AMDGPU Radeon RX540 system freezes poor performance with ac adapter plugged in

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Various temporary UI freezes when booting Ubuntu 18.10.
dmesg reports various amdgpu warnings and errors.

Some examples (please read dmesg attachment for complete overview):
[drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service for connector index:2! type 0 expected 3
amdgpu: [powerplay] Voltage value looks like a Leakage ID but it's not patched
[drm:dc_create [amdgpu]] *ERROR* DC: Number of connectors is zero!
t is 0
[drm:amdgpu_uvd_ring_test_ib [amdgpu]] *ERROR* amdgpu: (0)IB test timed out.
[drm:amdgpu_ib_ring_tests [amdgpu]] *ERROR* amdgpu: failed testing IB on ring 12 (-110).
[drm:amdgpu_device_ip_late_init_func_handler [amdgpu]] *ERROR* ib ring test failed (-110).
[powerplay]
[drm:uvd_v6_0_enc_ring_test_ring [amdgpu]] *ERROR* amdgpu: ring 13 test failed
[drm:amdgpu_device_ip_resume_phase2 [amdgpu]] *ERROR* resume of IP block <uvd_v6_0> failed -110
[drm:amdgpu_device_resume [amdgpu]] *ERROR* amdgpu_device_ip_resume failed (-110).
[drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, last signaled seq=1853, last emitted seq=1853
[drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring sdma0 timeout, last signaled seq=3110, last emitted seq=3110
[drm] No hardware hang detected. Did some blocks stall?
[drm] No hardware hang detected. Did some blocks stall?
[drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring sdma1 timeout, last signaled seq=2249, last emitted seq=2249
amdgpu: [powerplay]
                failed to send message 261 ret is 0
amdgpu 0000:03:00.0: GPU pci config reset

Ubuntu 18.10 (64 bit) 4.18.0-12-generic
---
ProblemType: Bug
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: whoop 2696 F.... pulseaudio
 /dev/snd/controlC0: whoop 2696 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 18.10
InstallationDate: Installed on 2018-12-01 (7 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
MachineType: Acer Aspire A515-41G
Package: linux (not installed)
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-12-generic root=UUID=a16675f6-b0e4-4e39-875e-b5edf3661e9e ro quiet splash vt.handoff=1
ProcVersionSignature: Ubuntu 4.18.0-12.13-generic 4.18.17
RelatedPackageVersions:
 linux-restricted-modules-4.18.0-12-generic N/A
 linux-backports-modules-4.18.0-12-generic N/A
 linux-firmware 1.175.1
Tags: cosmic
Uname: Linux 4.18.0-12-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 09/27/2017
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.06
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Wartortle_BS
dmi.board.vendor: BR
dmi.board.version: V1.06
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.06
dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.06:bd09/27/2017:svnAcer:pnAspireA515-41G:pvrV1.06:rvnBR:rnWartortle_BS:rvrV1.06:cvnAcer:ct10:cvrV1.06:
dmi.product.family: Aspire 5
dmi.product.name: Aspire A515-41G
dmi.product.sku: 0000000000000000
dmi.product.version: V1.06
dmi.sys.vendor: Acer

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1807511/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1807511

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

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[Kai-Heng Feng (kaihengfeng)]

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.20-rc6 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as
"Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.20-rc6

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Mainline kernel had to be installed with secure boot disabled...

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I am missing allot of powerplay failed to send message errors in dmesg when booting without power cable plugged in the laptop... Also allot less freezes...

So performance is much better when ac adapter is not connected...

[Kai-Heng Feng (kaihengfeng)]

Please file an upstream bug at https://bugs.freedesktop.org/
Product: DRI
Component: DRM/amdgpu

And attach dmesg in comment #20.

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https://bugs.freedesktop.org/show_bug.cgi?id=109073

[Michel Alessandro Brasil Risucci de França (michelrisucci)]

Same annoying problem AMD APU 9720P RX 540.

[Utku Helvacı (tuxutku)]

I have bisected this problem here: https://bugzilla.kernel.org/show_bug.cgi?id=201077
also reported it

[Utku Helvacı (tuxutku)]

The issue has been solved since 5.3.0-rc1 , closing https://bugzilla.kernel.org/show_bug.cgi?id=201077