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Long and boring, lotus and tjaalton were testing different things for days on IRC

The discussion is a bit broken, part is on a bug report, https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1838644 The rest happened on Freenode IRC #ubuntu-kernel, the final bit was <tjaalton> Timo Aaltonen lotuspsychje: no need to test anything, since I know what's going on lotuspsychje: 5....

Any chance the problem machine has Ethernet using the r8169 kernel module? Indeed... e1000e 245760 0 r8169 81920 0 Can you try a 4.18 kernel to see if that works? I know they are EOL but they keep changing their minds on how to handle ASPM in r8169 upstream and Ubuntu might have cherry picked some ...

Hi, can anyone tell me how to reverse the process to turn WiFi Power Management back On? Background: I followed the forum entries to figure out how turn Power Management: Off (from On) -- I did this because I thought my wifi was being dropped (but my wifi router was just faulty). Since turning Powe...

Any chance the problem machine has Ethernet using the r8169 kernel module?

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sudo dkms remove rtlwifi-new/0.6 --all
sudo apt remove broadcom-sta-dkms
echo "options rtl8723be ant_sel=2 ips=N" | sudo tee /etc/modprobe.d/rtl8723be.conf

Reboot

https://en.wikipedia.org/wiki/Spiny_orb-weaver

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wget -N -t 5 -T 10 https://github.com/UbuntuForums/wireless-info/raw/master/wireless-info && chmod +x wireless-info && ./wireless-info
cat wireless-info.txt | nc termbin.com 9999

Post termbin URL

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sudo apt install git dkms build-essential
git clone https://github.com/cilynx/rtl88x2BU_WiFi_linux_v5.3.1_27678.20180430_COEX20180427-5959.git
sudo dkms add ./rtl88x2BU_WiFi_linux_v5.3.1_27678.20180430_COEX20180427-5959
sudo dkms install rtl88x2bu/5.3.1

Reboot and make sure Secure Boot is disabled

In terminal do

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echo "options rtl8723be ips=N ant_sel=2" | sudo tee /etc/modprobe.d/rtl8723be
sudo sed -i 's/3/2/' /etc/NetworkManager/conf.d/*

Reboot

After a kernel update you will need to do

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cd backport-iwlwifi
make clean
make
sudo make install

sudo apt-get install git git clone https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/backport-iwlwifi.git cd backport-iwlwifi make defconfig-iwlwifi-public sed -i 's/CPTCFG_IWLMVM_VENDOR_CMDS=y/# CPTCFG_IWLMVM_VENDOR_CMDS is not set/' .config sudo make install Reboot and make sure Secure Boot...

What about

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cat /etc/modprobe.d/ideapad-laptop.conf

Post results from terminal for

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 lsmod | grep ideapad; rfkill list

Quick fix is

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echo "blacklist ideapad_laptop" | sudo tee /etc/modprobe.d/ideapad-laptop.conf

Reboot

Where did you choose to install the boot manager to?

Try installing Mint without an internet connection as there are still issues with some UEFI installs when there are grub updates available

This happens in every Linux distro I know of with Broadcom wifi, it might be something in Broadcoms firmware for Linux that causes the limitation

On HP's you need to enter UEFI/BIOS settings, go to System Configuration, then OS Boot Manager. Then you move the Ubuntu entry to the top of the list and press F10 twice. For some reason changes made with efibootmgr are ignored on these newer HP's

I would guess the network that isn't detected is on a 2.4 GHz channel higher than channel 11. Can you change the channel being used?

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