dpms mode change with wayland on iMX.6

[Pintu Agarwal]

On Mon, May 27, 2019 at 12:41 PM Pintu Agarwal <pintu.ping at 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 at lists.freedesktop.org