Bug 198921

Summary:	amdgpu - dc module conflict - does not detect 2560x1080 resolution anymore - RX460
Product:	Drivers	Reporter:	cyril.raphanel
Component:	Video(Other)	Assignee:	drivers_video-other
Status:	RESOLVED CODE_FIX
Severity:	normal	CC:	cyril.raphanel
Priority:	P1
Hardware:	x86-64
OS:	Linux
URL:	https://bbs.archlinux.org/viewtopic.php?pid=1770161#p1770161
Kernel Version:	4.15.5	Subsystem:
Regression:	Yes	Bisected commit-id:

Description cyril.raphanel 2018-02-24 17:21:46 UTC

Hi,

I had to disable the dc module from the kernel (amdgpu.dc=0) in order to get back my 2560x1080 resolution otherwise it was stuck in 1920x1080.

2560x1080 was not detected and trying to add it manually using cvt and xrand did not work I got:
xrandr: Configure crtc 0 failed

I am using DVI-D connection with a RX460 graphic card.

Thanks for your great work!

Comment 1 cyril.raphanel 2018-03-21 07:24:02 UTC

Related/similar bug opened in freedesktop list 
https://bugs.freedesktop.org/show_bug.cgi?id=103953

I will check if solved in 4.16 when it goes stable.

Comment 2 cyril.raphanel 2018-04-20 16:24:34 UTC

Seems solved in 4.16.3 at least the way it is compiled in Arch.
I did not have to set amdgpu.dc=0. Works out of the box!