dpms mode change with wayland on iMX.6

[Pintu Agarwal]

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


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