Re: Frame buffer device thinkings...

Olaf Titz (olaf@bigred.inka.de)
Thu, 17 Sep 1998 10:43:14 +0200

> > get black-on-red instead of the desired red-on-white.) My problem is
> > that the palette is reset to the default on every console switch. I'd
> > like to have it persist across switches, but I don't know how
> > impossible that would be. Comments?
> ioctl FBIOPUTCMAP on /dev/fb0 (if you use a frame buffer device
> console). More info in <linux/fb.h>.

That's exactly what I'm using, straight from the manual if there was
one ;-) It does work, but the next console switch resets the colors to
the default. I don't know if the cause is in the generic framebuffer
or matroxfb. I've previously attempted to do the swap in the kernel
at startup, i.e. at the end of fbcon_setup(), but that didn't work at
all (that was 2.1.109 with vesafb then, and 2.1.121 with matroxfb now).
It flashed the screen white and then immediately turned it black
again. Apparently there is some (hardwired?) reset in the console
switcher.

olaf

#text/plain [Program to swap black and white on frame buffer] /home/olaf/mysrc/fbcmapinvert.c

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