasons why it may be happening and how to fix it?
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Are you sure it is just the HDMI output? Have you tried connecting to it with ssh? – finnw Jun 16 '12 at 22:36
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1@finnw I'm sure. I'm connected to it via ssh right now and it's also connected to a blank screen. – Jivings Jun 16 '12 at 22:38
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Now it seems to have stopped working completely... – Jivings Jun 17 '12 at 07:34
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This was due to incorrect settings in /boot/config.txt.
Actually deleting the config file solved my issue, but its purpose and possible parameters are documented here.
The contents of my file were:
hdmi_mode=19
#arm_freq=800
disable_overscan=1
This is what comes by default in Arch. The hdmi_mode=19 setting sets the HDMI output to 1024x768 85Hz, which is apparently an unsupported resolution for my monitor.
I believe that deleting the file sets the output to hdmi_mode=1, which is VGA. Clearly this is suboptimal, so I recommend experimenting to find the best value.
Jivings
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Another possibility I came across is that I didn't get any display unless the HDMI cable was plugged in before the Pi was switched on.
Should be a relatively quick one to fault-find, but worth documenting here nonetheless.
berry120
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1Could this be solved by using the
hdmi_force_hotplug=1option as documented on http://elinux.org/RPiconfig? – Lekensteyn May 13 '13 at 21:40