[nvidia] [amdgpu] Problem with external monitor

[Tomislav Pezer]

So, I installed Ubuntu 20.04 on my laptop with Ryzen 7 4800h processor and Nvidia gtx 1650 graphic card..
But i wasn't able to make my external monitor work..
At first it wasn't even recognized, but after I updated kernel to version 5.7.1 and with(only with latest) nvidia drivers 450 it recognized external monitor and I get options when I press SUPER KEY + P that I can switch screens..
But even though I pick external monitor and I see that it switch to it, monitor is turned on, but I have only black screen and can't do anything..

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
Uname: Linux 5.7.1-050701-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.capabilities.gpu0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/capabilities/gpu0'
.proc.driver.nvidia.capabilities.mig: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/capabilities/mig'
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.suspend: suspend hibernate resume
.proc.driver.nvidia.suspend_depth: default modeset uvm
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 450.66 Wed Aug 12 19:42:48 UTC 2020
 GCC version: gcc version 9.3.0 (Ubuntu 9.3.0-10ubuntu2)
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sat Oct 3 22:59:08 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.8, 5.7.1-050701-generic, x86_64: installed
 nvidia, 450.66, 5.7.1-050701-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation Device [10de:1f99] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:3a43]
 Advanced Micro Devices, Inc. [AMD/ATI] Renoir [1002:1636] (rev c6) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Renoir [17aa:3a3f]
InstallationDate: Installed on 2020-09-15 (18 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: LENOVO 82B5
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.7.1-050701-generic root=UUID=29bfdbd7-583f-4a6e-8e15-9bf5e33c383d ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/12/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: EUCN19WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: NO DPK
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Legion 5 15ARH05
dmi.modalias: dmi:bvnLENOVO:bvrEUCN19WW:bd05/12/2020:svnLENOVO:pn82B5:pvrLenovoLegion515ARH05:rvnLENOVO:rnLNVNB161216:rvrNODPK:cvnLENOVO:ct10:cvrLenovoLegion515ARH05:
dmi.product.family: Legion 5 15ARH05
dmi.product.name: 82B5
dmi.product.sku: LENOVO_MT_82B5_BU_idea_FM_Legion 5 15ARH05
dmi.product.version: Lenovo Legion 5 15ARH05
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

[Rocko (rockorequin)]

Could this be the problem described here: https://forums.developer.nvidia.com/t/ryzen-7-gtx-1660ti-blank-screen-on-external-outputs-in-hybrid-graphics-mode/157800

ie (and this is the case if the external display is connected to the NVIDIA card):

"Using amdgpu as a display offload source is currently not supported due to an incompatibility between how the amdgpu driver creates “transparent huge pages” without the compound page flag set and how the NVIDIA driver tries to map them. You can see that this is happening in the dmesg log:

[ 49.852234] Unhandled error in __nv_drm_gem_user_memory_handle_vma_fault: -22

Unfortunately, the only current workaround is to recompile the kernel without the CONFIG_TRANSPARENT_HUGEPAGE flag enabled. We’re investigating other ways to work around the problem."