Running Leap 42.3 with KDE Plasma Version 5.8.7, KDE Frameworks Version 5.32.0, Qt Version 5.6.2, Kernel Cersion 4.4.180-102-default, and with Radeon Saphire HD6450 2G DDR3, PCI-E SKU 11190-09-20G. Display has been set in Grub to video= 1920x1080 @60 Hz and this was working well until a recent update when my screen reverted to VGA 640 x 480 which makes life difficult. Switching to IceWM brought the screen back to required resolution. No idea what is wrong but thought somebody might need to know.
Have you tried changing the display resolution in KDE ?
System Settings -> Display and Monitor - Displays
Hi Paul and thanks for the reply. I have tried many things but couldn’t get anywhere whereas IceWM and a live boot to antiX both worked fine. I have looked at the news and see that 42.3 support will shortly stop so, as I type, zypper dup is running and downloading 5771 files for Leap 15.0. Hope it they all work. Regards, Budge
OK - Yes, probably a sensible move, 42.3 is end of life at the end of, this month, I believe.
5771, 5770, 5769 … 
Well I’m back again and now on Leap 15.0. Very relieved to report that zypper dup with the four basic repos has actually worked. Still no joy with graphics so I have logged into IceWM and so far so good. A few logos empty (plain white blobs) but working. Will get my multimedia set up and then try and sort out the rest. I shall now report on Leap 15.0. Hoorah!!!
I only upgraded to Leap 15.0 myself quite recently, although 15.1 has been released I’ll stay with 15.0 for a while longer - I’m a late adopter when it comes to the stable releases
Just to clarify. - The resolution is correct on the grub menu and the sddm login screen, it’s only after you have logged into KDE the resolution changes?
As well as checking the KDE resolution setting I outlined in post #2 it might be worth also taking a look at “System Settings -> Desktop Behaviour -> Desktop Effects - Zoom” to ensure that’s switched off.
Have you tried with a new user?
Note that this is a fork of a Hardware thread, where the same question was asked but unanswered. That IceWM works at 1920x1080 clearly indicates this is a KDE issue. Answering the twice asked question would clarify whether it is a KDE software issue or a personal KDE settings problem.
Hi Paul, sorry for the delay but upgrading on laptop required new installation (not this machine) as it all went pear shaped.
First:-
I have set up a new user and this seems to work OK with correct display resolution.
Second:- When I looked at the Desktop Effects settings with this new user the zoom was switched on but this new user resolution is still OK. I have now switched off zoom. Will log out and go back to original user.
Regards,
Logged into my own account and display is back to VGA 640x480. Checked the settings and zoom was turned on so I have turned it off but clearly that didn’t make any difference when I was logged in as a new user. It is clear my own settings are what have screwed things up. Where do I start?
Maybe delete the files in ~/.local/share/kscreen/
Have had another look at this and I do not recognise the information. All it shows is a screen locker menu. No sign of resolutions or anything else.
When I log in as testuser all is OK and it shows three menu items, Displays, Compositor and Gamma and Displays shows my preferred 1920 x 1080 resolution. So I conclude this is what has screwed things up but I have no idea how to sort this out.
Budge
Hi, I did this and now I have the correct resolution on my own log in so very many thanks for that. I would never have got there on my own.
Out of interest I went back and looked at the Display and Monitor settings and these were still not correct with only screen locker showing. This setting was correct for the new user so there is still something else to correct on my own login but at least I can see my screen.
Many thanks.
A good way to thank would be to click on sauerland’s add to reputation asterisk. 
Weird… I’ve not seen that one before. As far as I know all users share the same kcm (system settings) modules, so why those options aren’t present for one user I really don’t know :\ …
That may be worth a bug report at https://bugs.kde.org/ - even if it’s not a bug per se the developers over at kde may be able to point you in the right direction.
Well I just checked again and the system settings are not the same and only my new user is correct. The damaged system still has screen locker window only.
When I deleted
~/.local/share/kscreen/
as suggested by sauerland there had been two entries. I deleted both and a new entry was replaced by the system.
Could I just reinstall the kcm settings module and have it rebuild?
Will try the bug submission but I usually get lost in the tech.
Many thanks for all your support.
I don’t think re-installing the system settings module will help, as I said that’s shared by all users. (Although if you want to give it a go you’ll find it in yast’s software manager under the name “systemsettings5”)
Just to be sure myself (your mention of the screen locker window is rather confusing me) could you please
When logged in as the user that exhibits the problem, go to:
System Settings -> Display and Monitors
Capture a screen shot of the whole system settings window, upload to http://paste.opensuse.org/ and provide the link.
Does that particular user date from pre plasma5 days, i.e kde4.
The Screen Lock settings are below “Desktop Behaviour” (not “Display and Monitor”)
http://paste.opensuse.org/view/raw/d82fab82
… however, that was the location on kde4.
Something else to try…
Again logged in as the user that exhibits the problem. Start “systemsettings5” from konsole and see if that’s correct.
Hi all and thanks for the previous help. I am back here again just to report that the same problem had returned. Once I was able identify that I had the same problem I went to this thread I was able to delete the file:-
~/.local/share/kscreen/
Which sorted it for me.
I have still not found underlying fault but I am getting more KDE issues than ever. Constant Baloo crash, a KPG error which came from nowhere and other niggles.
I have always updated from previous versions one step at a time and see that although I am running on KDE 5 my local directory still has KDE 4 stuff in it.
Is there a cleaning program I should use to remove superseded stuff in my machine?
Budge