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I'm on precision 5530, i9, 32GB RAM, SSD, using nvidia drivers. When booting I have no performance issues. But if I suspend then resume I see performance and lag drop considerably.

I saw online this might be cpu throttling, but running cpupower frequency-info yields

analyzing CPU 0:

  driver: intel_pstate

  CPUs which run at the same hardware frequency: 0

  CPUs which need to have their frequency coordinated by software: 0

  maximum transition latency:  Cannot determine or is not supported.

  hardware limits: 800 MHz - 4.80 GHz

  available cpufreq governors: performance powersave

  current policy: frequency should be within 800 MHz and 4.80 GHz.

              The governor "powersave" may decide which speed to use

              within this range.

  current CPU frequency: Unable to call hardware

  current CPU frequency: 3.80 GHz (asserted by call to kernel)

  boost state support:

    Supported: yes

    Active: yes

It doesn't seem to be throttled but everything is obviously slow.

I do see that the chrome gpu-process is using up 50-100% CPU, which is suggestive.

I didn't have this problem on 18.10.

What might cause this and how can I debug and fix?

Use sudo -H gedit /lib/systemd/system-sleep/custom-xhci_hcd

Copy these lines into the editor:

#!/bin/bash



# Original script was using /bin/sh but shellcheck reporting warnings.



# NAME: custom-xhci_hcd

# PATH: /lib/systemd/system-sleep

# CALL: Called from SystemD automatically

# DESC: Suspend broken for USB3.0 as of Oct 25/2018 various kernels all at once



# DATE: Oct 28 2018.



# NOTE: From comment #61 at: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/522998



TMPLIST=/tmp/xhci-dev-list



# Original script was: case "${1}" in hibernate|suspend)



case $1/$2 in

  pre/*)

    echo "$0: Going to $2..."

    echo -n '' > $TMPLIST

          for i in `ls /sys/bus/pci/drivers/xhci_hcd/ | egrep '[0-9a-z]+:[0-9a-z]+:.*$'`; do

              # Unbind xhci_hcd for first device XXXX:XX:XX.X:

               echo -n "$i" | tee /sys/bus/pci/drivers/xhci_hcd/unbind

           echo "$i" >> $TMPLIST

          done

        ;;

  post/*)

    echo "$0: Waking up from $2..."

    for i in `cat $TMPLIST`; do

              # Bind xhci_hcd for first device XXXX:XX:XX.X:

              echo -n "$i" | tee /sys/bus/pci/drivers/xhci_hcd/bind

    done

    rm $TMPLIST

        ;;

esac

Save the file and exit the editor. Then use:

sudo chmod a+x /lib/systemd/system-sleep/custom-xhci_hcd

After rebooting your suspend / resume issues will hopefully be resolved. If not let me know and I'll delete this answer.