Re: unusual display problem

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On Fri, 3 Apr 2020 08:51:27 +1100
fedora@xxxxxxxxxxxxxx wrote:

No definitive answers, just some questions to point you to
troubleshooting.

> [the images will be posted as replies due to size limits]
> 
> For a while now I have the following problem. After boot and login
> things look OK, however moving any window shows terrible artifacts.

Desktop?  Desktop manager?  What if you try a different desktop, or
desktop manager?

> 20200402_100028.jpg
> 	I do a reverse search: ^Rls -l
> At this point the whole line is filled with a repeated quote
> character. Doing other things will repeat a substring of what the
> text holds. Hitting 'end' key will show the full text followed by the
> quotes. Very difficult to work when parts of the text disappear or
> get mangled.

Sounds like the input is being altered.  Is it possible the keyboard is
having issues?  Could you try unplugging it and re-plugging it?  How
about memory, power supply?  Heat?  Is there dust buildup?

What happens in virtual consoles?  Say Ctrl-Alt-F2.  Are there problems
with text changes or color?

How about with a different terminal in X?  Problem still there?


> 20200402_094034.jpg
> 	Moving on, I grab the window and move it a bit. The whole
> window is filled with a pattern, here is is just a color pattern.

Again, this seems like the data is being mis-read, and color
characteristics are being altered unintentionally and randomly.
> 
> If the window gets repainted it looks OK until I move it again. The
> only way I found so far to fix it is to restart X, so logout then
> login, not nice.  

Does it stay fixed after the restart of X?  Hardware errors should
recur, while software errors will be fixed by reloading.
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