No signal on composite (aka cvbs) output

No signal on composite (aka cvbs) output - Printable Version

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+--- Thread: No signal on composite (aka cvbs) output (/showthread.php?tid=6278)

No signal on composite (aka cvbs) output - Osiander - 07-12-2018

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.

RE: No signal on composite (aka cvbs) output - Osiander - 07-15-2018

After googling aroung, I've checked the /sys/class/drm directory. So here is just HDMI-1:

Quote:root@rock64:~# cd /sys/class/drm/
root@rock64:/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
root@rock64:/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?

RE: No signal on composite (aka cvbs) output - tllim - 07-22-2018

(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:root@rock64:~# cd /sys/class/drm/
root@rock64:/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
root@rock64:/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.

RE: No signal on composite (aka cvbs) output - Osiander - 08-02-2018

No, the problem is different, under /sys/class/drm there is no device for composite output (should be called composite, TV or something similar). I didn't do that.

But, in the meantime, I'm a bit further along. After I modified the DTS file (added an &tve), there is now also a device for composite output:

Code:
root@rock64:~# tree /sys/class/drm/

/sys/class/drm/

|-- card0 -> ../../devices/platform/display-subsystem/drm/card0

|-- card0-HDMI-A-1 -> ../../devices/platform/display-subsystem/drm/card0/card0-HDMI-A-1

|-- card0-TV-1 -> ../../devices/platform/display-subsystem/drm/card0/card0-TV-1

|-- controlD64 -> ../../devices/platform/display-subsystem/drm/controlD64

|-- renderD128 -> ../../devices/platform/display-subsystem/drm/renderD128

-- version

The status of the device is connected:

And I also have that the modes are correct, Rock64 supports for composite only these two:

Code:
root@rock64:# cat /sys/class/drm/card0-TV-1/modes

720x576i50

720x480i60

And I also see that the correct mode is selected (720x576i50):

Code:
root@rock64:# cat /sys/class/drm/card0-TV-1/mode

720x576i50

root@rock64:#

But, I still can't get a picture on the TV. Only the composite cable is connected, no HDMI.

I attached the DTS file and dmesg output.