In Slack you have to edit
/etc/X11/XF86Config
look for the 'screen' section and for the default depth you have chosen
put the resolution you want first on the line in qoutes> such as
this is how mine looks >
Section "Screen"
Identifier "Screen 1"
Device "nvidia"
Monitor "nec"
DefaultDepth 24
Subsection "Display"
Depth 8
Modes "640x480" "800x600" "1024x768" "1280x1024"
ViewPort 0 0
EndSubsection
Subsection "Display"
Depth 16
Modes "640x480" "800x600" "1024x768" "1280x1024"
ViewPort 0 0
EndSubsection
Subsection "Display"
Depth 24
Modes "1024x768"
ViewPort 0 0
EndSubsection
EndSection
my default depth is 24 so in the '24 section' I have 1024x768 as my resolution.
I think in Redhat you edit the XF86Config-4 file instead
Good Luck
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