After blacklisting the amdgpu module via echo "blacklist amdgpu" > /etc/modprobe.d/blacklist-amdgpu.conf && update-initramfs -u; the system will let me boot all the way up with more than one RX580 installed (currently two are installed). Running modprobe amdgpu after the system was already booted cause a kernel panic, which I have captured and attached a screenshot of below.
root@r920-cmwhv52:~# lspci | grep AMD 22:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev e7) 22:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590] 61:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev e7) 61:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590] root@r920-cmwhv52:~# lspci -vs 22:00 22:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev e7) (prog-if 00 [VGA controller]) Subsystem: Micro-Star International Co., Ltd. [MSI] Radeon RX 580 Flags: fast devsel, IRQ 15, NUMA node 1 Memory at 3c000000000 (64-bit, prefetchable) [disabled] [size=256M] Memory at 3c010000000 (64-bit, prefetchable) [disabled] [size=2M] I/O ports at 4000 [disabled] [size=256] Memory at afe80000 (32-bit, non-prefetchable) [disabled] [size=256K] Expansion ROM at afec0000 [disabled] [size=128K] Capabilities: [48] Vendor Specific Information: Len=08 <?> Capabilities: [50] Power Management version 3 Capabilities: [58] Express Legacy Endpoint, MSI 00 Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> Capabilities: [150] Advanced Error Reporting Capabilities: [200] Resizable BAR <?> Capabilities: [270] Secondary PCI Express Capabilities: [2b0] Address Translation Service (ATS) Capabilities: [2c0] Page Request Interface (PRI) Capabilities: [2d0] Process Address Space ID (PASID) Capabilities: [320] Latency Tolerance Reporting Capabilities: [328] Alternative Routing-ID Interpretation (ARI) Capabilities: [370] L1 PM Substates lspci: Unable to load libkmod resources: error -12 22:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590] Subsystem: Micro-Star International Co., Ltd. [MSI] Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590] Flags: bus master, fast devsel, latency 0, IRQ 379, NUMA node 1 Memory at afefc000 (64-bit, non-prefetchable) [size=16K] Capabilities: [48] Vendor Specific Information: Len=08 <?> Capabilities: [50] Power Management version 3 Capabilities: [58] Express Legacy Endpoint, MSI 00 Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> Capabilities: [150] Advanced Error Reporting Capabilities: [328] Alternative Routing-ID Interpretation (ARI) Kernel driver in use: snd_hda_intel root@r920-cmwhv52:~# lspci -vs 61:00 61:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev e7) (prog-if 00 [VGA controller]) Subsystem: Micro-Star International Co., Ltd. [MSI] Radeon RX 580 Flags: fast devsel, IRQ 15, NUMA node 3 Memory at 33ff0000000 (64-bit, prefetchable) [disabled] [size=256M] Memory at 33fefe00000 (64-bit, prefetchable) [disabled] [size=2M] I/O ports at 6000 [disabled] [size=256] Memory at a7e80000 (32-bit, non-prefetchable) [disabled] [size=256K] Expansion ROM at a7ec0000 [disabled] [size=128K] Capabilities: [48] Vendor Specific Information: Len=08 <?> Capabilities: [50] Power Management version 3 Capabilities: [58] Express Legacy Endpoint, MSI 00 Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> Capabilities: [150] Advanced Error Reporting Capabilities: [200] Resizable BAR <?> Capabilities: [270] Secondary PCI Express Capabilities: [2b0] Address Translation Service (ATS) Capabilities: [2c0] Page Request Interface (PRI) Capabilities: [2d0] Process Address Space ID (PASID) Capabilities: [320] Latency Tolerance Reporting Capabilities: [328] Alternative Routing-ID Interpretation (ARI) Capabilities: [370] L1 PM Substates lspci: Unable to load libkmod resources: error -12 61:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590] Subsystem: Micro-Star International Co., Ltd. [MSI] Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590] Flags: bus master, fast devsel, latency 0, IRQ 381, NUMA node 3 Memory at a7efc000 (64-bit, non-prefetchable) [size=16K] Capabilities: [48] Vendor Specific Information: Len=08 <?> Capabilities: [50] Power Management version 3 Capabilities: [58] Express Legacy Endpoint, MSI 00 Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> Capabilities: [150] Advanced Error Reporting Capabilities: [328] Alternative Routing-ID Interpretation (ARI) Kernel driver in use: snd_hda_intel ** Attachment added: "rpviewer-31.png" https://bugs.launchpad.net/ubuntu/+source/linux-5.4/+bug/1867455/+attachment/5336952/+files/rpviewer-31.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1867455 Title: Having more than one AMD Radeon RX 580 installed will trigger a PCIe bus fatal error during boot. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-5.4/+bug/1867455/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs