Arch Linux

Soptik

Member

Registered: 2019-03-11

Posts: 64

[Solved] External monitor is no longer recognized over HDMI

Hi,

I have external monitor that I used to connect to via HDMI. Everything worked out of the box for several months. The last successful try was few weeks ago.

Today, I tried to use my external monitor. But it is not recognized, xrandr doesn't notice it at all.

I've tried;

- replugging everything
- restarting everything (both laptop and monitor, multiple times)
- changing HDMI cable
- replugging everything again
- Manjaro (didn't work)
- Windows 10 (works with both HDMI cables)

I don't really use Manjaro, so I was surprised it wasn't working there, as it wasn't updated in a long time. However I never tried if it even worked in Manjaro in the first place.

There is nothing suspicious in dmesg nor in lspci.

$ lspci -k | grep -iEA5 'vga|3d|display'
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 620 (rev 07)
	Subsystem: Lenovo UHD Graphics 620
	Kernel driver in use: i915
	Kernel modules: i915
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 08)
	Subsystem: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem
--
01:00.0 VGA compatible controller: NVIDIA Corporation GP107M [GeForce GTX 1050 Mobile] (rev a1)
	Subsystem: Lenovo GP107M [GeForce GTX 1050 Mobile]
	Kernel driver in use: nvidia
	Kernel modules: nouveau, nvidia_drm, nvidia
01:00.1 Audio device: NVIDIA Corporation GP107GL High Definition Audio Controller (rev a1)
	Subsystem: Lenovo GP107GL High Definition Audio Controller

Edit: Interesting dmesg entries, I don't know how much they are relevant. There are no new entries after replugging the monitor.

[    4.703126] nvidia-modeset: Version mismatch: nvidia.ko(440.64) nvidia-modeset.ko(440.82)
(...)
[    5.071127] ath10k_pci 0000:02:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[    5.071315] pcieport 0000:00:1c.5: AER: Multiple Corrected error received: 0000:00:1c.5
[    5.071322] pcieport 0000:00:1c.5: AER: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID)
[    5.071324] pcieport 0000:00:1c.5: AER:   device [8086:9d15] error status/mask=00000001/00002000
[    5.071326] pcieport 0000:00:1c.5: AER:    [ 0] RxErr                  (First)
[    5.071331] pcieport 0000:00:1c.5: AER: Multiple Corrected error received: 0000:00:1c.5
[    5.071335] pcieport 0000:00:1c.5: AER: can't find device of ID00e5
(...)
[    5.105821] pcieport 0000:00:1c.5: AER: Multiple Corrected error received: 0000:00:1c.5
[    5.105832] pcieport 0000:00:1c.5: AER: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID)
[    5.105834] pcieport 0000:00:1c.5: AER:   device [8086:9d15] error status/mask=00000041/00002000
[    5.105836] pcieport 0000:00:1c.5: AER:    [ 0] RxErr                  (First)
[    5.105837] pcieport 0000:00:1c.5: AER:    [ 6] BadTLP                
[    5.105842] pcieport 0000:00:1c.5: AER: Multiple Corrected error received: 0000:00:1c.5
[    5.105847] pcieport 0000:00:1c.5: AER: can't find device of ID00e5
(...)

Any ideas on how to debug this?

Thanks

Last edited by Soptik (2020-04-09 10:17:20)

paulkerry

Member

From: Sheffield, UK

Registered: 2014-10-02

Posts: 611

Re: [Solved] External monitor is no longer recognized over HDMI

[    4.703126] nvidia-modeset: Version mismatch: nvidia.ko(440.64) nvidia-modeset.ko(440.82)

That doesn't look right - those version numbers should be the same. Check your linux/nvidia/optimus/whatever packages are installed and setup correctly. Maybe you have done a partial upgrade?

Cheers
Paul

Soptik

Member

Registered: 2019-03-11

Posts: 64

Re: [Solved] External monitor is no longer recognized over HDMI

It looks like this was the issue. Today I installed new update for nvidia and linux and it is solved.

I have no idea how I came up to partial upgrade since I always used -Syu as per instructions on wiki, which shouldn't leave partial updates I think?

Anyway, thanks a lot!