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Bug#1111016: marked as done (Severely reduced network speed on Debian 13 compared to Debian 12)

Your message dated Sat, 01 Nov 2025 20:49:11 +0100 (CET)
with message-id <[🔎] 20251101194911.6A98EBE2EE7@eldamar.lan>
and subject line Closing this bug (BTS maintenance for src:linux bugs)
has caused the Debian Bug report #1111362,
regarding Severely reduced network speed on Debian 13 compared to Debian 12
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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immediately.)


-- 
1111362: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1111362
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message ---
Package: linux-image-6.12
Version: 6.12.x (Debian 13)
Severity: important

Subject: Severely reduced network speed on Debian 13 compared to Debian 12

On Debian 13 (kernel 6.12), Ethernet speed is limited to around 25 Mbps on a Realtek RTL8168e NIC.  
On the same machine running Debian 12, the speed consistently reaches 100 Mbps or more.  
The firmware `rtl8168e-3.fw` is present and correctly loaded.  
The driver in use is `r8169`.  
The issue also occurs in live sessions.

Steps to reproduce:
1. Boot Debian 13 on a machine with RTL8168e
2. Check negotiated speed with `ethtool eth0`
3. Run a speed test

Expected result:
Network speed matching the NIC's capabilities (up to 1000 Mbps)

Actual result:
Speed limited to around 25 Mbps

Additional information:
- Firmware package `firmware-realtek` is installed
- Kernel version: 6.12.x
- NIC: Realtek RTL8168e
- Debian 12 on the same hardware performs correctly
- The issue is reproducible even with custom live ISOs

Thank you for your attention,  
Andrea

--- End Message ---
--- Begin Message --- 
Hi

This bug was filed for a (very) old kernel or the bug is old itself
without resolution. Maybe it was for a feature enablement which nobody
acted on. We are sorry we were not able to timely deal with this issue.
There are many open bugs for the src:linux package and thus we are
closing older bugs where it's unclear if they still occur in newer
versions and are still relevant to the reporter. For an overview see:
https://bugs.debian.org/src:linux .

If you can reproduce your issue with

- the current version in unstable/testing
- the latest kernel from backports

or, if it was a feature addition/wishlist and still consider it
relevant, then:

Please reopen the bug, see https://www.debian.org/Bugs/server-control
for details.

Please try to provide as much fresh details including kernel logs where
relevant. In particular were an issue is coupled with specific hardware we
might ask you to do additional debugging on your side as the owner of the
hardware.

Regards,
Salvatore

--- End Message ---
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