[SOLVED] Internet speed is capped at 100/100 Mbps (after BIOS update)

earthw0rmjim · 08-07-2019, 11:48 PM

Not sure if the problem is actually related to the BIOS update, but i've recently done one including a CMOS reset.
I'm using Debian 10 (stable) and have a 500/200 Mbps internet connection, which is now seemingly capped at 100/100 Mbps.
I'm using the exact same UTP cable as before, but have tried with other cables as well and the result is the same.
My mobo is an Asrock B450 Pro4, the related specs are as follows:

Quote:

- PCIE x1 Gigabit LAN 10/100/1000 Mb/s
- Realtek RTL8111H

Code:

# ethtool enp8s0

Settings for enp8s0:
	Supported ports: [ TP AUI BNC MII FIBRE ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Full 
	Supported pause frame use: Symmetric Receive-only
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Full 
	Advertised pause frame use: Symmetric Receive-only
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Link partner advertised link modes:  10baseT/Half 10baseT/Full 
	                                     100baseT/Half 100baseT/Full 
	                                     1000baseT/Full 
	Link partner advertised pause frame use: Symmetric
	Link partner advertised auto-negotiation: Yes
	Link partner advertised FEC modes: Not reported
	Speed: 1000Mb/s
	Duplex: Full
	Port: MII
	PHYAD: 0
	Transceiver: internal
	Auto-negotiation: on
	Supports Wake-on: pumbg
	Wake-on: g
	Current message level: 0x00000033 (51)
			       drv probe ifdown ifup
	Link detected: yes

Code:

# lshw -C network

  *-network                 
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:08:00.0
       logical name: enp8s0
       version: 15
       serial: 70:85:c2:be:21:ba
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp aui bnc mii fibre 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 duplex=full ip=192.168.1.128 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
       resources: irq:38 ioport:d000(size=256) memory:fcb04000-fcb04fff memory:fcb00000-fcb03fff

A speedtest result is attached as well.

I would like to figure out if this is a BIOS/hardware/ISP problem or misconfiguration on my part.

I'd really appreciate any advice, thank you in advance.

business_kid · 08-08-2019, 04:35 AM

First thing I'd do is check with the provider that they haven't limited it at their end. With an 8111 nic, you should be running on the r8169 module, I'd set up a local test before condemning the bios.

earthw0rmjim · 08-08-2019, 04:38 AM

It was a router problem.
I've restarted it, plugged the cable in another port and it seems to be working fine now.

Youngunsung · 12-05-2022, 05:32 AM

My broadband speed was capped at 100MBPS

Took more than a month to figure this out.
The ethernet cable may support top speed of 100 MPS.
Bought a CAT 6 Ethernet cable - desktop now supports speeds of upto 1 GBPS!