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System:

  • Ryzen 5, no integrated graphics
  • B450 Tomahawk Max motherboard
  • ADATA SX8100 512 GB SSD
  • Nvidia GeForce 1660 main GPU
  • Radeon HD 5450 secondary GPU
  • Dual boot Ubuntu 20.04 and windows 10
  • UEFI firmware
  • No overclocking or other tweaks
  • no xorg.conf, using auto-config

The monitor connected to the radeon device works just fine.

The monitor connected to the nvidia is a blank screen. The power indicator shows that it is "on" (i.e. not in power saving mode), but the screen is blank. I can move the mouse cursor and windows onto that screen, but nothing is displayed.

I downgraded the nvidia driver to 450 because I seemed to get boot issues (kernel panic, no init found) if I used 455 (although I can't be sure yet that it won't happen with 450).

The nouveua driver for this card displays a few purple and green horizontal lines, and the rest of the screen is blank.

Before we blame the hardware, note that this setup works flawlessly in windows, including gaming.

incidentally, I noted that I have prime-select installed. I thought that was only used for selecting the GPU used on shared-output ports between integrated graphics and a discrete video card, primarily for laptops. My machine is a desktop with no integrated graphics. Is there any reason to have prime-select installed at all? I have tried switching between the "intel" and "nvidia" profiles with no effect. Should I remove it, in case it is screwing with config?

xrandr:

Screen 0: minimum 320 x 200, current 3599 x 1080, maximum 8192 x 8192
HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm
   1920x1080     60.00*   59.94    30.00    24.00    29.97    23.98  
   1920x1080i    60.00    59.94  
   2880x480      60.00    59.94  
   1280x1024     60.02  
   1360x768      60.02  
   1152x864      59.97  
   1280x720      60.00    59.94  
   1024x768      60.00  
   1440x480      60.00    59.94  
   800x600       60.32  
   720x480       60.00    59.94  
   640x480       60.00    59.94  
   720x400       70.08  
DVI-0 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)
DP-1-0 disconnected
DP-1-1 disconnected
DP-1-2 disconnected
DP-1-3 disconnected
HDMI-1-0 connected 1680x1050+1919+0 474mm x 296mm panning 1680x1080+1919+0 tracking 3599x1080+0+0 border 0/0/0/0
   1680x1050     59.97*+  59.95  
   1600x1000     60.00  
   1440x900      74.98    59.89  
   1280x1024     75.02    72.00    60.02  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   800x600       75.00    72.19    60.32  
   640x480       75.00    72.81    59.94  
DP-1-4 disconnected
DP-1-5 disconnected
  1280x1024 (0x61) 108.000MHz +HSync +VSync
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock  63.98KHz
        v: height 1024 start 1025 end 1028 total 1066           clock  60.02Hz
  1024x768 (0x66) 65.000MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock  48.36KHz
        v: height  768 start  771 end  777 total  806           clock  60.00Hz
  800x600 (0x69) 40.000MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock  37.88KHz
        v: height  600 start  601 end  605 total  628           clock  60.32Hz
  640x480 (0x6d) 25.175MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock  31.47KHz
        v: height  480 start  490 end  492 total  525           clock  59.94Hz

lspci -vnn:

25:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Cedar [Radeon HD 5000/6000/7350/8350 Series] [1002:68f9] (prog-if 00 [VGA controller])
        Subsystem: VISIONTEK Cedar [Radeon HD 5000/6000/7350/8350 Series] [1545:5450]
        Flags: bus master, fast devsel, latency 0, IRQ 56
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Memory at fc520000 (64-bit, non-prefetchable) [size=128K]
        I/O ports at d000 [size=256]
        Expansion ROM at fc500000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: radeon
        Kernel modules: radeon

25:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Cedar HDMI Audio [Radeon HD 5400/6300/7300 Series] [1002:aa68]
        Subsystem: VISIONTEK Cedar HDMI Audio [Radeon HD 5400/6300/7300 Series] [1545:aa68]
        Flags: bus master, fast devsel, latency 0, IRQ 68
        Memory at fc540000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel

26:00.0 VGA compatible controller [0300]: NVIDIA Corporation TU116 [GeForce GTX 1660] [10de:2184] (rev a1) (prog-if 00 [VGA controller])
        Subsystem: Micro-Star International Co., Ltd. [MSI] TU116 [GeForce GTX 1660] [1462:3792]
        Flags: bus master, fast devsel, latency 0, IRQ 72
        Memory at fb000000 (32-bit, non-prefetchable) [size=16M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Memory at d0000000 (64-bit, prefetchable) [size=32M]
        I/O ports at f000 [size=128]
        Expansion ROM at fc000000 [virtual] [disabled] [size=512K]
        Capabilities: <access denied>
        Kernel driver in use: nvidia
        Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia

26:00.1 Audio device [0403]: NVIDIA Corporation TU116 High Definition Audio Controller [10de:1aeb] (rev a1)
        Subsystem: Micro-Star International Co., Ltd. [MSI] TU116 High Definition Audio Controller [1462:3792]
        Flags: bus master, fast devsel, latency 0, IRQ 69
        Memory at fc080000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel

26:00.2 USB controller [0c03]: NVIDIA Corporation TU116 USB 3.1 Host Controller [10de:1aec] (rev a1) (prog-if 30 [XHCI])
        Subsystem: Micro-Star International Co., Ltd. [MSI] Device [1462:3792]
        Flags: fast devsel, IRQ 40
        Memory at d2000000 (64-bit, prefetchable) [size=256K]
        Memory at d2040000 (64-bit, prefetchable) [size=64K]
        Capabilities: <access denied>
        Kernel driver in use: xhci_hcd

26:00.3 Serial bus controller [0c80]: NVIDIA Corporation TU116 [GeForce GTX 1650 SUPER] [10de:1aed] (rev a1)
        Subsystem: Micro-Star International Co., Ltd. [MSI] TU116 [GeForce GTX 1650 SUPER] [1462:3792]
        Flags: bus master, fast devsel, latency 0, IRQ 52
        Memory at fc084000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: <access denied>
        Kernel driver in use: nvidia-gpu
        Kernel modules: i2c_nvidia_gpu

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