Sorry for the late reply. Can you do the following for me?
1) Remove all files in /lib/firmware/amdgpu/.
2) Copy files dimgrey_cavefish_* from 
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/amdgpu
 to /lib/firmware/amdgpu.
3) Reboot and check the GPU performance.
4) Attach the output of dmesg to this bug.

It's unclear to me if amdgpu driver needs anything besides the
dimgrey_cavefish firmware blobs but hopefully the dmesg output will tell
us.

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-firmware in Ubuntu.
https://bugs.launchpad.net/bugs/1984004

Title:
  Linux Firmware drops AMD RX6650 XT Performance

Status in linux-firmware package in Ubuntu:
  Invalid
Status in linux-firmware source package in Jammy:
  Triaged

Bug description:
  Kernel: 5.15.0-43-generic
  linux-firmware: 20220329.git681281e4-0ubuntu3.3
  Tested with: Mint 21 Cinnamon (Ubuntu 22.04 based)

  In e.g. the Unigine benchmark, the linux-firmware packages drops the
  performance of my AMD RX 6650 XT GPU from 98 FPS in 1080p-high down to
  23 FPS. That wasn't a problem in Mint 20.3 with kernel 5.15 (Ubuntu
  20.04 based).

  Getting the firmware directly from git brings the performance back to about 
100 FPS:
  git clone 
git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
  cd linux-firmware
  sudo make install
  sudo update-initramfs -c -k all

  Re-installing the linux-firmware package causes the performance to
  drop again. So there is a problem with the linux firmware at least for
  the RX 6650 XT, maybe for the whole RX 6000 series.

  The linux-firmware package in Ubuntu 22.04 should be updated.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu82.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  daelach    1352 F.... pulseaudio
   /dev/snd/controlC0:  daelach    1352 F.... pulseaudio
   /dev/snd/controlC1:  daelach    1352 F.... pulseaudio
  CasperMD5CheckResult: unknown
  CurrentDesktop: X-Cinnamon
  Dependencies: firmware-sof-signed 2.0-1ubuntu3 [origin: Ubuntu]
  DistroRelease: Linux Mint 21
  InstallationDate: Installed on 2020-08-24 (714 days ago)
  InstallationMedia: Linux Mint 20 "Ulyana" - Release amd64 20200624
  IwConfig:
   lo        no wireless extensions.
   
   enp6s0    no wireless extensions.
  MachineType: System manufacturer System Product Name
  PackageArchitecture: all
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-43-generic 
root=UUID=a4b18dd9-4989-4bf5-8107-e55b8f8f6df4 ro amd_iommu=on iommu=pt quiet 
loglevel=3 splash
  ProcVersionSignature: Ubuntu 5.15.0-43.46-generic 5.15.39
  RelatedPackageVersions:
   linux-restricted-modules-5.15.0-43-generic N/A
   linux-backports-modules-5.15.0-43-generic  N/A
   linux-firmware                             20220329.git681281e4-0ubuntu3.3
  RfKill:
   
  Tags: vanessa third-party-packages
  Uname: Linux 5.15.0-43-generic x86_64
  UnreportableReason: This does not seem to be an official Linux package. 
Please retry after updating the indexes of available packages. If that does not 
work, then remove related third party packages and try again.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 07/25/2022
  dmi.bios.release: 5.17
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4901
  dmi.board.asset.tag: Default string
  dmi.board.name: ROG STRIX B450-F GAMING
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr4901:bd07/25/2022:br5.17:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGSTRIXB450-FGAMING:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.sku: SKU
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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