DP monitor detected, but won't display anything

abdulhakeem · 2021-05-27 00:27:03

* Ryzen 5600X
* RX 580
* KDE Plasma

I've got a total of 3 monitors:

* Primary ASUS monitor (DP) - 1920x1080 @ 165Hz
* Secondary Dell monitor (DP) - 1680x1050 @ 60Hz
* Tertiary sensor panel (HDMI) - 1280x720 @ 60Hz

The primary and tertiary monitors work just fine, but for some reason, the Dell monitor won't actually display anything despite being detected. It just flickers back and forth between "No signal - power saving" and a blank black screen. KDE System Settings > Display Configuration and `arandr` both detect the monitor, just won't actually show any video output.

This is a dual-boot system, monitor works fine during boot motherboard splash, BIOS/UEFI, in Windows, and in GRUB; it's only once Arch is booted that the monitor stops working. Issue also occurs in the Ubuntu Live ISO, so definitely seems to be a Linux-specific issue.

Tried in both X11 and Wayland but same thing occurs in both.

I've got `mesa` installed which AFAIK should have the AMDGPU driver built-in, so I'm not sure if I'm missing anything as far as drivers.

I did just install `plasma` and `sddm` straightaway without manually getting xorg installed first (figured xorg would just get installed along with plasma) so I don't know if maybe there's some xorg-related packages that perhaps I'm missing? But with other systems when I've just installed either GNOME or KDE and enabled the relevant Display Manager, it always worked fine before.

I also found [this post](https://unix.stackexchange.com/question … -arch-linu) and tried adding the kernel parameter that was mentioned `amdgpu.dc=0` but it had no effect.

Because it only happens when specifically when Linux is booted I'm thinking it's gotta be some sort of driver issue right? But I don't know what I'm missing. Maybe I should try switching to the AMDGPU-PRO driver? Haven't tried that yet.

This is the output from my xrandr but I'm not sure what I'm looking for:

Screen 0: minimum 320 x 200, current 3600 x 1800, maximum 16384 x 16384
DP-1 connected primary 1920x1080+1680+0 (normal left inverted right x axis y axis) 531mm x 299mm
1920x1080 119.98 + 164.92* 60.01 144.00 59.97 99.93 84.90 59.96 60.00 50.00 59.94 59.93
1920x1080i 60.00 50.00 59.94
1680x1050 59.95 59.88
1400x1050 74.76 59.98
1600x900 59.99 59.94 59.95 59.82
1280x1024 85.02 75.02 60.02
1440x900 59.89
1400x900 59.96 59.88
1280x960 85.00 60.00
1440x810 60.00 59.97
1368x768 59.88 59.85
1280x800 59.99 59.97 59.81 59.91
1152x864 75.00
1280x720 60.00 59.99 59.86 60.00 50.00 59.94 59.74
1024x768 85.00 75.05 60.04 85.00 75.03 70.07 60.00
1024x768i 86.96
960x720 85.00 75.00 60.00
928x696 75.00 60.05
896x672 75.05 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
832x624 74.55
960x540 59.96 59.99 59.63 59.82
800x600 85.00 75.00 70.00 65.00 60.00 85.14 72.19 75.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
720x576 50.00
700x525 74.76 59.98
800x450 59.95 59.82
720x480 60.00 59.94
640x512 85.02 75.02 60.02
700x450 59.96 59.88
640x480 85.09 60.00 85.01 75.00 72.81 75.00 66.67 60.00 59.94
720x405 59.51 58.99
720x400 85.04 70.08
684x384 59.88 59.85
640x400 59.88 59.98 85.08
576x432 75.00
640x360 59.86 59.83 59.84 59.32
640x350 85.08
512x384 85.00 75.03 70.07 60.00
512x384i 87.06
512x288 60.00 59.92
416x312 74.66
480x270 59.63 59.82
400x300 85.27 72.19 75.12 60.32 56.34
432x243 59.92 59.57
320x240 85.18 72.81 75.00 60.05
360x202 59.51 59.13
360x200 85.04
320x200 85.27
320x180 59.84 59.32
320x175 85.27
DP-2 connected 1680x1050+0+15 (normal left inverted right x axis y axis) 473mm x 296mm
1680x1050 59.95*+
1280x1024 75.02 60.02
1152x864 75.00
1024x768 75.03 60.00
800x600 75.00 60.32
640x480 75.00 59.94
720x400 70.08
HDMI-1 connected 1280x720+1156+1080 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1080 60.00 + 59.96 50.00 59.94 59.93
1920x1200 59.95
1920x1080i 60.00 50.00 59.94
1600x1200 65.00 60.00
1680x1050 59.95 59.88
1400x1050 74.76 59.98
1600x900 59.95 59.82
1280x1024 75.02 60.02
1400x900 59.96 59.88
1280x960 60.00
1440x810 59.97
1368x768 59.88 59.85
1280x800 59.99 59.97 59.81 59.91
1152x864 75.00
1280x720 60.00 59.99 59.86 60.00* 50.00 59.94 59.74
1024x768 75.05 60.04 75.03 70.07 60.00
960x720 75.00 60.00
928x696 75.00 60.05
896x672 75.05 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
832x624 74.55
960x540 59.96 59.99 59.63 59.82
800x600 75.00 70.00 65.00 60.00 72.19 75.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
720x576 50.00
720x576i 50.00
700x525 74.76 59.98
800x450 59.95 59.82
720x480 60.00 59.94
720x480i 60.00 59.94
640x512 75.02 60.02
700x450 59.96 59.88
640x480 60.00 75.00 72.81 75.00 60.00 59.94
720x405 59.51 58.99
720x400 70.08
684x384 59.88 59.85
640x400 59.88 59.98
576x432 75.00
640x360 59.86 59.83 59.84 59.32
512x384 75.03 70.07 60.00
512x288 60.00 59.92
416x312 74.66
480x270 59.63 59.82
400x300 72.19 75.12 60.32 56.34
432x243 59.92 59.57
320x240 72.81 75.00 60.05
360x202 59.51 59.13
320x180 59.84 59.32
HDMI-2 disconnected (normal left inverted right x axis y axis)
DVI-D-1 disconnected (normal left inverted right x axis y axis)

Anyone got any suggestions?

seth · 2021-05-27 05:54:51

Please wrap the xrandr output in "code" tags, https://bbs.archlinux.org/help.php#bbcode

This is a dual-boot system, monitor works fine during boot motherboard splash, BIOS/UEFI, in Windows, and in GRUB

Mandatory read: 3rd link in my signature.

amdgpu-pro only provides some different GL libraries and is more likely to break something that fixing this one.

Does

xrandr --output DP1 --mode 1024x768 --rate 60 --output DP-2 --mode 1024x768 --rate 60

help?

tried adding the kernel parameter that was mentioned `amdgpu.dc=0` but it had no effect.

Rather try

amdgpu.dpm=0 amdgpu.runpm=0 amdgpu.bapm=0

especially if the above lowering of resolution and frequency helped.

Last but not least: are there any adapters involved? Have you tried swapping the cables?

Arch Linux

#1 2021-05-27 00:27:03

DP monitor detected, but won't display anything

#2 2021-05-27 05:54:51

Re: DP monitor detected, but won't display anything

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