Cannot change resolution on old iBook G3 equipped with ATI Rage M3

Riccardo Murri riccardo.murri at
Sat Dec 1 01:09:48 PST 2007

On Nov 30, 2007 8:23 PM, Alex Deucher <alexdeucher at> wrote:
> On Nov 30, 2007 6:13 AM, Riccardo Murri <riccardo.murri at> wrote:
> > [deletia]
> >
> > However, when I try to change the resolution with to 800x600 (`xrandr
> > -s1`) I get a corrupted display:
> >   - the lower-res desktop is visible in the upper left portion of the
> >     display;
> >   - a black band is displayed on the right portion of the LCD panel;
> >   - the upper portion of the visible screen is replicated down left on
> >     the LCD panel;
> >   - between the upper portion and the lower portion of the panel, a
> >     band of random junk is displayed, as wide as the LCD panel.
> >
> > At 640x400, things are even worse.
> >
> > I have tried every suggestion I could Googling (setting depth to
> > 16bpp, fiddling with options in xorg.conf, etc.), to no extent.
> > The Apple specs for the iBook say that the LCD is 1024x768 but that
> > the video card would scale lower-res images to the panel size.
> > Indeed, it works on some other (more recent) iBook that I have.
> It might be a problem with the r128 fbdev driver.  try setting:
> Option          "UseFBDev"              "false"
> That will use the use the native driver code to change modes and will
> also allow you to use zaphod style dualhead if you want.

Thank you for the siggestion, but it didn't work.

Riccardo Murri, via Galeazzo Alessi 61, 00176 Roma

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