Debian on BPi-M7 display resolution and resyncing issue on Viewsonic VX3276-2K-MHD

[AaronNGray]

With Debian Bookworm on BananaPi-M7 when Viewsonic VX3276-2K-MHD WQHD 2560x1440 the display is the wrong resolution only supporting upto 1920x1080 or 2560x1080 for ViewSonic 32” monitor config.

It also fails to resync when turned off and on again or another source is selected on and the BPi-M7 is reselected, resulting in a flickering white backgound.

 

Armbian_25.2.1_Bananapim7_bookworm_vendor_6.1.99_xfce_desktop.img

with apt-get update & apt-get upgrade

Armbian 25.2.3 bookworm 12

Linux bananapim7 6.1.99-vendor-rk35xx

 

Ubuntu works fine and supports the Viewsonic VX3276-2K-MHD WQHD on 2560x1440 for this but has a display area issue when changing the scaling where 3/4 of the screen is black on x2. I will file this separately.

Armbian_25.2.1_Bananapim7_noble_current_6.12.13_xfce_desktop.img

with apt-get update & apt-get upgrade

Armbian 25.2.3 noble 24.04

 

https://armbian.atlassian.net/jira/software/c/projects/AR/issues/AR-2641?jql=project %3D "AR" ORDER BY created DESC

[AaronNGray]

@Igor @amazingfate I would appreciate a fix or any guidance on this issue please.

Edited March 26 by AaronNGray

[amazingfate]

Hi,

There are differences between the bookworm and noble images:

- bookworm is running vendor 6.1.99 kernel which is from rockchip's sdk, while noble is running mainline 6.12.13. The SDK kernel may have issues detecting screen resolution, you may wait for a new version 6.1.115 to see if the issue is fixed.

- bookworm should be running without gpu driver, you can check it by command "dpkg -l|grep libgl1-mesa-dri", if the version is lower than 24.1, the gpu is not drived, you can try bookworm image built with mesa-vpu extension for example the cinnamon one: https://dl.armbian.com/bananapim7/Bookworm_current_cinnamon-backported-mesa

- You are running both images with xfce desktop, so the scaling issue may be desktop environment related, usually wayland session(such as gnome wayland) has better support on HiDPI screens.