Fixing Intermittent or No Output to an HDMI Monitor

Certain HDMI monitors show no output or intermittent output from a startx & command. This condition occurs because the SoC and monitor are set to different pixel clock rates, even though they are set to the same refresh rate.

The FPDLink III-to-DVI adapter box used to connect to displays has a maximum pixel clock of 170 MHz. Therefore, to correct this problem, you must set the SoC to a display mode that uses a pixel clock of less than 170 MHz. For example, enter the following command to see the supported resolutions and pixel clocks:

xrandr -d :0 --verbose

Set the resolution of the monitor using the identifier from the previous command with the following command for the HDMI-0 port:

xrandr --output HDMI-0 --mode 0x18f