Hi,
I just installed KDE Neon and GPU driver for my NVidia GT 820M.. I installed the nvidia-driver-390 - distro non-free recommended.
Why does it show just an intel driver?. Should I try to reinstall the system or what do you recommend? I know that I allowed secure boot by mistake, but then I disabled it, purged nvidia drivers and installed it again...

l

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ukas@lukas-X750LN:~$ lspci -k | grep -A 2 -i "VGA"
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 09)
        Subsystem: ASUSTeK Computer Inc. Haswell-ULT Integrated Graphics Controller
        Kernel driver in use: i915
lukas@lukas-X750LN:~$ sudo prime-select nvidia
Info: the nvidia profile is already set
lukas@lukas-X750LN:~$ sudo ubuntu-drivers devices
== /sys/devices/pci0000:00/0000:00:1c.4/0000:04:00.0 ==
modalias : pci:v000010DEd00001341sv00001043sd000014FDbc03sc02i00
vendor   : NVIDIA Corporation
model    : GM108M [GeForce 840M]
driver   : nvidia-340 - distro non-free
driver   : nvidia-driver-390 - distro non-free recommended
driver   : xserver-xorg-video-nouveau - distro free builtin

== /sys/devices/pci0000:00/0000:00:1c.2/0000:02:00.0 ==
modalias : pci:v000014E4d00004365sv000011ADsd00006605bc02sc80i00
vendor   : Broadcom Limited
model    : BCM43142 802.11b/g/n
driver   : bcmwl-kernel-source - distro non-free

lukas@lukas-X750LN:~$

On official ubuntu gnome it worked
Thank you for your advices a lot, I am lost and don't want to use windows again, never... If you need more info or terminal outpon, no problem.
Lukas.

Lol, it's recognized as 3D controller only...

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sudo lspci
00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 09)
00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 09)
00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04)
00:16.0 Communication controller: Intel Corporation 8 Series HECI #0 (rev 04)
00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 1 (rev e4)
00:1c.2 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 3 (rev e4)
00:1c.3 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 4 (rev e4)
00:1c.4 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 5 (rev e4)
00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1 [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04)
02:00.0 Network controller: Broadcom Inc. and subsidiaries BCM43142 802.11b/g/n (rev 01)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)
04:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 840M] (rev ff)

still doesn't work, I can't f*** that, going to reinstall the system again

I reinstalled the system, but it still didn't work..

Now, problem is solved
So I switchet to Debian with XFCE and installed drivers with Bumblebee and everything works fine, link here: https://wiki.debian.org/Bumblebee
The problem probably could be solved in KDE Neon too, with this article: https://wiki.ubuntu.com/Bumblebee.
Bye KDE, maybe later I love you