Re: atyfb expert needed

On Thu, 12 Feb 2004, Benjamin Herrenschmidt wrote:

The current driver in James tree (with generic lcd support) breaks
the display on the LT-G chip of the powerbook wallstreet. I don't
have time at the moment to dig into every change (there's a lot).

The "effect" is that the screen appears to be cut in vertical bands,
each of them displaying a slightly offseted version of what should be
there with some noise near the right edge.

If that symptom rings any bell about what registers can be wrong,
that would help me a lot figuring out what's up.

Sounds like a problem with DSP_CONFIG and DSP_ON_OFF.

Check aty_dsp_gt(), either the value of fifo_size or the dsp_* values.

BTW, according to Daniël Mantione the DSP calculations in atyfb have always
been wrong (but apparently worked on most machines due to sheer luck ;-), so
you may want to compare with aty_dsp_gt() in current 2.4.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds


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