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I have a Dell Inspiron 1501 and I'm trying to use f.lux with ubuntu, but when I start it I get Sorry, we only support 24/32-bit displays right now. How can I change my display to 24 or 32 bit? I'd appreciate any help.

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Try putting DefaultDepth 24 under Section Device in /etc/X11/xorg.conf.

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This is all I have in /etc/X11/ app-defaults rgb.txt xorg.conf.failsafe Xsession.options cursors X Xresources XvMCConfig default-display-manager xinit Xsession Xwrapper.config fonts xkb Xsession.d – James May 18 '10 at 18:25
    
@officespace Try copying xorg.conf.failsafe to xorg.conf, restart X server and check what happens – Mr Shunz May 19 '10 at 8:08

Try redshift, it doesn't need any particular display depth.

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