[Solved] 800x600 60Hz mode

[ric.rug]

I am trying to add a resolution of 800x600

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xrandr --newmode "800x600_60.00"   38.25  800 832 912 1024  600 603 607 624 -hsync +vsync
xrandr --addmode default "800x600_60.00"
xrandr --output default --mode "800x600_60.00"


After that last command I receive:

xrandr: Configure crtc 0 failed

Any idea about how to use that resolution?

Thx!

Update 1: change_display.sh returns "Unknown boot device". (solved)
Update 2: I can see the video output while booting (800x600 60Hz).
Update 3: How can I apply the same configuration used at boot time? (solved adding params to bootargs)