Custom 3840x1100 resolution?

[keimol]

Hey everyone,

Has anyone managed to get the N2 to output a 3840x1100 resolution? I've tried several modelines but they seem to be rejected by the drm system:

Code: Select all

User-defined mode not supported: "3840x1100": 30 133850 3840 3888 3920 4000 1100 1103 1113 1119 0x20 0x9

Some of the modelines I've tried:

Code: Select all

# Grabbed from EDID, doesn't work
xrandr --newmode "3840x1100_60.00"    282.89  3840 3888 3920 4100  1100 1103 1108 1150 +hsync -vsync
xrandr --addmode HDMI-1 "3840x1100_60.00"

# Doesn't work
xrandr --newmode "3840x1100_30.00"    163.50  3840 3968 4352 4864  1100 1103 1113 1122 -hsync +vsync
xrandr --addmode HDMI-1 "3840x1100_30.00"

# Works but image is very unstable with all kinds of flaky errors
xrandr --newmode "1920x550_60.00"   83.25  1920 1984 2176 2432  550 553 563 572 -hsync +vsync
xrandr --addmode HDMI-1 "1920x550_60.00"

Running Armbian with Linux odroidn2 6.1.11-meson64 #23.02.2 SMP PREEMPT Sat Feb 18 00:07:55 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux.

[odroid]

As far as I know, Amlogic HDMI/DRM drivers in the mainline kernel has some limitation for customizing the timings.
You might need to use this method on old kernel 4.9 and port the missing items to the mainline kernel driver.
https://wiki.odroid.com/odroid-n2/appli ... splay_mode