I have an old P3 laptop with an 800x600 screen on which I've installed WattOS 7.5. I know it is now on 10 but 7.5 is the latest one that will fit on a CD. The later ones will only fit on DVD. This is an old machine - it only has a CD reader, it will not boot off USB and it doesn't like microWatt (which still fits on a CD). There is something wrong with the microWatt drivers - the entire screen appears as a 0.25" bar. Anyway, it has WattOS 7.5.
My login screen is very reddish. If I run it from my desktop it is greenish - which is the correct colour. Also, for some reason, the system thinks it has a 1024x768 screen. After logging in, all the colours are OK.
The obvious answer would have been to ask the WattOS site but it is a chicken and egg situation. It wants me to sign in and in order to sign in, I need an invite key. I've got no idea what one of those is. To find out, I'd have to login and ask but I can't login because I haven't got an invite key.
Before committing the settings in stone, I decided to try them out. First, I set the screen size
xrandr -s 800x600
The screen size changes and I can now see the taskbar but the brightness has also changed to half. When I type xrandr -q, I get
xrandr: Failed to get size of gamma for output default Followed by the resolutions
I suspect it is assuming I have 24 or 32-bit colour but this is an old system so at most 16-bit colour, which possibly explains why it has all gone dim and why my login screen seems to have lost its blue/green component.
- I must be looking up the wrong keywords - I can't find how to set the number of colours to 65536 or to tell the system that it has 16-bit colour. All the hits I am getting are how to set console window colours.
- Another lot of searches says gedit /etc/X11/xorg.conf This file doesn't exist on my system. Again, I think I'm looking up the wrong keywords. Almost all the hits tell me where it is, none of them tell me what has replaced it.
- How do I make these settings permanent so that my login screen appears in the correct colour and the system knows what size my screen is.
Edit I've found https://ubuntuforums.org/showthread.php?t=1493835 Apparently xorg.conf will be used if created. I'll give that a try later today. The laptop can only stray from a power supply for 5 minutes: after that it shuts down.
Edit This question is now purely academic - the machine just died.