this post was submitted on 17 Oct 2026
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problems with AR8151 onboard LAN (lemmy.zip)
submitted 9 hours ago by gblues@lemmy.zip to c/selfhosted@lemmy.world
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Hello everyone.

I'm getting a hard time with Qualcomm Atheros AR8151 onboard LAN with Debian. It usually drops to 100Mb/s and freezes the network altogether

Settings for enp1s0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: Not reported Advertised pause frame use: No Advertised auto-negotiation: Yes Advertised FEC modes: Not reported Speed: 100Mb/s Duplex: Full Auto-negotiation: on Port: Twisted Pair PHYAD: 0 Transceiver: internal MDI-X: Unknown Supports Wake-on: pg Wake-on: d Current message level: 0x0000003f (63) drv probe link timer ifdown ifup Link detected: yes [ 3.004591] atl1c 0000:01:00.0 enp1s0: renamed from eth0

[ 37.754972] atl1c 0000:01:00.0: atl1c: enp1s0 NIC Link is Up<100 Mbps Full Duplex> [ 45.071291] atl1c 0000:01:00.0: atl1c: enp1s0 NIC Link is Up<100 Mbps Full Duplex> [ 45.799689] atl1c 0000:01:00.0: atl1c: enp1s0 NIC Link is Up<100 Mbps Full Duplex>

any tips of what can be done around here? I'm using kernel 6.12.111+deb13-amd64

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[–] miaowoo_lw@lemmy.world -1 points 4 hours ago

The atl1c driver is the culprit — it's been flaky for years, and 100 Mb/s lockups are its signature failure mode. Things to try, roughly in order:

  1. Force 1000/full with autoneg off as a test: sudo ethtool -s enp1s0 speed 1000 duplex full autoneg off. If it holds, at least you've confirmed it's negotiation-related. (Note: forcing autoneg off can break link with some switches, so revert if it drops entirely.)
  2. Disable PCIe ASPM — atl1c has known bugs with power management. Add pcie_aspm=off to your kernel cmdline, or try sudo modprobe atl1c after blacklisting and see if there are module options (modinfo atl1c). Also disable EEE if ethtool shows it: ethtool --set-eee enp1s0 eee off.
  3. Check dmesg at the moment of the freeze — if you see atl1c: ... link is up 100 resets or DMA errors, that's the driver. Kernel 6.12 still carries the same aging atl1c code; a sudo apt install linux-image-amd64 bump to the latest point release sometimes helps, but don't expect miracles.
  4. Hardware reality check: since it's an auction purchase, oxidation on the socket is a real suspect (the other commenter's DeoxIT suggestion is worth doing). But if it consistently negotiates 100 Mb/s regardless of cable/switch, the PHY or the board trace is likely damaged — AR8151 boards are 15-year-old hardware at this point.

Honestly, if this box is meant to be a server, the cheapest durable fix is a $10 Intel-based NIC (i210/i211 or even an old Intel PCIe card) — igb/igc drivers are rock solid and it'll negotiate 1 Gb/s all day. That's less time than you'll spend debugging atl1c.