This issue persisted with the 5.0.0-25 kernel update. I later tested again after updating Mesa to 19.0.8. No change.
** Description changed: Mesa's RADV performance has dropped nearly 40% across multiple applications since upgrading my HWE kernel to 5.0.0-23. Reverting to the 4.18 kernel fixed the issue. The problem was still present when testing kernel 5.2.8 from the Ubuntu mainline PPA. My hardware: AMD Radeon RX 570 AMD Ryzen 7 1700X Asrock B450M Pro4 motherboard Tested kernels: 4.18.0-25 (good) 5.0.0-23 (bugged) + 5.0.0-25 (bugged) 5.2.8-050208 (bugged) Tested versions of Mesa, ALL suffered performance loss under the bugged kernels: 19.0.2 from the repository + 19.0.8 from the repository 19.1.2 stable from PPA 19.2-devel from PPA Comparative performance testing was done through the benchmark tool of a native Vulkan game (Total War: Three Kingdoms), and in Steam titles using DXVK and Proton with the Steam framerate monitor. Here is the output of sudo lshw -C: *-display description: VGA compatible controller product: Ellesmere [Radeon RX 470/480/570/570X/580/580X] vendor: Advanced Micro Devices, Inc. [AMD/ATI] physical id: 0 bus info: pci@0000:23:00.0 version: ef width: 64 bits clock: 33MHz capabilities: pm pciexpress msi vga_controller bus_master cap_list rom configuration: driver=amdgpu latency=0 resources: irq:46 memory:e0000000-efffffff memory:f0000000-f01fffff ioport:e000(size=256) memory:fe900000-fe93ffff memory:c0000-dffff Thanks for taking the time to look into this. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-5.0.0-23-generic 5.0.0-23.24~18.04.1 ProcVersionSignature: Ubuntu 5.0.0-23.24~18.04.1-generic 5.0.15 Uname: Linux 5.0.0-23-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.7 Architecture: amd64 CurrentDesktop: KDE Date: Sun Aug 11 04:15:28 2019 InstallationDate: Installed on 2019-02-01 (191 days ago) InstallationMedia: Kubuntu 18.04.2 LTS "Bionic Beaver" - Beta amd64 (20190129) SourcePackage: linux-signed-hwe UpgradeStatus: No upgrade log present (probably fresh install) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1839750 Title: 40% performance loss in Mesa with Linux 5.0 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe/+bug/1839750/+subscriptions -- ubuntu-bugs mailing list email@example.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs