Video Resolution
Sometimes you may find that the Raspberry Pi does not use the correct video resolution for your monitor. You can set it correctly.
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tvservice -d edid.dat |
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edidparser edid.dat | grep 1080p ======================================= Example output: HDMI:EDID found CEA format: code 16, 1920x1080p @ 60Hz (native) HDMI:EDID found CEA format: code 31, 1920x1080p @ 50Hz HDMI:EDID CEA mode (16) 1920x1080p @ 60 Hz with pixel clock 148 MHz has a score of 211624 HDMI:EDID CEA mode (31) 1920x1080p @ 50 Hz with pixel clock 148 MHz has a score of 128680 ======================================= |
“CEA” corresponds to hdmi_group=1
“DMT” corresponds to hdmi_group=2
The value inside () corresponds to hdmi_mode.
From the above result:
hdmi_group=1
hdmi_mode=16
The file /boot/config.txt has these lines:
#hdmi_group=1
#hdmi_mode=1
As in the case above use sudo nano /boot/config.txt and modify them as required. Don’t forget to remove the # from the lines.
Reboot.
Alternately:
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sudo sed -i "s,#hdmi_group=1,hdmi_group=1," /boot/config.txt sudo sed -i "s,#hdmi_mode=1,hdmi_mode=16," /boot/config.txt sudo reboot |
No Audio via HDMI
If you find that there is no audio output via HDMI then:
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sudo sed -i "s,#hdmi_drive=2,hdmi_drive=2," /boot/config.txt sudo reboot |
Omxplayer Errors
Set the GPU Memory size to 256MB
This is very important. Omxplayer will at times error if you do not do this,
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sudo sed -i "s,gpu_mem=64,gpu_mem=256," /boot/config.txt sudo reboot |
Alternately, use the Raspbian menu preferences>raspberry pi configuration>performance, increase the GPU Memory to 256.