SK-TDA4VM: How to change DP resolution

JB LIM

Intellectual 255 points

Part Number: SK-TDA4VM

Tool/software:

Hi TI Team,

Is there any way to change DP resolution, with linux command or config?

I run Edge AI gallery(Demo app), using ti-processor-sdk-linux-edgeai-j721e-evm-09_01_00_06-Linux-x86.bin.

BRs,

3 months ago

0 Brijesh Jadav 3 months ago

TI__Guru**** 427915 points

Hi JB,

Not exactly, but isn't it possible to change it using modeline command in Linux?

Regards,

Brijesh

0 JB LIM 3 months ago in reply to Brijesh Jadav

Intellectual 255 points

Hi, Brijesh

I'm sorry but I'm not familiar with modeline.
Would you please guide me how to change resolution using modeline command?

Regards,

0 Brijesh Jadav 3 months ago in reply to JB LIM

TI__Guru**** 427915 points

Hi JB,

Me neither, let me check with Linux expert Takuma Fujiwara.

Regards,

Brijesh

0 Takuma Fujiwara 3 months ago in reply to Brijesh Jadav

TI__Mastermind 34752 points

Hi Brijesh, JB,

Apologies for the late reply.

If using EdgeAI, it can switch between weston/wayland and kmssink (default is kmssink). Resolution of weston display can be changed by editing the weston.ini file. Procedure would look like the following:

Run "modetest -M tidss -c" and note the 'name' of the connector, and the different supported resolutions under 'modes'
"vi /etc/xdg/weston/weston.ini"
Add '[output]' for connector with a specified mode. An example when using DP-1 and setting it to 800x600 would look like:
[output]
name=DP-1
mode=800x600
"systemctl restart weston"

Any subsequent boot will automatically read from weston.ini and apply the settings there.

Regards,

Takuma

0 JB LIM 3 months ago in reply to Takuma Fujiwara

Intellectual 255 points

Hi, Takuma

Thanks for your answer.

I have already changed a resolution of weston display as you guided.

I want to change a resolution on kmsssink. Is it possible?

Regards,

0 Takuma Fujiwara 3 months ago in reply to JB LIM

TI__Mastermind 34752 points

Hi JB,

If you are using GStreamer and using kmssink, then you could put a capsfilter like this:

gst-launch-1.0 videotestsrc ! video/x-raw, width=1920, height=1080 ! kmssink driver-name=tidss sync=true

Where width and height can be changed to the resolution of your liking.

Regards,

Takuma

0 JB LIM 3 months ago in reply to Takuma Fujiwara

Intellectual 255 points

Hi, Takuma

I want to change the resolution of the screen(monitor), not the resolution of videotestsrc(gstreamer source).

There is a screen flickering issue on 4K monitor, when connected DP.

Please refer to the following issue,

SK-TDA4VM: flickering every 5 sec when connected DP, - Processors forum - Processors - TI E2E support forums

Regards,

0 Takuma Fujiwara 3 months ago in reply to JB LIM

TI__Mastermind 34752 points

Hi JB,

I have not figured out a way to saveenv, but setting kernel commandline seems to do the trick.

When booting, hit any keys to stop in U-Boot. Then run following commands:
run finduuid
setenv args_mmc "run finduuid;setenv bootargs console=${console} ${optargs} root=PARTUUID=${uuid} rw rootfstype=${mmcrootfstype} video=DP-1:800x600@60"
boot

Key is the last portion of step 3 which sets "video=DP-1:800x600@60". The connector name, resolutions, and fps can be obtained by running "modetest -M tidss -c" in Linux kernel instead of U-Boot.

Regards,

Takuma