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No signal on composite (aka cvbs) output
#1
Hello guys,

so, today I've make a adapter cable for video output, like described in this thread (tip = shield and first ring is video signal) and conntected them to my Rock64 and my DELL 2007FP.

After power on........ nothing. So picture on the monitor....

Do I have to setup something else?


I'm using Debian Stretch 0.6.44. If I connect the board per HDMI, I get the signal.

All logs (u-boot, printenv and boot) are attached.

Many thanks.


Attached Files
.log   boot.log (Size: 43.92 KB / Downloads: 3)
.log   printenv.log (Size: 3.9 KB / Downloads: 6)
.log   u-boot.log (Size: 1.31 KB / Downloads: 4)
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#2
After googling aroung, I've checked the /sys/class/drm directory. So here is just HDMI-1:

Quote:[email protected]:~# cd /sys/class/drm/
[email protected]:/sys/class/drm# ll
total 0
drwxr-xr-x  2 root root    0 Jul 15 17:51 .
drwxr-xr-x 64 root root    0 Jul 15 17:51 ..
lrwxrwxrwx  1 root root    0 Jul 15 17:51 card0 -> ../../devices/platform/display-subsystem/drm/card0
lrwxrwxrwx  1 root root    0 Jul 15 17:51 card0-HDMI-A-1 -> ../../devices/platform/display-subsystem/drm/card0/card0-HDMI-A-1
lrwxrwxrwx  1 root root    0 Jul 15 17:51 controlD64 -> ../../devices/platform/display-subsystem/drm/controlD64
lrwxrwxrwx  1 root root    0 Jul 15 17:51 renderD128 -> ../../devices/platform/display-subsystem/drm/renderD128
-r--r--r--  1 root root 4096 Jul 15 17:51 version
[email protected]:/sys/class/drm#

So, I think here is my problem, here should be "card0-Composite-1" or something like that... It looks like Rock64 didn't recognize CVBS output...

Any ideas?
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#3
(07-15-2018, 11:57 AM)Osiander Wrote: After googling aroung, I've checked the /sys/class/drm directory. So here is just HDMI-1:

Quote:[email protected]:~# cd /sys/class/drm/
[email protected]:/sys/class/drm# ll
total 0
drwxr-xr-x  2 root root    0 Jul 15 17:51 .
drwxr-xr-x 64 root root    0 Jul 15 17:51 ..
lrwxrwxrwx  1 root root    0 Jul 15 17:51 card0 -> ../../devices/platform/display-subsystem/drm/card0
lrwxrwxrwx  1 root root    0 Jul 15 17:51 card0-HDMI-A-1 -> ../../devices/platform/display-subsystem/drm/card0/card0-HDMI-A-1
lrwxrwxrwx  1 root root    0 Jul 15 17:51 controlD64 -> ../../devices/platform/display-subsystem/drm/controlD64
lrwxrwxrwx  1 root root    0 Jul 15 17:51 renderD128 -> ../../devices/platform/display-subsystem/drm/renderD128
-r--r--r--  1 root root 4096 Jul 15 17:51 version
[email protected]:/sys/class/drm#

So, I think here is my problem, here should be "card0-Composite-1" or something like that... It looks like Rock64 didn't recognize CVBS output...

Any ideas?

If both HDMI and CVBS plug in at the same time, I thinks the video route to HDMI output. Just unplug the HDMI cable form ROCK64 board and keep the AV cable plugin,  there may be CVBS output.
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