Donk, thank you for reporting this and helping make Ubuntu better.
Could you please run the following command in a terminal as it will
automatically gather and attach debug information to this report:
apport-collect 1785481
** Package changed: linux-signed-hwe (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Importance: Undecided => Low
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: regression-update
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https://bugs.launchpad.net/bugs/1785481
Title:
amdgpu WQHD resolution(2560 × 1440) not available
Status in linux package in Ubuntu:
Incomplete
Bug description:
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)
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