Donk, the next step is to fully reverse commit bisect from kernel 4.15
to 4.16.18, in order to identify the latest kernel commit that did not
work followed immediately by the next kernel commit that did work. This
will allow a consideration of the fix commit for backporting. Could you
please do this following https://wiki.ubuntu.com/Kernel/KernelBisection
? This article was written for folks who don't know anything about
linux, so it's easy to follow.
Please note, finding adjacent kernel versions, or providing a commit
without testing it and reverting it is not fully reverse commit
bisecting.
Also, the kernel release names are irrelevant for the purposes of
bisecting.
It is most helpful that after the fix commit (not kernel version) has
been confirmed via testing, you then mark this report Status Confirmed.
Thank you for your help.
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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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)
---
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: frederic 2366 F.... pulseaudio
/dev/snd/controlC1: frederic 2366 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=/dev/mapper/Fred_SSD-Fred_Swap
IwConfig:
lo no wireless extensions.
em1 no wireless extensions.
MachineType: ASUS All Series
Package: linux (not installed)
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-29-generic
root=/dev/mapper/Fred_SSD-Fred_Root ro quiet
ProcVersionSignature: Ubuntu 4.15.0-29.31~16.04.1-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-29-generic N/A
linux-backports-modules-4.15.0-29-generic N/A
linux-firmware 1.157.20
RfKill:
Tags: xenial
Uname: Linux 4.15.0-29-generic x86_64
UpgradeStatus: Upgraded to xenial on 2016-12-17 (596 days ago)
UserGroups: adm cdrom dip lp lpadmin plugdev sambashare scanner sudo video
_MarkForUpload: True
dmi.bios.date: 10/28/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3003
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: MAXIMUS VII RANGER
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr3003:bd10/28/2015:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnMAXIMUSVIIRANGER:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: ASUS MB
dmi.product.name: All Series
dmi.product.version: System Version
dmi.sys.vendor: ASUS
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