I installed the latest Armbian image and used a 1080P portable monitor to finish the install process.

 

But when I use my bigger monitor with 2560x1440 resolution, it cannot output signal via HDMI.

 

I searched about it, but most of them are about windows/x86 contents.

 

Any idea about that?

Hi! Did you tries this https://docs.armbian.com/User-Guide_Fine-Tuning/#screen-resolution-within-xorg?

Does not work for the Rock5B.

$ cvt 2560 1440 30
# 2560x1440 29.94 Hz (CVT) hsync: 43.95 kHz; pclk: 146.25 MHz
Modeline "2560x1440_30.00"  146.25  2560 2680 2944 3328  1440 1443 1448 1468 -hsync +vsync
$ xrandr --newmode "2560x1440_30.00"  146.25  2560 2680 2944 3328  1440 1443 1448 1468 -hsync +vsync
$ xrandr --addmode HDMI-1 "2560x1440_30.00"
$ xrandr --output HDMI-1 --mode 2560x1440_30.00
xrandr: Configure crtc 0 failed
# dmesg
<cut irrelevant messages>
[527761.070776] rockchip-vop2 fdd90000.vop: [drm:vop2_crtc_atomic_disable] Crtc atomic disable vp0
[527761.140128] dwhdmi-rockchip fde80000.hdmi: use tmds mode
[527761.140179] rockchip-vop2 fdd90000.vop: [drm:vop2_crtc_atomic_enable] Update mode to 1920x1080p60, type: 11(if:800) for vp0 dclk: 148500000
[527761.140714] rockchip-vop2 fdd90000.vop: [drm:vop2_crtc_atomic_enable] dclk_out0 div: 0 dclk_core0 div: 2
[527761.140730] rockchip-vop2 fdd90000.vop: [drm:vop2_crtc_atomic_enable] set dclk_vop0 to 148500000, get 148500000
[527761.157566] rockchip-hdptx-phy-hdmi fed60000.hdmiphy: hdptx_ropll_cmn_config bus_width:16a8c8 rate:1485000
[527761.157865] rockchip-hdptx-phy-hdmi fed60000.hdmiphy: hdptx phy pll locked!
[527761.157898] dwhdmi-rockchip fde80000.hdmi: final tmdsclk = 148500000
[527761.161610] dwhdmi-rockchip fde80000.hdmi: don't use dsc mode
[527761.161618] dwhdmi-rockchip fde80000.hdmi: dw hdmi qp use tmds mode
[527761.161628] rockchip-hdptx-phy-hdmi fed60000.hdmiphy: bus_width:0x16a8c8,bit_rate:1485000
[527761.161835] rockchip-hdptx-phy-hdmi fed60000.hdmiphy: hdptx phy lane locked!
[527761.240961] dwhdmi-rockchip fde80000.hdmi: use tmds mode

I think you have a better change by adding a screen resolution in the DTS.

 

On the radxa forum someone has tried it (8's post):

https://forum.radxa.com/t/ubuntu-image-with-x11-and-resolution-2560x1440/12553

I had no change to test it yet.

Edited January 9, 20233 yr by specs

I have same issues setting correct resolution on 5 inch 800x480 screen.

I found a workaround in this this topic:

Maybe someone knows better solution how to fix detection and setting proper resolution automatically?
EDID seems to be right, because it worked on previous OS.

Edited January 19, 20233 yr by Roman Khudobei

14 часов назад, Roman Khudobei сказал:

EDID seems to be right, because it worked on previous OS.

Hello, so if my solution did help you it means that EDID should be ok, because that how it was in my case, problem is somewhere in hdmi driver.

 

IDK what kernel is used for ROCK 5B, but if it's possible - try balbes150 media kernel - with it i don't need my fix on some of the screens

I have a similar issue where one of my screens never lights up when armbian boots. What i found is that the problem is not present on older builds using the 5.10.72 and 5.10.66 kernel versions.

 

my screen is 1920x1080@60 and EDID negotiation seem ok

Edited March 5, 20233 yr by Kenneth Ekman

I have tried a balbes150 build, which uses the 5.10.110 kernel and has the same problem, although I am not sure if the "media kernel" is something special?

 

 

Edited March 7, 20233 yr by Kenneth Ekman

Here are my other threads for this issue 

 

https://forum.radxa.com/t/after-apt-upgrade-the-screen-gui-doesnt-start/15030/

 

 

@Roman KhudobeiI have tried the media kernel from balbes150 and it works fine with my newer Dell screen, but the older BENQ screen is always black with that kernel too.

 

The BENQ screen works ok with the 5.10.66 and 5.10.72 kernel builds.