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How can I switch the color depth of my video card without reboot the machine. For I have an application which can only run properly under 16bit color depth but my video card is configured to 24bit color. What should I do?
Thanks. I have seen others use a command like "startx -- :1 -depth 16 -xf86config XF86Config-4.16bpp" to change their color depth and switch to the 24bit color by press the Ctrl-Alt-F7. Their system is redhat 7.3 and mine is redhat 9.0. Do you know how they can do that? Can I use this method and how?
What you have observed is someone starting a second X session with a customized configuration file (specified with the -xf86config XF86Config-4.16bpp argument) to run at 16bpp. They are able to then switch back to their original (24bpp) X session with the Ctrl-Alt-F7 keystroke sequence.
They can switch to the 16bpp session with a Ctrl-Alt-F8 keystroke sequence, similarly to the way they switched to the non-X terminal session they used to invoke the second X session with a Ctrl-Alt-F1 keystroke sequence.