On Mon, May 27, 2019 at 3:42 PM Pintu Agarwal pintu.ping@gmail.com wrote:

On Mon, May 27, 2019 at 12:41 PM Pintu Agarwal pintu.ping@gmail.com wrote:

...

Dear All,

I have a iMX.6 (arm 32) board with Linux Kernel 3.10 and debian platform running. The board is connected to one LCD screen and one HDMI monitor. It have DRM + Wayland setup for display. Also, I noticed that it have two dri interface: /dev/dri/card0 /dev/dri/card1

I am not very familiar with Linux Graphics/Display subsystem, so I am looking for some help here.

My requirement is that I have turn off HDMI display screen using a command line utility or test program. I learn that for X-server we can use xset : xset dpms force off (and it works on my ubuntu desktop with 16.04).

However this command does not exists on my board. So, my question is: Is there any equivalent DPMS commands for Wayland/Wetson?

---

Further, in order to explore more, I cloned libdrm code from here: url = https://gitlab.freedesktop.org/mesa/drm

Then I found some test utility under: drm/tests folder. After exploring more, and few modification, somehow I could able to cross-compile "proptest" for my board using below: arm-linux-gnueabi-gcc -o proptest.out proptest.c -I./target/libdrm_include/ -L./target/libdrm_lib/ -ldrm

I found that "/dev/dri/card0" is not working with this test. So, I changed the test utility like this: fd = drmOpen("imx-drm", NULL); OR fd = open("/dev/dri/card1", O_RDWR);

When I default run it on my board, I see that "Connector_id: 29" is showing for the HDMI display and it can support DPMS property. {{{ Connector 29 (11-1) 1 EDID: flags: immutable blob blobs:

            value:
                 XXXXXXX
    2 DPMS:
            flags: enum
            enums: On=0 Standby=1 Suspend=2 Off=3
            value: 0

CRTC 24 CRTC 27 }}}

Then, when I try to run it using below command: # ./proptest.out 29 connector 2 3

The program just returns successfully without any errors, but nothing happens. The display does not turns off. I saw that in my kernel 3.10 the ioctl(DRM_IOCTL_MODE_SETPROPERTY) is already supported under DRM.

So, I am wondering what is the right way to verify DPMS mode property on wayland ?

If anybody have any suggestions, please help me.

Thanks, Pintu

• etnaviv@lists.freedesktop.org

One more point: Although it is having Kernel 3.10, but the DRM modules were upgraded to Kernel 4.9.xx from mainline. So, latest DRM changes are already applied.

Thanks, Pintu