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Hello,
I use ubuntu 16.04 with hwe stack and an Radeon R9 285.
With kernel 4.13 and older, I can use a resolution of 2560x1440.
But, since the upgrade to kernel 4.15, I'm limited to the 1920x1200.
I have attached the output of xrandr on both kernel.
My screen (Dell U2713HM) is plugged to the output DVI-1.
With a kernel 4.13, the output is detected as a DVI-I.
But with a kernel 4.15, the output is detected as a DVI-D.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.15.0-29-generic 4.15.0-29.31~16.04.1
ProcVersionSignature: Ubuntu 4.15.0-29.31~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Aug 5 16:46:32 2018
SourcePackage: linux-signed-hwe
UpgradeStatus: Upgraded to xenial on 2016-12-17 (595 days ago)
** Affects: linux (Ubuntu)
Importance: Low
Status: Incomplete
** Tags: amd64 apport-bug xenial
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amdgpu WQHD resolution(2560 × 1440) not available
https://bugs.launchpad.net/bugs/1785481
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