Built kernel image based on 6.12-rc3 with the following change:

 Heiner Kallweit 2024-10-16 18:54:07 UTC

Thanks. Please note that 6.8 isn't an LTS kernel and therefore won't
receive fixes. Best re-test with latest mainline kernel 6.11.

If the issue persists, please re-test with the following applied:

diff --git a/drivers/net/ethernet/realtek/r8169_main.c 
b/drivers/net/ethernet/realtek/r8169_main.c
index 1a4d834c2..322a1e930 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4805,7 +4805,11 @@ static irqreturn_t rtl8169_interrupt(int irq, void 
*dev_instance)
        struct rtl8169_private *tp = dev_instance;
        u32 status = rtl_get_events(tp);
 
-       if ((status & 0xffff) == 0xffff || !(status & tp->irq_mask))
+       if ((status & 0xffff) == 0xffff)
+               return IRQ_NONE;
+
+       status &= tp->irq_mask | RxFIFOOver;
+       if (!status)
                return IRQ_NONE;
 
        if (unlikely(status & SYSErr)) {
--

** Attachment added: 
"linux-image-6.12.0-rc3+_6.12.0-rc3-00047-ga4fcb95caf1f-21_amd64.deb"
   
https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-6.8/+bug/2080454/+attachment/5828823/+files/linux-image-6.12.0-rc3+_6.12.0-rc3-00047-ga4fcb95caf1f-21_amd64.deb

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https://bugs.launchpad.net/bugs/2080454

Title:
  NIC(r8169) didn't link up after resuming from suspend

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