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root@arm:~# cd /sys/class/drm/card0/card0-HDMI-A-1
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root@arm:/sys/class/drm/card0/card0-HDMI-A-1# parse-edid edid
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^C
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root@arm:/sys/class/drm/card0/card0-HDMI-A-1# cat edid
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▒▒▒▒▒▒A
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▒▒▒▒,x*▒VQ▒'
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PT▒K▒▒▒▒▒0*@▒`▒d0P▒▒▒UK01303059530▒Philips 206V4▒8LS
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      Jroot@arm:/sys/class/drm/card0/card0-HDMI-A-1# ls
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device  dpms  edid  enabled  modes  power  status  subsystem  uevent
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root@arm:/sys/class/drm/card0/card0-HDMI-A-1# cat modes
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1280x1024
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1280x720
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1024x768
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1024x768
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800x600
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800x600
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640x480
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640x480
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640x480
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640x480
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720x400
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root@arm:/sys/class/drm/card0/card0-HDMI-A-1#
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root@arm:/sys/class/drm/card0/card0-HDMI-A-1#
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root@arm:/sys/class/drm/card0/card0-HDMI-A-1# xrandr -display :0.0 -q
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Can't open display :0.0
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root@arm:/sys/class/drm/card0/card0-HDMI-A-1# xrandr -display :0.0 --output HDMI-0 --mode 1024x768 --rate 60
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Can't open display :0.0