After update everything is black again , try to reinstall 340xx-dkm some error, gdm was starting only with Gnome (Wayland),and blinking courser. gnome-Xorg and -classic falling back to gdm. guess have to reinstall with no gnome???
Iām in camp AMD, so am not sure what to advise about Nvidia, but note that there are particular issues going on with Nvidia right now, to do with the kernel. I donāt know if nvidia needs settings reinstalled each time there are updates.
Iād do a search on ānvidiaā here, and wait until some wise Nvidians comment. Thereās a thread where Jonathan, I think, has packaged the nvidia drivers for the kernel, so run a search and hopefully something can work out. Running wayland is probably going to be part of the problem though, as ricklinux is saying, and some cards can have some issues even with xorg, as kresimir is saying.
My gut feeling is to keep things simple, especially when there are kernel/nvidia issues right now ā¦ start with basic xorg, not wayland, and use the endeavour nvidia installer, and try offline xfce first or anything not gnome (incase there are some bugs with that too right now)? Just until these nvidia issues are sorted. Other than that, I hand it over to the Nvidia whizzkids to advise you further, and hopefully youāre up and running very soon. 
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after some hours trying to solve the problem,incl. reading, deleted all nvidia and linux and installed
linux-lts and the 340xx-dkms driver from the AUR,which i couldnāt before,my machine running again.
But today another update is available and i am getting confused what to do:
to install are : linux-headers 5.9.2.arch1-1 (5.9.1.arch1-1); linux-lts 5.4.73-1 (5.4.72-1) ;
linux-lts-headers 5.4.73-1 (5.4.72-1) .
If i understand the problem I shouldānt install the first : linux-headers 5.9.2.arch1-1
is this okay??? thanks for help
Iām not sure? Do you have only the lts kernel installed? Or do you have both the current kernel installed and the lts kernel? If so headers would be required for the standard current kernel also which is normally already installed. I donāt want to tell you yes and have you not booting again. If you have both kernels installed are you able to boot back and forth into each? Also there is a kernel update this morning for the current kernel. I am running on:
[ricklinux@eos-kde ~]$ uname -a
Linux eos-kde 5.9.2-arch1-1 #1 SMP PREEMPT Thu, 29 Oct 2020 17:01:28 +0000 x86_64 GNU/Linux
[ricklinux@eos-kde ~]$
Linux headers are also installed for this kernel.
You can keep multiple kernels installed, and just select the one you want to use when you boot (in your case, it looks like currently thatās the LTS kernel).
[wolf@wolf-imac101 ~]$ uname -r 5.4.72-1-lts, having only lts,
guess my problem is nvidia in kernel 5.9
so I should not update linux-headers 5.9.2.arch1-1 (5.9.1.arch1-1) or ???
If you never update the kernel, youāll never get the support when it is added.
As I understand it, 5.4 (LTS) works for you, but so far 5.9 doesnāt. You have both kernels installed, but you have chosen to boot from 5.4.
Updating the kernel/headers youāre not using will have no effect on the one that you are using.
Iām not having any issue on my newer GTX1060 desktop card as far as booting and working on the current kernel. Supposedly the drivers donāt work for cuda and opencl for gaming etc? Canāt speak for others and different older hardware running on 340.xx drivers.
Okay,after last update everything works fine, thanks for helping
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