Lenovo L340 Ubuntu 20.10/Linux problems: Brightness + Wifi + Suspension (+Battery opt

[julio-netu]

I'll request help and try to organize here any information on issues regards Lenovo L340 (my specific model is 81tr003br) with current Ubuntu 20.10 Kernel 5.8.0-44-generic

1. Brightness (backlight) can't be changed.
I've tried some tweaks, but nothing seems to work.
I'm using the following program as a workaround:

sudo apt install brightness-controller

This won't fix anything but works to change brightness until system is restarted

> I have already tried an early Ubuntu 21.04 live image, still the same problem.

> I already tried Noveau and Nvidia drivers, nothing changed.

This bug was already addressed (not solved):
https://bugs.launchpad.net/ubuntu/+s...x/+bug/1863407



2. System can't resume from suspension.

Maybe some advanced tweaks with kernel and all that can fix it, but I haven't tried then yet.



3. Wifi sometimes doesn't work.

Wifi seems to work fine, but sometimes it just won't work after system boot, usually it will work after restart.

Workaround: turn wifi off and on again seems to fix this problem in the current session.


4. Batery

Batery consumption is within "normal", which gives around 3:30 hours of not intensive use. But Ubuntu lacks any preinstalled tweak to improve battery consumption. Later i'll try auto-cpufreq and TLP.

5. Touchpad hotkey toggle (F6 or FN+F6) doesn't work