linux-generic-hwe-20.04: RTL8125 rev. B ethernet controller is not recognized

[rppt]

RTL8125 rev. B controller is not recognized

$ lspci | grep -i realtek
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 04)

$ lspci -v -s 02:00.0
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 04)
 Subsystem: Micro-Star International Co., Ltd. [MSI] RTL8125 2.5GbE Controller
 Flags: fast devsel, IRQ 16
 I/O ports at 3000 [size=256]
 Memory at ab200000 (64-bit, non-prefetchable) [size=64K]
 Memory at ab210000 (64-bit, non-prefetchable) [size=16K]
 Capabilities: [40] Power Management version 3
 Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
 Capabilities: [70] Express Endpoint, MSI 01
 Capabilities: [b0] MSI-X: Enable- Count=32 Masked-
 Capabilities: [d0] Vital Product Data
 Capabilities: [100] Advanced Error Reporting
 Capabilities: [148] Virtual Channel
 Capabilities: [168] Device Serial Number 01-00-00-00-68-4c-e0-00
 Capabilities: [178] Transaction Processing Hints
 Capabilities: [204] Latency Tolerance Reporting
 Capabilities: [20c] L1 PM Substates
 Capabilities: [21c] Vendor Specific Information: ID=0002 Rev=4 Len=100 <?>
 Kernel modules: r8169
$ dmesg | grep 8169
[ 0.690383] r8169 0000:02:00.0: can't disable ASPM; OS doesn't have ASPM control
[ 0.690393] r8169 0000:02:00.0: enabling device (0000 -> 0003)
[ 0.690516] r8169 0000:02:00.0: unknown chip XID 641

The support for this revision was added by upstream commit 0439297be95111cf9ef5ece2091af16d140ce2ef:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/net/ethernet/realtek/r8169_main.c?id=0439297be95111cf9ef5ece2091af16d140ce2ef