[Pkg-utopia-maintainers] Bug#950576: network-manager fails to correctly configure eth0 speed and fails when autoneg is on

[Eric Valette]

Package: network-manager
Version: 1.22.6-1
Severity: critical
Justification: breaks unrelated software

If I let eth0 in /etc/network/interface I get my eth0 card correctly configured by ifplugd
each time using full duplex and 1000Mbps

ethtool eth0
Settings for eth0:
        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:  1000baseT/Full 
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: off (auto)
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

If I let network manager handle this interface and either set "allow autoneg" or disable
it and force  speed at 1000 I get no working interafce it keeps trying to configure
it in a loop.

The only config that works is:
    1) disable autoneg
    2) and set speed at 100Mbps

but this is not what I want and fisrt ethtool command shows the ethernet card is capable
of what I want.

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 5.4.17 (SMP w/8 CPU cores; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE
Locale: LANG=fr_FR.UTF8, LC_CTYPE=fr_FR.UTF8 (charmap=UTF-8), LANGUAGE= (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages network-manager depends on:
ii  adduser                3.118
ii  dbus                   1.13.12-2
ii  init-system-helpers    1.57
ii  libaudit1              1:2.8.5-2+b1
ii  libbluetooth3          5.52-1
ii  libc6                  2.30-0experimental1
ii  libcurl3-gnutls        7.67.0-2
ii  libglib2.0-0           2.63.3-3
ii  libgnutls30            3.6.12-1
ii  libjansson4            2.12-1
ii  libmm-glib0            1.10.4-0.1
ii  libndp0                1.6-1+b1
ii  libnewt0.52            0.52.21-4
ii  libnm0                 1.22.6-1
ii  libpam-systemd         244.1-2
ii  libpolkit-agent-1-0    0.116-2
ii  libpolkit-gobject-1-0  0.116-2
ii  libpsl5                0.20.2-2
ii  libreadline8           8.0-3
ii  libselinux1            3.0-1
ii  libsystemd0            244.1-2
ii  libteamdctl0           1.30-1
ii  libudev1               244.1-2
ii  libuuid1               2.34-0.1
ii  policykit-1            0.116-2
ii  udev                   244.1-2
ii  wpasupplicant          2:2.9-6

Versions of packages network-manager recommends:
ii  crda                         3.18-1
ii  dnsmasq-base [dnsmasq-base]  2.80-1.1
ii  iptables                     1.8.4-2
ii  modemmanager                 1.10.4-0.1
ii  ppp                          2.4.7-2+4.1+b1

Versions of packages network-manager suggests:
ii  isc-dhcp-client  4.4.1-2.1
pn  libteam-utils    <none>

-- no debconf information