AFAIK, the X "mach64" driver in XF 4.* doesn't care about UseFBDev.
Marc Aurele La France (maintainer of this driver) is basically allergic
to kernel fbdev support.
> What doesn't work is changing VTs from X to a
> text console. If I press ctrl-alt-F1, for instance, the colormap
> changes but I don't see anything get redrawn. The screen looks just
> like what I had in X but with the altered colormap. If I then press
> alt-F7, it switches back to X and X redraws the screen properly and
> restores its colormap.
I don't know if happened with earlier fbdev versions for you, but one
possibility is that X reconfigures the display base, and possibly more
bits of the card's internal memory map. Either fbdev should restore
that, or adapt to what X set. On R128's and radeon's, this is things
like DISPLAY_BASE_ADDR.
> The patch below also takes out the CONFIG_NVRAM stuff since it doesn't
> work and I don't believe anyone has ever used it.
Yup, it's some wacky old pmac stuff that should be killed.
> I have also tried aty128fb with some local patches to get it to
> compile for my G4 powerbook. It also doesn't draw the penguin, and it
> oopses when X starts, for some reason.
Hrm... I'll have to test radeonfb... It worked yesteday in console (I
don't remember about the penguin) but I didn't try X.
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