Public bug reported:

When I boot into Linux 5.8.0-44, I get a 1024x768 resolution instead of
full monitor resolution. About page in settings shows that `llvmpipe
(LLVM 11.0.0, 256 bits)` is used instead of amdgpu.

This is a regression in Linux 5.8.0-44, the previous versions (5.8.0-43
and 5.8.0-41) work fine. I've also tested the proposed version
(5.8.0-45) and it also had this issue.

GPU: Radeon RX 570 4GB

07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev ef)
07:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere HDMI 
Audio [Radeon RX 470/480 / 570/580/590]

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: linux-image-5.8.0-44-generic 5.8.0-44.50
ProcVersionSignature: Ubuntu 5.8.0-44.50-generic 5.8.18
Uname: Linux 5.8.0-44-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  user       2147 F.... pulseaudio
 /dev/snd/controlC0:  user       2147 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Feb 24 22:25:52 2021
HibernationDevice: RESUME=/dev/mapper/ubuntu--vg-swap_1
InstallationDate: Installed on 2019-08-31 (543 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
MachineType: Gigabyte Technology Co., Ltd. AB350-Gaming 3
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.8.0-44-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash 
resume=/dev/mapper/ubuntu--vg-swap_1 vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.8.0-44-generic N/A
 linux-backports-modules-5.8.0-44-generic  N/A
 linux-firmware                            1.190.3
SourcePackage: linux
UpgradeStatus: Upgraded to groovy on 2020-10-20 (127 days ago)
dmi.bios.date: 11/27/2019
dmi.bios.release: 5.14
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F50a
dmi.board.asset.tag: Default string
dmi.board.name: AB350-Gaming 3-CF
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF50a:bd11/27/2019:br5.14:svnGigabyteTechnologyCo.,Ltd.:pnAB350-Gaming3:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnAB350-Gaming3-CF:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: Default string
dmi.product.name: AB350-Gaming 3
dmi.product.sku: Default string
dmi.product.version: Default string
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
modified.conffile..etc.default.apport: [modified]
mtime.conffile..etc.default.apport: 2021-01-03T13:15:50.415962

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug groovy

** Description changed:

- When booting into Linux 5.8.0-44, I get a 1024x768 resolution instead of
+ When I boot into Linux 5.8.0-44, I get a 1024x768 resolution instead of
  full monitor resolution. About page in settings shows that `llvmpipe
  (LLVM 11.0.0, 256 bits)` is used instead of amdgpu.
  
  This is a regression in Linux 5.8.0-44, the previous versions (5.8.0-43
  and 5.8.0-41) work fine. I've also tested the proposed version
  (5.8.0-45) and it also had this issue.
  
  Ubuntu 20.10
  GPU: Radeon RX 570 4GB
  
  07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev ef)
  07:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere HDMI 
Audio [Radeon RX 470/480 / 570/580/590]
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: linux-image-5.8.0-44-generic 5.8.0-44.50
  ProcVersionSignature: Ubuntu 5.8.0-44.50-generic 5.8.18
  Uname: Linux 5.8.0-44-generic x86_64
  ApportVersion: 2.20.11-0ubuntu50.5
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  user       2147 F.... pulseaudio
-  /dev/snd/controlC0:  user       2147 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  user       2147 F.... pulseaudio
+  /dev/snd/controlC0:  user       2147 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Feb 24 22:25:52 2021
  HibernationDevice: RESUME=/dev/mapper/ubuntu--vg-swap_1
  InstallationDate: Installed on 2019-08-31 (543 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 
(20190805)
  MachineType: Gigabyte Technology Co., Ltd. AB350-Gaming 3
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.8.0-44-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash 
resume=/dev/mapper/ubuntu--vg-swap_1 vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-5.8.0-44-generic N/A
-  linux-backports-modules-5.8.0-44-generic  N/A
-  linux-firmware                            1.190.3
+  linux-restricted-modules-5.8.0-44-generic N/A
+  linux-backports-modules-5.8.0-44-generic  N/A
+  linux-firmware                            1.190.3
  SourcePackage: linux
  UpgradeStatus: Upgraded to groovy on 2020-10-20 (127 days ago)
  dmi.bios.date: 11/27/2019
  dmi.bios.release: 5.14
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F50a
  dmi.board.asset.tag: Default string
  dmi.board.name: AB350-Gaming 3-CF
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF50a:bd11/27/2019:br5.14:svnGigabyteTechnologyCo.,Ltd.:pnAB350-Gaming3:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnAB350-Gaming3-CF:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: Default string
  dmi.product.name: AB350-Gaming 3
  dmi.product.sku: Default string
  dmi.product.version: Default string
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  modified.conffile..etc.default.apport: [modified]
  mtime.conffile..etc.default.apport: 2021-01-03T13:15:50.415962

** Description changed:

  When I boot into Linux 5.8.0-44, I get a 1024x768 resolution instead of
  full monitor resolution. About page in settings shows that `llvmpipe
  (LLVM 11.0.0, 256 bits)` is used instead of amdgpu.
  
  This is a regression in Linux 5.8.0-44, the previous versions (5.8.0-43
  and 5.8.0-41) work fine. I've also tested the proposed version
  (5.8.0-45) and it also had this issue.
  
- Ubuntu 20.10
  GPU: Radeon RX 570 4GB
  
  07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev ef)
  07:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere HDMI 
Audio [Radeon RX 470/480 / 570/580/590]
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: linux-image-5.8.0-44-generic 5.8.0-44.50
  ProcVersionSignature: Ubuntu 5.8.0-44.50-generic 5.8.18
  Uname: Linux 5.8.0-44-generic x86_64
  ApportVersion: 2.20.11-0ubuntu50.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  user       2147 F.... pulseaudio
   /dev/snd/controlC0:  user       2147 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Feb 24 22:25:52 2021
  HibernationDevice: RESUME=/dev/mapper/ubuntu--vg-swap_1
  InstallationDate: Installed on 2019-08-31 (543 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 
(20190805)
  MachineType: Gigabyte Technology Co., Ltd. AB350-Gaming 3
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.8.0-44-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash 
resume=/dev/mapper/ubuntu--vg-swap_1 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-5.8.0-44-generic N/A
   linux-backports-modules-5.8.0-44-generic  N/A
   linux-firmware                            1.190.3
  SourcePackage: linux
  UpgradeStatus: Upgraded to groovy on 2020-10-20 (127 days ago)
  dmi.bios.date: 11/27/2019
  dmi.bios.release: 5.14
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F50a
  dmi.board.asset.tag: Default string
  dmi.board.name: AB350-Gaming 3-CF
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF50a:bd11/27/2019:br5.14:svnGigabyteTechnologyCo.,Ltd.:pnAB350-Gaming3:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnAB350-Gaming3-CF:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: Default string
  dmi.product.name: AB350-Gaming 3
  dmi.product.sku: Default string
  dmi.product.version: Default string
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  modified.conffile..etc.default.apport: [modified]
  mtime.conffile..etc.default.apport: 2021-01-03T13:15:50.415962

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https://bugs.launchpad.net/bugs/1916798

Title:
  llvmpipe used instead of amdgpu

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