On Wed, 22 Nov 2000, Zack Weinberg wrote:
> > > I've just upgraded to XFree86 4.0.1 (thanks for the packages,
> > > Branden!) and have encountered a bug in video mode detection with the
> > > Mach64 drivers.
> > > (--) ATI(0): Virtual size is 1152x864 (pitch 1152)
> > > (**) ATI(0): Default mode "1024x768": 94.5 MHz, 68.7 kHz, 85.0 Hz
> > > (**) ATI(0): Default mode "1152x864": 108.0 MHz, 67.5 kHz, 75.0 Hz
> > > (--) ATI(0): Display dimensions: (32, 24) cm
> > > (--) ATI(0): DPI set to (91, 91)
> > > But in that mode the right hand two-thirds of the screen is mangled.
> > > It appears as if the image has been duplicated, shifted right about a
> > > hundred pixels, distorted, and overlaid on the original. With massive
> > > flicker. xvidtune cannot help.
> > > If I reduce the depth to 16, then both 3.3.6 and 4.0.1 accept 1152x864
> > > and display it correctly.
> > What about -depth 24 -fbbpp 24? If that works fine, then fbbpp 32 (the
> > default) at 108MHz is simply asking too much out of your video memory.
> Yes, -fbbpp 24 displays correctly. Is it feasible to make the driver
> detect this automatically?
Not entirely. I have no reliable means of detecting the video memory
width.
Marc.
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