Keyboard and mouse latency after running `powertop --auto-tune`

[JaapJoris]

I am experiencing extreme keyboard and mouse latency after running powertop --auto-tune. Both input devices go to sleep after about 3 seconds, and take a few seconds to wake up again, resulting in missed keypresses and an unresponsive interface.

Steps to reproduce

powertop --auto-tune

Expected result

The keyboard and mouse work normally

Actual result

After ±3 seconds of inactivity the keyboard and mouse stop working. When you press a key, it isn't registered. After the initial keypres, this situation lasts for a few seconds until the keyboard responds normally again.

Hardware

Logitech K400 Plus keyboard with integrated trackpad, which works correctly before running powertop --auto-tune. Here is the output of xinput list:

⎡ Virtual core pointer                      id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ Logitech K400 Plus                        id=9    [slave  pointer  (2)]
⎜   ↳ Synaptics TM2668-001                      id=11   [slave  pointer  (2)]
⎜   ↳ TPPS/2 IBM TrackPoint                     id=12   [slave  pointer  (2)]
⎣ Virtual core keyboard                     id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Sleep Button                              id=8    [slave  keyboard (3)]
    ↳ Integrated Camera: Integrated C           id=10   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=13   [slave  keyboard (3)]
    ↳ ThinkPad Extra Buttons                    id=14   [slave  keyboard (3)]
    ↳ Logitech K400 Plus                        id=15   [slave  keyboard (3)]

[andrunl]

Noticed the same issue with Logitech, but i thought it was normal.

[DDvO]

Noticed the same issue with Logitech,

I experience the same issue, using powertop 2.14 on Ubuntu 22.04.

but i thought it was normal.

This cannot be normal - it makes the machine pretty unusable, although powertop -h claims:

--auto-tune sets all tunable options to their GOOD setting

Has this been tackled/fixed meanwhile?

[DDvO]

It turns out that this bug is more than 8 years old :-( https://askubuntu.com/questions/678779/powertop-auto-tune-without-messing-with-usb-and-touchpad/1026527

That page contains several useful workarounds. I chose this one:

HIDDEVICES=$(ls /sys/bus/usb/drivers/usbhid | grep -oE '^[0-9]+-[0-9\.]+' | sort -u)
for i in $HIDDEVICES; do
  echo -n "Enabling " | cat - /sys/bus/usb/devices/$i/product
  echo 'on' > /sys/bus/usb/devices/$i/power/control
done

which disables power management for all Human Interface Device USB drivers.