External HDMI monitor detected but no HDMI signal

[a2n]

Hello, I have an external display that work pretty well with Windows so now I want to use it for my work, the screen is detected, I can see it in the config or in the screenshot window I see two desktop for example, but the screen stays black with “no HDMI source”. And the config keep resenting in loop with my other screen blinking, like the pc detect another screen.

My config:

• endeavour os
• kde / wayland
• the screen I want to use is the asus proart PA169CDV
• my pc is a TUXEDO pro gen 8

I try:

• another HDMI cable = same
• another screen with the same HDMI cable the other screen work
• since the log say something about DDC/CI I try to add POWERDEVIL_NO_DDCUTIL=1 but that change nothing
• try to install displaylink because the screen have usb-c but that change nothing either

I don’t know how to debug this situation and I try everything I know to find a solution, so if you have any hint or idea, thanks in advance

Some log and screenshot that can help:

ksyslog

• before the red selection: this is when I plug the screen
• the red selection is the reset
• blue is when I disconnected the HDMI cable
  
  

In lspci I have the screen:

❯ lspci -k                                           
00:00.0 Host bridge: Intel Corporation Raptor Lake-P 6p+8e cores Host Bridge/DRAM Controller
	DeviceName: Onboard - Other
	Subsystem: AIstone Global Limited Device 124a
	Kernel driver in use: igen6_edac
	Kernel modules: igen6_edac
00:02.0 VGA compatible controller: Intel Corporation Raptor Lake-P [Iris Xe Graphics] (rev 04)
	DeviceName: Onboard - Video
	Subsystem: AIstone Global Limited Device 124a
	Kernel driver in use: i915
	Kernel modules: i915, xe
00:06.0 PCI bridge: Intel Corporation Raptor Lake PCIe 4.0 Graphics Port
	Kernel driver in use: pcieport
00:06.2 PCI bridge: Intel Corporation Device a73d
	Kernel driver in use: pcieport
00:07.0 PCI bridge: Intel Corporation Raptor Lake-P Thunderbolt 4 PCI Express Root Port #0
	Subsystem: AIstone Global Limited Device 124a
	Kernel driver in use: pcieport
00:08.0 System peripheral: Intel Corporation GNA Scoring Accelerator module
	DeviceName: Onboard - Other
	Subsystem: AIstone Global Limited Device 124a
00:0a.0 Signal processing controller: Intel Corporation Raptor Lake Crashlog and Telemetry (rev 01)
	DeviceName: Onboard - Other
	Kernel driver in use: intel_vsec
	Kernel modules: intel_vsec
00:0d.0 USB controller: Intel Corporation Raptor Lake-P Thunderbolt 4 USB Controller
	DeviceName: Onboard - Other
	Kernel driver in use: xhci_hcd
00:0d.2 USB controller: Intel Corporation Raptor Lake-P Thunderbolt 4 NHI #0
	DeviceName: Onboard - Other
	Subsystem: Device 2222:1111
	Kernel driver in use: thunderbolt
	Kernel modules: thunderbolt
00:14.0 USB controller: Intel Corporation Alder Lake PCH USB 3.2 xHCI Host Controller (rev 01)
	DeviceName: Onboard - Other
	Subsystem: AIstone Global Limited Device 124a
	Kernel driver in use: xhci_hcd
00:14.2 RAM memory: Intel Corporation Alder Lake PCH Shared SRAM (rev 01)
	DeviceName: Onboard - Other
00:14.3 Network controller: Intel Corporation Raptor Lake PCH CNVi WiFi (rev 01)
	DeviceName: Onboard - Ethernet
	Subsystem: Intel Corporation Device 0074
	Kernel driver in use: iwlwifi
	Kernel modules: iwlwifi
00:15.0 Serial bus controller: Intel Corporation Alder Lake PCH Serial IO I2C Controller #0 (rev 01)
	DeviceName: Onboard - Other
	Subsystem: AIstone Global Limited Device 124a
	Kernel driver in use: intel-lpss
	Kernel modules: intel_lpss_pci
00:16.0 Communication controller: Intel Corporation Alder Lake PCH HECI Controller (rev 01)
	DeviceName: Onboard - Other
	Subsystem: AIstone Global Limited Device 124a
	Kernel driver in use: mei_me
	Kernel modules: mei_me
00:1f.0 ISA bridge: Intel Corporation Raptor Lake LPC/eSPI Controller (rev 01)
	DeviceName: Onboard - Other
	Subsystem: AIstone Global Limited Device 124a
00:1f.3 Audio device: Intel Corporation Raptor Lake-P/U/H cAVS (rev 01)
	DeviceName: Onboard - Sound
	Subsystem: AIstone Global Limited Device 124b
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel, snd_soc_avs, snd_sof_pci_intel_tgl
00:1f.4 SMBus: Intel Corporation Alder Lake PCH-P SMBus Host Controller (rev 01)
	DeviceName: Onboard - Other
	Subsystem: AIstone Global Limited Device 124a
	Kernel driver in use: i801_smbus
	Kernel modules: i2c_i801
00:1f.5 Serial bus controller: Intel Corporation Alder Lake-P PCH SPI Controller (rev 01)
	DeviceName: Onboard - Other
	Subsystem: AIstone Global Limited Device 124a
	Kernel driver in use: intel-spi
	Kernel modules: spi_intel_pci
01:00.0 Non-Volatile memory controller: Kingston Technology Company, Inc. NV1 NVMe SSD [SM2263XT] (DRAM-less) (rev 03)
	Subsystem: Kingston Technology Company, Inc. NV1 NVMe SSD [SM2263XT] (DRAM-less)
	Kernel driver in use: nvme
	Kernel modules: nvme
02:00.0 Non-Volatile memory controller: Kingston Technology Company, Inc. NV1 NVMe SSD [SM2263XT] (DRAM-less) (rev 03)
	Subsystem: Kingston Technology Company, Inc. NV1 NVMe SSD [SM2263XT] (DRAM-less)
	Kernel driver in use: nvme
	Kernel modules: nvme

[a2n]

So in my lunch break I bought a new HDMI cable (4k, high speed), then I ate and all the while the screen was disconnected from the PC, which I had just “locked” with cmd + l.
When I came back from my break, I plugged in the cable and the screen worked, I restarted my PC and here I am back at square one with the exact same problem…

[a2n]

If I close the lid the screen turn on
So I’m thinking this behavior is probably caused by a software problem, no ?

[dusoft]

Rather a config. Check whether you have mirroring or single screen enabled. It sounds like you have a single screen enabled.

[a2n]

Don’t know if you talk about that, but I can’t select anything. Is there any way to get this config via a config file, for example?

[a2n]

Ok that was very weird but your comment work I guess.

I changed to the middle option, then to extend to the right and the screen work now.

This is very weird since when I click on extend to the right nothing change at all

[dusoft]

I am sure you can edit some config file, but using GUI config is easier. I am glad it you have worked it out.