Very slow WiFi connect after resume from suspend [Solved]

[Hallvor]

I have had this problem several times after resuming from suspend.* The WiFi will be connected to the network, but no traffic comes through. After a few minutes, everything works as usual. It is not a dealbreaker, just annoying.

The computer is a Lenovo Thinkpad X240 (not the one in my signature) with Intel 7260 WiFi.

Code: Select all

00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)
03:00.0 Network controller: Intel Corporation Wireless 7260 (rev 6b)

Errors from journalctl from the time this was happening:

Code: Select all

des. 19 11:56:34 debian-mini wpa_supplicant[815]: nl80211: Failed to open /proc/sys/net/ipv4/conf/p2p-dev-wlp3s0/drop_unicast_in_l2_multicast: No such file or directory
des. 19 11:56:34 debian-mini wpa_supplicant[815]: nl80211: Failed to set IPv4 unicast in multicast filter
des. 19 11:56:34 debian-mini nm-dispatcher[20246]: req:5 'down' [wlp3s0]: new request (2 scripts)
des. 19 11:56:34 debian-mini nm-dispatcher[20246]: req:5 'down' [wlp3s0]: start running ordered scripts...
des. 19 11:56:34 debian-mini nm-dispatcher[20246]: req:6 'connectivity-change': new request (2 scripts)
des. 19 11:56:34 debian-mini wpa_supplicant[815]: nl80211: Failed to open /proc/sys/net/ipv4/conf/p2p-dev-wlp3s0/drop_unicast_in_l2_multicast: No such file or directory
des. 19 11:56:34 debian-mini kernel: IPv6: ADDRCONF(NETDEV_UP): wlp3s0: link is not ready
des. 19 11:56:34 debian-mini wpa_supplicant[815]: nl80211: Failed to set IPv4 unicast in multicast filter
[...]
des. 19 11:59:30 debian-mini root[21300]: /etc/dhcp/dhclient-exit-hooks.d/zzz_avahi-autoipd returned non-zero exit status 1

It complains about a missing file. This is a very minimal install, so I may lack something important... Any ideas?

* I very rarely reboot the computer, so it is possible that there is a problem on fresh boots as well, as the problem comes and goes.

[Head_on_a_Stick]

Is this with NetworkManager?

Please post the output of

Code: Select all

systemctl list-unit-files --state=enabled

[shep]

The other thing to look at is power saving features:
https://wiki.archlinux.org/index.php/Po ... _(iwlwifi)
My realtek card dropped connections until I disable powersaving with a /etc/modprobe.d entry.

[Hallvor]

Yes, NetworkManager is installed and enabled. I am puzzled by the random loss of traffic. The computer worked fine when I woke up the computer from suspend now - and it usually works fine, like I mentioned.

Code: Select all

root@debian-mini:~# systemctl list-unit-files --state=enabled
UNIT FILE                                  STATE  
accounts-daemon.service                    enabled
anacron.service                            enabled
apparmor.service                           enabled
autovt@.service                            enabled
avahi-daemon.service                       enabled
blk-availability.service                   enabled
console-setup.service                      enabled
cron.service                               enabled
dbus-fi.w1.wpa_supplicant1.service         enabled
dbus-org.freedesktop.Avahi.service         enabled
dbus-org.freedesktop.ModemManager1.service enabled
dbus-org.freedesktop.nm-dispatcher.service enabled
dbus-org.freedesktop.timesync1.service     enabled
getty@.service                             enabled
haveged.service                            enabled
keyboard-setup.service                     enabled
lvm2-monitor.service                       enabled
ModemManager.service                       enabled
network-manager.service                    enabled
networking.service                         enabled
NetworkManager-dispatcher.service          enabled
NetworkManager-wait-online.service         enabled
NetworkManager.service                     enabled
nftables.service                           enabled
pppd-dns.service                           enabled
rsyslog.service                            enabled
syslog.service                             enabled
systemd-timesyncd.service                  enabled
tlp-sleep.service                          enabled
tlp.service                                enabled
udisks2.service                            enabled
unattended-upgrades.service                enabled
wpa_supplicant.service                     enabled
avahi-daemon.socket                        enabled
dm-event.socket                            enabled
lvm2-lvmpolld.socket                       enabled
remote-fs.target                           enabled
anacron.timer                              enabled
apt-daily-upgrade.timer                    enabled
apt-daily.timer                            enabled
fstrim.timer                               enabled
logrotate.timer                            enabled
man-db.timer                               enabled

43 unit files listed.

Code: Select all

root@debian-mini:~# systemctl status NetworkManager
● NetworkManager.service - Network Manager
   Loaded: loaded (/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2019-12-20 08:28:24 CET; 13min ago
     Docs: man:NetworkManager(8)
 Main PID: 814 (NetworkManager)
    Tasks: 4 (limit: 4915)
   Memory: 17.6M
   CGroup: /system.slice/NetworkManager.service
           ├─ 814 /usr/sbin/NetworkManager --no-daemon
           └─1547 /sbin/dhclient -d -q -sf /usr/lib/NetworkManager/nm-dhcp-helper -pf /run/dhclient-wlp3s0.pid -lf /var/lib/NetworkManager/dhclient-92909545-2a78-4268-838d-60fa21ae1e65-wlp3s0.

des. 20 08:29:18 debian-mini dhclient[1650]: XMT: Solicit on wlp3s0, interval 16790ms.
des. 20 08:29:34 debian-mini dhclient[1650]: XMT: Solicit on wlp3s0, interval 34970ms.
des. 20 08:29:47 debian-mini NetworkManager[814]: <warn>  [1576826987.2806] dhcp6 (wlp3s0): request timed out
des. 20 08:29:47 debian-mini NetworkManager[814]: <info>  [1576826987.2807] dhcp6 (wlp3s0): state changed unknown -> timeout
des. 20 08:29:47 debian-mini NetworkManager[814]: <info>  [1576826987.2829] dhcp6 (wlp3s0): canceled DHCP transaction, DHCP client pid 1650
des. 20 08:29:47 debian-mini NetworkManager[814]: <info>  [1576826987.2829] dhcp6 (wlp3s0): state changed timeout -> done
des. 20 08:38:24 debian-mini NetworkManager[814]: <info>  [1576827504.3732] device (wlp3s0): supplicant interface state: completed -> authenticating
des. 20 08:38:24 debian-mini NetworkManager[814]: <info>  [1576827504.3762] device (wlp3s0): supplicant interface state: authenticating -> associating
des. 20 08:38:24 debian-mini NetworkManager[814]: <info>  [1576827504.3883] device (wlp3s0): supplicant interface state: associating -> associated
des. 20 08:38:24 debian-mini NetworkManager[814]: <info>  [1576827504.3948] device (wlp3s0): supplicant interface state: associated -> completed

The other thing to look at is power saving features:
https://wiki.archlinux.org/index.php/Po ... _(iwlwifi)
My realtek card dropped connections until I disable powersaving with a /etc/modprobe.d entry.

I tried disabling the WiFi power saving feature on TLP. It was disabled on AC power, but enabled on battery. I'll let you know how it works out.

[Hallvor]

No trouble after disabling WiFi power saving. Marking thread as solved for now. Thanks!