on my laptop samsung RV520 with nvidia GEFORCE GT 520M I tried to upgrade to leap 15 from 42.3, but it installed nouveau with a very bad resolution that cannot be changed via systemsettings, so, I installed the nvidia repository and installed nvidia drivers, but now I have black screen.
how can I solve??
Laptop with hybrid graphics will need bumblebee
here not hybrid grphics, and bumblebee wasn’t installed in 42.3
So the Intel CPU does not have a GPU?? This is normally what is called an optimus system and is hybrid graphics ie Intel+NVIDIA
it seems not, it has only nvidia graphics and no optimus, no optimus is written enywhere and when there was 42.3 nvidia graphics worked fine without bumblebee
from the technical specification:
"GraficaProcessore grafico NVIDIA® GeforceTM GT 520M
1 GB gDDR3 (grafica dedicata) Memoria
Chipset principale
Chipset Intel HM65
"
According to this page your notebook seems to be of the “Optimus” type, with Intel graphics integrated in the processor (i3 2310M?).
So if you install the Nvidia proprietary driver you NEED Bumblebee AFAIK.
A default Leap 15 install should work without proprietary drivers though and at boot the Intel graphics should be engaged, with the Nvidia chip powered off.
Then you should be able to engage the Nvidia chip via DRI_PRIME and Nouveau; if that does not give the performance you need, maybe we can try to troubleshoot that.
Also please note that if you are using Gnome, Leap 15 Gnome defaults to using Wayland now and that might not be suitable to every laptop.
according to that page the mine seems to be this:
Samsung RV520-S01
Specifiche tecniche
Samsung RV520-S01Notebook: Samsung RV520-S01
Processore: Intel Core i3 2310M
Scheda grafica: NVIDIA GeForce GT 520M
Schermo: 15.6 pollice, 16:9, 1366 x 768 pixels
Peso: 2.7kg
…I’m using KDE, and yes, after the failed upgrade I installed a default leap 15.0 without formatting /home, it worked quite well with nouveau, so I installed the nvidia driver and it worked well.
two things, the first is that the upgrade was very long and annoying becouse the about 7 hundreds software conflicts to click for allow the vendor change from pacman or KDE:extra or KDE –> opensuse, sometimes as option 2 other times as option 1. I think there should be an option to choose to allow all vendor changes to opensuse in all software conflicts in one click.
the second I was worried that the upgrade didn’t worked, in the past it worked always verywell, becouse this laptop is for test and I have to reinstall only one printer and two networks and ok, and a list of 4000 software, some already installed by leap 15.0, that is in this case for me simple with some very simple script I did; but I have other laptops, without optimus, where I have to reinstall several printers and scanners and networks and this is very annoying and as I know there isn’t a way to backup and reinstall printers, scanners and networks.
so I think to backup the entire partition and try to upgrade to leap 15.0 enabling the nvidia repository during the upgrade to allow the upgrade also of nvidia drivers avoiding to involve nouveau, hoping that this works, …what do you think about?
OK, at least you have a good starting point (we know now that a default Leap 15 install works).
There are two issues that may cause trouble with a smooth upgrade in your setup:
1- your laptop seems to use an unusual configuration (the graphics part integrated in the i3 processor is disabled in the BIOS?)
2- you seem to be using a few non-standard, community repos (Packman, KDE, KDE:extra?).
That scenario maybe was not fully tested during the beta phase, so your mileage might vary.
A few considerations may help you.
1- Leap 15 has a few key differences from 42.x, some in the graphics area, so an upgrade with an unusual configuration might leave some debris behind, not uninstalled by the upgrade process itself: look for packages still installed in the system but not listed in the Leap 15 repos.
2- follow thoroughly an official guide like https://en.opensuse.org/SDB:System_upgrade
3- disable all “community” repos that you are not using and make sure to switch version in those you actually use (to avoid 700+ conflicts)
4- keep your fingers crossed: an upgrade with extra repos enabled is never guaranteed to work.
lol!
may be, I don’t know, I’ll try to see if in the bios is indicated, but, if a default leap15.0 installation works it should indicate that only the nvidia graphics is active
yes, and also others
2- I I followed 
3- you intend to disable all community repos and switch to the standard before the upgrade? …good option manythanks
4- finger crossed, …and the only extra repo could be the nvidia repo
…may be another option could be to uninstall nvidia repo before upgrade? then upgrade and then reinstall nvidia?
Agree.
3- you intend to disable all community repos and switch to the standard before the upgrade? …good option manythanks
4- finger crossed, …and the only extra repo could be the nvidia repo
…may be another option could be to uninstall nvidia repo before upgrade? then upgrade and then reinstall nvidia?
If you can afford it, the following process usually guarantees success:
1- switch all packages to the standard repos (OSS, non-OSS and their respective update repos);
2-(if needed) uninstall nvidia;
3- disable all non-standard repos;
4- update the system (i.e. to the last versions provided in 42.3 repos);
5- switch all repos to the Leap 15 version (but leave community repos disabled);
6- upgrade the system (i.e. to the Leap 15 version);
7- check for “orphaned” packages and possibly uninstall them (be careful, they show up in red in YaST-Software);
8- add desired community repos back, starting with packman and nvidia (make sure they are in the Leap 15 version);
9- switch desired packages to the “community” version (easy with the “switch packages to this repo” option in YaST-Software).
Sorry I cannot reproduce your setup and check it myself, so be careful and do it at your own risk.
manythanks, I will do so lol! and double crossed fingers
ok, it seems it went better 
I tried to upgrade to leap 15.0 from 42.3 the same hardware as above
- tried to switch all packages to the standard repos (OSS, non-OSS and their respective update repos) to avoid to answer to hundreds of software conflicts to click for allow the vendor change from pacman or KDE:extra or KDE → opensuse during the upgrade, but the effort was very similar and more complicate becouse the questions about software conflict was not so simple, so I didn’t switch.
- updated all 42.3 software
- uninstalled nvidia drivers
- start the upgrade
- switched from removed to disabled all the non standard repos during the upgrade (I didn’t swiched before becouse I know that upgrade would ask me during )
- solved the hundreds of software conflicts clicking to allow the vendor change from pacman or KDE:extra or KDE → opensuse (this is very annoying but less annoying and less complcate than switch packages becouse you only have to choose to allow vendor change)
- I think the most important answer NO to this http://paste.opensuse.org/view/download/4722866
- and I answered here http://paste.opensuse.org/view/download/6421340 option 2) remove the block to allow the remove of Mesa-dri-nouveau-17.0.5…ecc the option 1)was do not install Mesa-18.0.2…ecc
I don’t know if it was the correct answer but it worked
- the upgrade went fine without errors
- I reenabled the repos changing only 12.3 to 15.0 at the end
- I reinstalled nvidia drivers
- I started to switch packages to packman and others
I didn’ perform this -check for “orphaned” packages and possibly uninstall them (be careful, they show up in red in YaST-Software); I will do may be
Manythanks orso
Nice to see you are up and running on 15! Indeed your choices in step 7) and 8) were the correct ones 