I'm bought a (notebook) display LP171WP4 (TL)(01) and a display controller. Both are working if I connect it to my Macbook via HDMI. But with the Raspberry PI 3 B it doesn't work. The display is on HDMI but showing 'no signal' on the HDMI channel. If I connect my Raspberry to my TV via HDMI is working fine.
I tried to change different lines in the /boot/config.txt and rebooted after each try without any success.
This is what I've tested:
11I changed the HDMI cable to 1.5 meters as well
Once I don't remember which settings I had, I got a signal, but it was just for a one second followed by several seconds black screen and these two states were repeating, but of course not usable.
Here some debugging info:
$ tvservice -s state 0x12000a [HDMI CEA (16) RGB lim 16:9], 1920x1080 @ 60.00Hz, progressive $ tvservice -n device_name=DWE-HDMI $ tvservice -M Starting to monitor for HDMI events [I] HDMI cable is unplugged [I] HDMI is attached $ tvservice -m CEA Group CEA has 15 modes: mode 1: 640x480 @ 60Hz 4:3, clock:25MHz progressive mode 2: 720x480 @ 60Hz 4:3, clock:27MHz progressive mode 3: 720x480 @ 60Hz 16:9, clock:27MHz progressive mode 4: 1280x720 @ 60Hz 16:9, clock:74MHz progressive mode 5: 1920x1080 @ 60Hz 16:9, clock:74MHz interlaced mode 6: 720x480 @ 60Hz 4:3, clock:27MHz x2 interlaced mode 7: 720x480 @ 60Hz 16:9, clock:27MHz x2 interlaced (prefer) mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive mode 17: 720x576 @ 50Hz 4:3, clock:27MHz progressive mode 18: 720x576 @ 50Hz 16:9, clock:27MHz progressive mode 19: 1280x720 @ 50Hz 16:9, clock:74MHz progressive mode 20: 1920x1080 @ 50Hz 16:9, clock:74MHz interlaced mode 21: 720x576 @ 50Hz 4:3, clock:27MHz x2 interlaced (native) mode 22: 720x576 @ 50Hz 16:9, clock:27MHz x2 interlaced mode 31: 1920x1080 @ 50Hz 16:9, clock:148MHz progressive $tvservice -m DMT Group DMT has 14 modes: mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive mode 6: 640x480 @ 75Hz 4:3, clock:31MHz progressive mode 8: 800x600 @ 56Hz 4:3, clock:36MHz progressive mode 9: 800x600 @ 60Hz 4:3, clock:40MHz progressive mode 10: 800x600 @ 72Hz 4:3, clock:50MHz progressive mode 11: 800x600 @ 75Hz 4:3, clock:49MHz progressive mode 16: 1024x768 @ 60Hz 4:3, clock:65MHz progressive mode 17: 1024x768 @ 70Hz 4:3, clock:75MHz progressive mode 18: 1024x768 @ 75Hz 4:3, clock:78MHz progressive mode 32: 1280x960 @ 60Hz 4:3, clock:108MHz progressive mode 35: 1280x1024 @ 60Hz 5:4, clock:108MHz progressive mode 36: 1280x1024 @ 75Hz 5:4, clock:135MHz progressive mode 47: 1440x900 @ 60Hz 16:10, clock:106MHz progressive mode 85: 1280x720 @ 60Hz 16:9, clock:74MHz progressive
I tried to follow these instructions, part 'The resolution and HDMI modes are not the best values for your screen' and set these values (because I had same result from the edid.txt file:
But that didn't help.
I bough a different controller with VGA and a different monitor which supports similar displays, same result.
- raspberry runs with 3 amps and rasbian-stretch
- display controller runs with 12 volts, 3amps (as recommended)