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Greetings,
I've recently tried putting my desktop installation to sleep (suspend) via KDE "start" menu the system is really slow after waking up.

When I try to open any application through the taskbar, desktop icon, or "start menu" it takes almost a minute to start the said program. Restarting fixes the issue but then suspending loses its purpose. I've seen someone suggest that turning off and back on swap could help so I've tried checking if this might be a swap issue but my swap partition is empty, so that didn't help.

I've already tried looking for the same issue online but the reason why people always had this problem was that cpupower kept their CPU clock low as it would be still asleep. I have the cpupower service disabled (because it was throwing errors at the startup that it cannot start) and when I check the current CPU clock after resuming from suspend the cpu clock rate is nominal. I'm really out of ideas what can be causing this issue.

Thanks in advance for your replies
Cheers

Would be helpful if you could add at least the output of

Code: Select all: free -ltm

Next time your box wakes up from suspend, please start such an affected application via terminal via strace, and post the output here.
As an example for e.g. kwrite - this will write the strace output to kwrite.log

Code: Select all: strace -Ttt -o kwrite.log kwrite

After kwrite has started, simply close it, and then later upload the resulting logfile here.

Apart from that, In general I can't reproduce - usually I also suspend my box, and nothing is slow after waking up again.

Greetings,
sorry for the late response, somehow I completely missed the notification email. Anyway I ran the commands you suggested so here are the outputs.

Code: Select all: magicd3vil@localhost ~> free -ltm total used free shared buff/cache available Mem: 24091 8312 527 745 15251 14644 Low: 24091 23564 527 High: 0 0 0 Swap: 8191 0 8191 Total: 32283 8312 8719

Code: Select all: magicd3vil@localhost ~> strace -Ttt -o kwrite.log kwrite _IceTransSocketUNIXConnect: Cannot connect to non-local host linux.local _IceTransSocketUNIXConnect: Cannot connect to non-local host linux.local Qt: Session management error: Could not open network socket

Cheers

FWIW, you may want to set a proper hostname instead of linux.local. From what I can see the delays may be due to hostname change during/after suspending.

Apart from that, did you change any VMM or swappiness-related settings? Looks strange that from 24GB RAM only 8GB are used but only 512MB is actually free.

I've set the swap for 8GB manually because as far as I've seen the swap is not being really used anymore because I have enough RAM.

I have no idea why is my hostname set to linux.local instead of localhost. Not only I don't like it but I had a few issues in the past because of it too. I did not set the hostname manually so it must have come in like that with the install. Any tips on how to change it?

Code: Select all: magicd3vil@linux ~> cat /etc/hostname localhost.localdomain magicd3vil@linux ~> cat /etc/hosts 127.0.0.1 localhost.localdomain localhost ::1 localhost magicd3vil@linux ~>

Check whether you obtain your hostname via DHCP, if not you can simply set it to what you want as root via hostnamectl set-hostname
Afterwards reboot once.

Okay I've been getting the hostname from DHCP so I've set hostname-mode=none in /etc/NetworkManager/NetworkManager.conf and now I finally have "localhost" as my hostname again. Matter of fact it also fixed the sluggishness of the system after waking up. Thanks, Dok!

The only problem with suspending I have now is that the Network Manager does not show any connections (even cable-connected) after waking up and it takes around a minute or two for it to reconnect. Any suggestions?

What network manager frontend do you use? Default should be plasma-applet-nm which works just fine here after returning from suspend.
It immediately shows that wireless has been disconnected, and then reconnects a few seconds later.

I'm using plasma-applet-nm and I'm setting my networks up via the "Connections - System Settings Module" (System monitor says "Command: /usr/bin/kcmshell5 kcm_networkmanagement"). I hope that helps.

Well, you could let a terminal run with

Code: Select all: journalctl -u NetworkManager.service -f

as root and post the output after resuming from suspend, but please mention the timestamp when you suspend/resumed and when the network connection actually comes back (or when you see the indicator for that).

Suspend: 13:20
Wake-up: 13:21
Reconnected: 13:22

It took around a minute for the connection to be re-established.

Well, there's nothing in the logs inbetween, suspend starts at 13:20:40 and next timestamp is directly wakeup at 13:22:32.

pro 13 13:20:40 localhost NetworkManager[2110]: <info> [1607862040.2357] manager: NetworkManager state is now ASLEEP
pro 13 13:20:40 localhost NetworkManager[2110]: <info> [1607862040.2359] device (enp4s0): state change: activated -> deactivating (reason 'sleeping', sys-iface-state: 'managed')
pro 13 13:20:40 localhost NetworkManager[2110]: <info> [1607862040.2405] device (enp4s0): state change: deactivating -> disconnected (reason 'sleeping', sys-iface-state: 'managed')
pro 13 13:20:40 localhost NetworkManager[2110]: <info> [1607862040.2407] dhcp4 (enp4s0): canceled DHCP transaction
pro 13 13:20:40 localhost NetworkManager[2110]: <info> [1607862040.2407] dhcp4 (enp4s0): state changed bound -> done
pro 13 13:20:40 localhost NetworkManager[2110]: <info> [1607862040.2672] device (enp4s0): state change: disconnected -> unmanaged (reason 'sleeping', sys-iface-state: 'managed')
pro 13 13:20:40 localhost NetworkManager[2110]: <info> [1607862040.2790] device (tun0): state change: activated -> unmanaged (reason 'connection-assumed', sys-iface-state: 'external')
pro 13 13:20:40 localhost nm-openvpn[6345]: event_wait : Interrupted system call (code=4)
pro 13 13:20:40 localhost NetworkManager[2110]: <info> [1607862040.3128] vpn-connection[0xc58160,fc2b43f9-2ce0-4bad-b820-4e67a3b82db3,"michael",0]: VPN plugin: state changed: stopping (5)
pro 13 13:20:40 localhost NetworkManager[2110]: <info> [1607862040.3130] vpn-connection[0xc58160,fc2b43f9-2ce0-4bad-b820-4e67a3b82db3,"michael",0]: VPN plugin: state changed: stopped (6)
pro 13 13:20:40 localhost nm-openvpn[6345]: SIGTERM[hard,] received, process exiting
pro 13 13:20:40 localhost NetworkManager[2110]: <warn> [1607862040.3259] dns-sd-resolved[0xbcb460]: send-updates failed to update systemd-resolved: GDBus.Error:org.freedesktop.resolve1.NoSuchLink: Link 3 not known
pro 13 13:22:32 localhost NetworkManager[2110]: <info> [1607862152.4459] manager: sleep: wake requested (sleeping: yes enabled: yes)

Also if you want to figure this out, better provide some more details around your network setup, and there are seemingly multiple wireless adapters, a wired adapter as you mentioned and also a VPN connection before suspend.
You might need to post what you currently have as /etc/sysconfig/network-scripts/ifcfg-* configs and also the networkmanager connections ( nmcli -p -f all con show )

Here you go! Hope that helps :) Btw I am not using any wireless connections, just wired ethernet cable and OpenVPN.

Code: Select all: ====================================== NetworkManager connection profiles ====================================== NAME UUID TYPE TIMESTAMP TIMESTAMP-REAL AUTOCONNECT AUTOCONNECT-PRIORITY READONLY DBUS-PATH ACTIVE DEVICE STATE ACTIVE-PATH SLAVE FILENAME -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- michael fc2b43f9-2ce0-4bad-b820-4e67a3b82db3 vpn 1607880224 Ne 13. prosince 2020, 18:23:44 CET no 0 no /org/freedesktop/NetworkManager/Settings/3 yes enp4s0 activated /org/freedesktop/NetworkManager/ActiveConnection/2 -- /etc/NetworkManager/system-connections/michael.nmconnection Ethernet Cable b325fd44-30b3-c744-3fc9-e154b78e8c82 ethernet 1607880224 Ne 13. prosince 2020, 18:23:44 CET yes 0 no /org/freedesktop/NetworkManager/Settings/1 yes enp4s0 activated /org/freedesktop/NetworkManager/ActiveConnection/1 -- /etc/sysconfig/network-scripts/ifcfg-enp4s0 tun0 3fe5eee6-7ff4-4831-b5f7-22ea49a94c33 tun 1607880224 Ne 13. prosince 2020, 18:23:44 CET no 0 no /org/freedesktop/NetworkManager/Settings/4 yes tun0 activated /org/freedesktop/NetworkManager/ActiveConnection/3 -- /run/NetworkManager/system-connections/tun0.nmconnection System tun0 0519e245-81cf-1986-5daa-a824061bc6e8 ethernet 0 never no 0 no /org/freedesktop/NetworkManager/Settings/2 no -- -- -- -- /etc/sysconfig/network-scripts/ifcfg-tun0

If you don't use wireless connections, you should check why you have 2 wireless interfaces defined, wlp0s22f2u1 and wlp2s0u1 which also produce errors as seen in your logs.
You should try removing them as root via drakconnect --del

Also try first suspending / resuming without your VPN active. Apart from that, you would probably need to attach a full journalctl log excerpt starting shortly before you suspend, until the network is back after resuming.

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