On dimanche 7 juin 2020 21:14:20 CEST Gary L. Roach wrote:
> I recently up graded this system to Bullseye and then ran into trouble
> with the lack of Qt4  and had to re-install Buster. The installation
> went fine until kde desktop tried to start. The system froze with the
> following message:
> 
> The current input timing is not supported by the monitor             
> display. Pleas change your input timing to 1920x1200@60Hz or any other
> monitor listed timing as per the monitor specifications.

Is the login/password window showing up ?

Does this message show before or after logging in ?

> I'm using a Dell U2412M monitor on an AMD 64 4 core system. The monitor
> worked fine before and still works fine on another computer. I tried
> both xrandr and compiz in Recovery Mode. In both cases I got "Can't open
> display".

In recovery mode, xorg is not running so xrandr has no X server to connect to.

HTH




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