| Bug ID | 105971 |
|---|---|
| Summary | DVI port is not detecting connected monitor with 4.16.0+ kernel and amdgpu.dc=1 set |
| Product | DRI |
| Version | unspecified |
| Hardware | x86-64 (AMD64) |
| OS | Linux (All) |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/AMDgpu |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | sass.joel@gmail.com |
Created attachment 138731 [details]
dmesg output from amdgpu.dc=0 switch
Hello. I'm trying to get 4 monitors working on the same desktop. Video card is
a Radeon RX560.
root@nope:/tmp# lsb_release -a
LSB Version:
core-9.20160110ubuntu0.2-amd64:core-9.20160110ubuntu0.2-noarch:security-9.20160110ubuntu0.2-amd64:security-9.20160110ubuntu0.2-noarch
Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Codename: xenial
root@nope:/tmp# uname -a
Linux nope 4.16.0+ #1 SMP Mon Apr 2 15:52:14 CEST 2018 x86_64 x86_64 x86_64
GNU/Linux
With kernel switch amdgpu.dc=1, DVI port doesn't detected connected monitor,
but displayport MST is detected and utilized properly, allowing me to output
video to three monitors from a single displayport.
With kernel switch amdgpu.dc=0, DVI port properly detects connected monitor,
but displayport MST is not detected. Instead, displayport MST acts as a single
output, and video output is mirrored to all three connected monitors.
This appears to be a kernel issue. Kernel was retrieved from git repo
github.com/M-Bab/linux-kernel-amdgpu-binaries
I'm running the AMDGPU.UBUNTU kernel on that repo.
I'll attach dmesg, xrandr and Xorg.0.log output from both kernel switches.
I'm running amdgpu.dc_log=1 kernel switch for verbose logging.
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