Yes, I understand about lspci. I connect a dGPU, the iGPU is not visible since it is not PCIe-related.
The problem is that the external devices are not well connected using such risers for Nano (they work in other cases, probably it is the issue of susceptibility to such levels of electrical signals). It tries 4 times and skips the device (the log in the first message).
I tried several and the only card I can connect to Nano is an old 128 (or 256) mb ATI x600:)
But seems the memory BAR requested by the card is too huge.
[ 1.520578] pci 0000:01:00.1: [1002:3e70] type 00 class 0x038000
[ 1.520604] pci 0000:01:00.1: reg 0x10: [mem 0x00000000-0x0000ffff]
[ 1.520746] pci 0000:01:00.1: supports D1 D2
[ 1.520950] pci 0000:01:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with ‘pcie_aspm=force’
[ 1.520991] pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 01
[ 1.521160] pci 0000:02:00.0: [10ec:8168] type 00 class 0x020000
[ 1.521188] pci 0000:02:00.0: reg 0x10: [io 0x0000-0x00ff]
[ 1.521222] pci 0000:02:00.0: reg 0x18: [mem 0x00000000-0x00000fff 64bit]
[ 1.521245] pci 0000:02:00.0: reg 0x20: [mem 0x00000000-0x00003fff 64bit]
[ 1.521403] pci 0000:02:00.0: supports D1 D2
[ 1.521409] pci 0000:02:00.0: PME# supported from D0 D1 D2 D3hot D3cold
[ 1.530350] pci_bus 0000:02: busn_res: [bus 02-ff] end is updated to 02
[ 1.530426] pci 0000:00:01.0: BAR 14: no space for [mem size 0x18000000]
[ 1.530433] pci 0000:00:01.0: BAR 14: failed to assign [mem size 0x18000000]
[ 1.530439] pci 0000:00:02.0: BAR 14: assigned [mem 0x13000000-0x130fffff]
[ 1.530443] pci 0000:00:01.0: BAR 13: assigned [io 0x1000-0x1fff]
[ 1.530448] pci 0000:00:02.0: BAR 13: assigned [io 0x2000-0x2fff]
[ 1.530457] pci 0000:01:00.0: BAR 0: no space for [mem size 0x10000000 pref]
[ 1.530462] pci 0000:01:00.0: BAR 0: failed to assign [mem size 0x10000000 pref]
[ 1.530467] pci 0000:01:00.0: BAR 6: no space for [mem size 0x00020000 pref]
[ 1.530471] pci 0000:01:00.0: BAR 6: failed to assign [mem size 0x00020000 pref]
[ 1.530475] pci 0000:01:00.0: BAR 2: no space for [mem size 0x00010000]
[ 1.530478] pci 0000:01:00.0: BAR 2: failed to assign [mem size 0x00010000]
[ 1.530483] pci 0000:01:00.1: BAR 0: no space for [mem size 0x00010000]
[ 1.530486] pci 0000:01:00.1: BAR 0: failed to assign [mem size 0x00010000]
[ 1.530490] pci 0000:01:00.0: BAR 1: assigned [io 0x1000-0x10ff]
[ 1.530501] pci 0000:00:01.0: PCI bridge to [bus 01]
[ 1.530508] pci 0000:00:01.0: bridge window [io 0x1000-0x1fff]
[ 1.530522] pci 0000:02:00.0: BAR 4: assigned [mem 0x13000000-0x13003fff 64bit]
[ 1.530542] pci 0000:02:00.0: BAR 2: assigned [mem 0x13004000-0x13004fff 64bit]
[ 1.530560] pci 0000:02:00.0: BAR 0: assigned [io 0x2000-0x20ff]
[ 1.530568] pci 0000:00:02.0: PCI bridge to [bus 02]
[ 1.530572] pci 0000:00:02.0: bridge window [io 0x2000-0x2fff]
[ 1.530578] pci 0000:00:02.0: bridge window [mem 0x13000000-0x130fffff]
[ 1.531032] pcieport 0000:00:01.0: Signaling PME through PCIe PME interrupt
[ 1.531036] pci 0000:01:00.0: Signaling PME through PCIe PME interrupt
[ 1.531039] pci 0000:01:00.1: Signaling PME through PCIe PME interrupt
[ 1.531046] pcie_pme 0000:00:01.0:pcie001: service driver pcie_pme loaded
[ 1.531163] aer 0000:00:01.0:pcie002: service driver aer loaded
[ 1.531379] pcieport 0000:00:02.0: Signaling PME through PCIe PME interrupt
[ 1.531383] pci 0000:02:00.0: Signaling PME through PCIe PME interrupt
[ 1.531389] pcie_pme 0000:00:02.0:pcie001: service driver pcie_pme loaded
[ 1.531486] aer 0000:00:02.0:pcie002: service driver aer loaded
[ 4.569972] ehci-pci: EHCI PCI platform driver
[ 4.580674] ohci-pci: OHCI PCI platform driver
$ lspci
00:01.0 PCI bridge: NVIDIA Corporation Device 0fae (rev a1)
00:02.0 PCI bridge: NVIDIA Corporation Device 0faf (rev a1)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV380 [Radeon X600]
01:00.1 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] RV380 [Radeon X600] (Secondary)
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)