Hi, i am using jetson nano without X11 to run my Qt app on the eglfs platform with egl_kms_egldevice backend. The application works fine on landscape mode, is there any way to set custom resolution to the HDMI output so that i can force it to run at 1080 * 1920 as potrait? or any way to rotate the …

Hi, I think you misunderstand something. Sorry that I didn’t notice that in the beginning. In brief, xrandr does not do the same thing as your Qt app. When you write mode=1080x1920 in Qt, it is actually trying to search 1080x1920 mode in your monitor EDID, and it failed since there is no such mo…

Hi, It depends on whether your Qt application provides any API to rotate the screen through DRM KMS.

Thanks for the reply @WayneWWW , Qt does support custom KMS/DRM configurations via a json file which is read by the Qt app via an environment variable. Please see this link, in the Display Output (EGLFS with eglfs_kms backend) section https://doc.qt.io/qt-5/embedded-linux.html#eglfs It says to ma…

Hi, Please try below command and the device under /dev/dri should be generated. $ sudo modprobe tegra-udrm modeset=1

Hi @WayneWWW , I have tried the command you listed and /dev/dri succesfully popped up with card0 and renderD128 I then tried setting custom KMS/DRM configurations, setting device to card0 { “device”: “/dev/dri/card0”, “hwcursor”: false, “pbuffers”: true, “outputs”: [ { “name”: “HDMI1”, “mod…

Could you share the Qt log in no error case? Just wonder which device does your Qt open in your first try.

which log are you talking about? when running the app without the passing the custom DRM/KMS config json, the app works fine. these are the environment variables that are set. export QT_QPA_EGLFS_HIDECURSOR=0 export QT_QPA_EGLFS_INTEGRATION=eglfs_kms_egldevice after running the app, this is the…

while researching over this issue i saw that one can set custom framebuffer size via fbset … for example "fbset -fb /dev/fb0 -g 1920 1080 1920 1080 32 " looking into it, will reply if i find something.

When you run Qt application, it should print some logs to tell you which device it is trying to open for DRM. We need that log.

when i run my qt application, the only thing that gets printed is Setting framebuffer size is only available with DRM atomic API Unable to query physical screen size, defaulting to 100 dpi. To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters). Is there a…

hmmm, during my last test on Qt5, there should be a log to printed as below thread. [image] QT5.6.3 and KMS/DRM backend is not rendering Jetson TX2 Hi, I have a QApplication on TX2 that renders on HDMI. X11 is completely disabled and not present in system. …

Jetson nano force custom screen resolution over HDMI

Robotics & Edge Computing Jetson Systems Jetson Nano

WayneWWW August 11, 2020, 4:03am 12

hmmm, during my last test on Qt5, there should be a log to printed as below thread.

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Jetson nano force custom screen resolution over HDMI

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