There is a way to force the HDMI while it is running. Do a google,search for: beaglebone HDMI Here is an excerpt:
Forcing A Resolution It is possible to force a resolution to be used by the board. The availble resolutions will however, be limited to those that have been determined to work by the DRM manager on the board. As a result, not all resolutions that can be supported by the display are available. But, it will allow you to try other resolutions. Equipment You will need the following items: 1) FTDI Serial Cable 2) Putty, Teraterm, or similar terminal emulation software. Process 1) Connect the serial cable to your PC. 2) Launch the terminal emulation SW and select the correct serial port. 3) Connect the serial cable to the serial debug connector on the board. 4) Connect the HDMI cable to the board and your display. 5) Apply power to the board. 6) You should see messages appear on the terminal. 7) When the login prompt appears type root and hit enter. 8) Type export XAUTHORITY=`ls /var/run/gdm/auth-for-root-*/database` and hit enter. 9) Type export DISPLAY=:0.0 and hit enter. 10) Type xrandr --output HDMI-0 --mode 720x480 --rate 60. You can substitute different resolutions and refresh rates if you like. Hit enter. The resolution should change on the display. If you get the message "xrandr: cannot find mode 1920x1080" where the 1920x1080 in this example is the mode you selected, that means that the DRM driver did not select it as an available resolution. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
