I’ve got one of the Chalkboard Electronics 7" touchscreens that I’d like to use with my Jetson TK1. It works, but not at full resolution (1280x800). The best I can do is 1280x720. It looks like a number of others have tried this, but so far I haven’t seen any complete successes.
In my case, the EDID information is correct (I flashed the latest firmware, and the resolution option shows up), and the display works at full resolution using HDMI from my desktop (NVIDIA GT 640). But on the Jetson, the screen goes black when I try to select that resolution. I get the follwing output from dmesg:
[ 1456.109989] tegradc tegradc.1: nominal-pclk:82176000 parent:244000000 div:3.0 pclk:81333333 81354240~89571840
[ 1456.109992] tegradc tegradc.1: pclk out of range!
[ 1456.117856] tegradc tegradc.1: nominal-pclk:82176000 parent:244000000 div:3.0 pclk:81333333 81354240~89571840
[ 1456.117859] tegradc tegradc.1: pclk out of range!
It seems that somehow the Jetson can’t display 1280x800, or maybe that the pixel clock is wrong somehow. I am not sure where to continue debugging this. Any clues, or log files I should be looking at?
Thanks!