andrew@eb8440p:~$ sudo lspci -vn
00:00.0 0600: 8086:0044 (rev 02)
        Subsystem: 103c:172a
        Flags: bus master, fast devsel, latency 0
        Capabilities: [e0] Vendor Specific Information: Len=0c <?>

00:02.0 0300: 8086:0046 (rev 02) (prog-if 00 [VGA controller])
        Subsystem: 103c:172a
        Flags: bus master, fast devsel, latency 0, IRQ 32
        Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 5050 [size=8]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Capabilities: [a4] PCI Advanced Features
        Kernel driver in use: i915
        Kernel modules: i915

00:16.0 0780: 8086:3b64 (rev 06)
        Subsystem: 103c:172a
        Flags: bus master, fast devsel, latency 0, IRQ 33
        Memory at d4724000 (64-bit, non-prefetchable) [size=16]
        Capabilities: [50] Power Management version 3
        Capabilities: [8c] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Kernel driver in use: mei_me
        Kernel modules: mei_me

00:19.0 0200: 8086:10ea (rev 05)
        Subsystem: 103c:172a
        Flags: bus master, fast devsel, latency 0, IRQ 30
        Memory at d4700000 (32-bit, non-prefetchable) [size=128K]
        Memory at d472a000 (32-bit, non-prefetchable) [size=4K]
        I/O ports at 5020 [size=32]
        Capabilities: [c8] Power Management version 2
        Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [e0] PCI Advanced Features
        Kernel driver in use: e1000e
        Kernel modules: e1000e

00:1a.0 0c03: 8086:3b3c (rev 05) (prog-if 20 [EHCI])
        Subsystem: 103c:172a
        Flags: bus master, medium devsel, latency 0, IRQ 16
        Memory at d4729000 (32-bit, non-prefetchable) [size=1K]
        Capabilities: [50] Power Management version 2
        Capabilities: [58] Debug port: BAR=1 offset=00a0
        Capabilities: [98] PCI Advanced Features
        Kernel driver in use: ehci-pci
        Kernel modules: ehci_pci

00:1b.0 0403: 8086:3b56 (rev 05)
        Subsystem: 103c:172a
        Flags: bus master, fast devsel, latency 0, IRQ 34
        Memory at d4720000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 2
        Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
        Capabilities: [100] Virtual Channel
        Capabilities: [130] Root Complex Link
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel

00:1c.0 0604: 8086:3b42 (rev 05) (prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 27
        Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
        Memory behind bridge: d4600000-d46fffff
        Capabilities: [40] Express Root Port (Slot+), MSI 00
        Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [90] Subsystem: 103c:172a
        Capabilities: [a0] Power Management version 2
        Kernel driver in use: pcieport

00:1c.1 0604: 8086:3b44 (rev 05) (prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 28
        Bus: primary=00, secondary=02, subordinate=42, sec-latency=0
        I/O behind bridge: 00003000-00004fff
        Memory behind bridge: d0600000-d45fffff
        Prefetchable memory behind bridge: 00000000d4900000-00000000d4afffff
        Capabilities: [40] Express Root Port (Slot+), MSI 00
        Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [90] Subsystem: 103c:172a
        Capabilities: [a0] Power Management version 2
        Kernel driver in use: pcieport

00:1c.3 0604: 8086:3b48 (rev 05) (prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0, IRQ 29
        Bus: primary=00, secondary=43, subordinate=43, sec-latency=0
        Memory behind bridge: d0500000-d05fffff
        Capabilities: [40] Express Root Port (Slot+), MSI 00
        Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [90] Subsystem: 103c:172a
        Capabilities: [a0] Power Management version 2
        Kernel driver in use: pcieport

00:1d.0 0c03: 8086:3b34 (rev 05) (prog-if 20 [EHCI])
        Subsystem: 103c:172a
        Flags: bus master, medium devsel, latency 0, IRQ 20
        Memory at d4728000 (32-bit, non-prefetchable) [size=1K]
        Capabilities: [50] Power Management version 2
        Capabilities: [58] Debug port: BAR=1 offset=00a0
        Capabilities: [98] PCI Advanced Features
        Kernel driver in use: ehci-pci
        Kernel modules: ehci_pci

00:1e.0 0604: 8086:2448 (rev a5) (prog-if 01 [Subtractive decode])
        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=44, subordinate=45, sec-latency=64
        I/O behind bridge: 00002000-00002fff
        Memory behind bridge: d0400000-d04fffff
        Capabilities: [50] Subsystem: 103c:172a

00:1f.0 0601: 8086:3b07 (rev 05)
        Subsystem: 103c:172a
        Flags: bus master, medium devsel, latency 0
        Capabilities: [e0] Vendor Specific Information: Len=10 <?>
        Kernel driver in use: lpc_ich
        Kernel modules: lpc_ich

00:1f.2 0106: 8086:3b2f (rev 05) (prog-if 01 [AHCI 1.0])
        Subsystem: 103c:172a
        Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 31
        I/O ports at 5048 [size=8]
        I/O ports at 505c [size=4]
        I/O ports at 5040 [size=8]
        I/O ports at 5058 [size=4]
        I/O ports at 5000 [size=32]
        Memory at d4727000 (32-bit, non-prefetchable) [size=2K]
        Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [70] Power Management version 3
        Capabilities: [a8] SATA HBA v1.0
        Capabilities: [b0] PCI Advanced Features
        Kernel driver in use: ahci
        Kernel modules: ahci

00:1f.6 1180: 8086:3b32 (rev 05)
        Subsystem: 103c:172a
        Flags: bus master, fast devsel, latency 0, IRQ 18
        Memory at d4726000 (64-bit, non-prefetchable) [size=4K]
        Capabilities: [50] Power Management version 3
        Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
        Kernel driver in use: intel ips
        Kernel modules: intel_ips

43:00.0 0280: 8086:4239 (rev 35)
        Subsystem: 8086:1311
        Flags: fast devsel, IRQ 19
        Memory at d0500000 (64-bit, non-prefetchable) [size=8K]
        Capabilities: [c8] Power Management version 3
        Capabilities: [d0] MSI: Enable- Count=1/1 Maskable- 64bit+
        Capabilities: [e0] Express Endpoint, MSI 00
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [140] Device Serial Number 58-94-6b-ff-ff-b1-55-ac
        Kernel modules: iwlwifi

44:06.0 0c00: 1180:0832 (rev 06) (prog-if 10 [OHCI])
        Subsystem: 103c:172a
        Flags: bus master, medium devsel, latency 64, IRQ 20
        Memory at d0401000 (32-bit, non-prefetchable) [size=2K]
        Capabilities: [dc] Power Management version 2
        Kernel driver in use: firewire_ohci
        Kernel modules: firewire_ohci

44:06.1 0805: 1180:0822 (rev 25)
        Subsystem: 103c:172a
        Flags: bus master, medium devsel, latency 64, IRQ 22
        Memory at d0403000 (32-bit, non-prefetchable) [size=256]
        Capabilities: [80] Power Management version 2
        Kernel driver in use: sdhci-pci
        Kernel modules: sdhci_pci

44:06.2 0607: 1180:0476 (rev bb)
        Subsystem: 103c:172a
        Flags: bus master, medium devsel, latency 168, IRQ 22
        Memory at d0400000 (32-bit, non-prefetchable) [size=4K]
        Bus: primary=44, secondary=45, subordinate=45, sec-latency=176
        Memory window 0: d8000000-dbffffff (prefetchable)
        Memory window 1: dc000000-dfffffff
        I/O window 0: 00002000-000020ff
        I/O window 1: 00002400-000024ff
        16-bit legacy interface ports at 0001
        Capabilities: [dc] Power Management version 2
        Kernel driver in use: yenta_cardbus
        Kernel modules: yenta_socket

ff:00.0 0600: 8086:2c62 (rev 02)
        Subsystem: 8086:8086
        Flags: bus master, fast devsel, latency 0

ff:00.1 0600: 8086:2d01 (rev 02)
        Subsystem: 8086:8086
        Flags: bus master, fast devsel, latency 0

ff:02.0 0600: 8086:2d10 (rev 02)
        Subsystem: 8086:8086
        Flags: bus master, fast devsel, latency 0

ff:02.1 0600: 8086:2d11 (rev 02)
        Subsystem: 8086:8086
        Flags: bus master, fast devsel, latency 0

ff:02.2 0600: 8086:2d12 (rev 02)
        Subsystem: 8086:8086
        Flags: bus master, fast devsel, latency 0

ff:02.3 0600: 8086:2d13 (rev 02)
        Subsystem: 8086:8086
        Flags: bus master, fast devsel, latency 0

andrew@eb8440p:~$ uname -v
#1 SMP Debian 5.10.19-1~bpo10+1 (2021-03-13)
andrew@eb8440p:~$

As mentioned in the original report, the issue has existed for quite some time, and has now sort of to be downgraded from defunct to unreliable, I am reporting against the testing-kernel, because the problem shows in the backported kernel-version, from buster-backports, which is presumably identical with the current testing-kernel.

recent dmesg-output from the notebook is there:
 bug #953305

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