Second monitor is detected by Wayland/DRM but shows no signal in DriftWM

[icastingspells]

I have a dual-monitor setup on Arch Linux using DriftWM (Wayland compositor).
The second monitor is detected correctly by the system and by Wayland tools, but it receives no signal when running DriftWM.

The monitor appears as enabled, has available modes, and the compositor can place windows on its coordinates, but the physical display remains black / shows "No Signal".

The issue started recently (the monitor was previously working).

System information

driftwm-debug.log

• OS: Arch Linux
• Session type: Wayland
• Compositor: DriftWM
• GPU: AMD Radeon RX 6800
• Kernel driver: amdgpu

Monitor setup

wlr-randr detects both outputs:

DP-2 "Microstep G242L E14 (DP-2)"
Enabled: yes
Modes:
1920x1080 @ 60Hz (current)
1920x1080 @ 144Hz
Position: 0,0
Scale: 1.0

HDMI-A-1 "Microstep MSI MP243X (HDMI-A-1)"
Enabled: yes
Modes:
1920x1080 @ 100Hz (current)
1920x1080 @ 60Hz
Position: -1920,0
Scale: 1.0

DriftWM output configuration

My ~/.config/driftwm/config.toml originally contained:

[[outputs]]
name = "DP-2"
scale = 1.0
mode = "1920x1080@144"
position = [0,0]

[[outputs]]
name = "HDMI-A-1"
scale = 1.0
mode = "1920x1080@100"
position = [-1920,0]

driftwm msg state shows windows correctly distributed across both monitor coordinate spaces:

Alacritty [1288, -1188] 1376x600
v2rayN [-1596, -33] 1200x800
firefox [-285, 1278] 1952x1214
code-oss [1486, 4] 990x1073

[malbiruk]

Please rebuild from the latest main 🙏

[icastingspells]

Please rebuild from the latest main 🙏

Ssory, still the same problem, i tried also this configuration

[[outputs]]
name = "DP-2"
position = [1920,0]

[[outputs]]
name = "HDMI-A-1"
position = [0,0]

but, anyway my second monitor doesn't work
if it helps:
The second monitor works on the lock screen, but as soon as DriftVM starts, the second monitor goes dark, even though the frame indicating that the second monitor is active still appears.

Everything works only if I specify a single monitor like this:

[[outputs]]
name = "DP-2"
position = "auto"

But for me, the positioning for the second monitor isn't right in this case.

Any logs or commands that can help you ?

[malbiruk]

With this config:

[[outputs]]
name = "DP-2"
position = [1920,0]

[[outputs]]
name = "HDMI-A-1"
position = [0,0]

Did you restart driftwm, or just edit the config while it was running? Right now driftwm doesn't fall back to the default mode when you remove mode from the config at runtime and keeps the old mode until a restart or replug (fix in progress). So if a mode was set earlier in the session, later config edits would look like they did nothing.

Two things to try, restarting driftwm after each config change:

1. The config above (without mode lines). Does the monitor light up?
2. mode = "1920x1080@60" for HDMI-A-1. Does it work at 60Hz?

If it stays dark, please paste wlr-randr output while the monitor is dark, that will show which mode driftwm actually picked.

[icastingspells]

With this config:

[[outputs]]
name = "DP-2"
position = [1920,0]

[[outputs]]
name = "HDMI-A-1"
position = [0,0]

Did you restart driftwm, or just edit the config while it was running? Right now driftwm doesn't fall back to the default mode when you remove mode from the config at runtime and keeps the old mode until a restart or replug (fix in progress). So if a mode was set earlier in the session, later config edits would look like they did nothing.

Two things to try, restarting driftwm after each config change:

1. The config above (without mode lines). Does the monitor light up?

2. `mode = "1920x1080@60"` for HDMI-A-1. Does it work at 60Hz?

If it stays dark, please paste wlr-randr output while the monitor is dark, that will show which mode driftwm actually picked.

Yes, it works now with this config after reloading!

[[outputs]]
name = "DP-2"
position = [1920,0]

[[outputs]]
name = "HDMI-A-1"
position = [0,0]

But if I set mode = "1920x1080@100", the second monitor turns off, even though it supports that refresh rate; it's not critical, I'm just sharing the information.
anyway, thankyou for help!