Re: machfb (sort of) working on Mach64 GX

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

On Thu, 28 Apr 2011, Michael wrote:

> There is one way to find out if the mode setting code is the culprit ( it 
> probably is ).
> In mach4_attach() look for this:
> if (setmode)
>         mach64_modeswitch(sc, sc->sc_my_mode);
>
> and comment it out.

I'll do that next.  In the meantime:

> So, someone with an iMac please try the above, build a kernel with options 
> MACHFB_DEBUG and send me the kernel output ( it should contain a dump of the 
> monitor's EDID block ). With that I should be able to tell wether the logic 
> that picks a video mode is faulty ( it probably is, since the iMac's CRTs 
> require a fixed horizontal frequency which is rather unusual ).

Done.  Actually, MACHFB_DEBUG and DIAGNOSTIC set, but only in machfb.c
itself.

The resulting dmesg can be found at:

  http://bobdbob.com/~jdbaker/nbsd-debug/dmesg-machfb-debug-GENERIC.txt

I've inserted some /* comments about what the screen is doing */ at
a few key points.

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