Jetson NX DP-port only have low resolution and cann't change it

[chang-quan]

when nx connet to monitor use dp port,the only have low resolution and cannt change it.I tried system setting and xrandr setting to change the resolution ,but both failed.
In the system setting ,don’t have any other selection except 800x600.
When i use xrandr ,could add high resolution mode ,but cant work in high resulotion.
so how can I solve the problem? I think the nvidia driver is broken,but I cannt reinstall the driver
that like in the PC, so Is guide to reinstall nvidia display driver under jetson ?

[TomNVIDIA]

Hi,

This is posted in the wrong category. I will move your topic over to the Jetson Xavier NX forum for visibility.

Cheers,
Tom K

[linuxdev]

To get an expanded explanation of what the driver thinks of each mode you can edit “/etc/X11/xorg.conf”. Find Section "Device" and add Option "ModeDebug":

Section "Device"
   Option "ModeDebug"

Then reboot and check the most recent Xorg log. To find this:
ls -ltr /var/log/Xorg.*.log | tail -n 1

Attach a copy of that to the forum. It’ll give detailed information from EDID about the modes it accepts (or rejects). The driver only accepts EDID modes.

[chang-quan]

I have followed your advice，and get the log.
Xorg.0.log (221.3 KB)

[WayneWWW]

Please share the dmesg too.

[linuxdev]

For reference, these are the valid modes which the driver accepts (there are other EDID modes listed, but not accepted…the log explains why each of those modes were rejected):

[    43.276] (II) NVIDIA(GPU-0): --- Modes in ModePool for DELL E2417H (DFP-0) ---
[    43.276] (II) NVIDIA(GPU-0): "nvidia-auto-select" :  800 x  600 @  75.0 Hz  (from: EDID)
[    43.276] (II) NVIDIA(GPU-0): "800x600"            :  800 x  600 @  75.0 Hz  (from: EDID)
[    43.276] (II) NVIDIA(GPU-0): "800x600_75"         :  800 x  600 @  75.0 Hz  (from: EDID)
[    43.276] (II) NVIDIA(GPU-0): "800x600_60"         :  800 x  600 @  60.3 Hz  (from: EDID)
[    43.276] (II) NVIDIA(GPU-0): "720x400"            :  720 x  400 @  70.0 Hz  (from: EDID)
[    43.276] (II) NVIDIA(GPU-0): "720x400_70"         :  720 x  400 @  70.0 Hz  (from: EDID)
[    43.276] (II) NVIDIA(GPU-0): "640x480"            :  640 x  480 @  75.0 Hz  (from: EDID)
[    43.276] (II) NVIDIA(GPU-0): "640x480_75"         :  640 x  480 @  75.0 Hz  (from: EDID)
[    43.276] (II) NVIDIA(GPU-0): "640x480_60"         :  640 x  480 @  59.9 Hz  (from: EDID)
[    43.276] (II) NVIDIA(GPU-0): --- End of ModePool for DELL E2417H (DFP-0): ---

The dmesg log requested by @WayneWWW might add more information.

[chang-quan]

Sorry, I’m on a business trip these days, so I forgot to reply.
I upload the file now. @WayneWWW @linuxdev
dmesg.log (103.6 KB)

[WayneWWW]

Is this a xavier NX devkit or not?

Also, did you set anything with 1280x720 resolution? Your xorg log says

Mode is rejected: Mode (1920 x 1080) is too large for
[ 42.646] (WW) NVIDIA(GPU-0): user-requested virtual screen size (1280 x 720

Did you ever request such resolution?

[chang-quan]

Under you guide ,I find the reason. I changed the resolution ,In order to use VNC remote software.Now ,I delect the modify in /etc/X11/xorg.conf.and the display become normal.
thanks.