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Re: XFBdev resolution platinum 7200/90

On   8 Sep, this message from cesagbo@b2b2c.ca echoed through cyberspace:
>> Can you show us your /var/log/XFree86.0.log?
> Yes i can:
> (II) FBDev(0): using default device
> (II) Running in FRAMEBUFFER Mode
> (**) FBDev(0): Depth 8, (--) framebuffer bpp 8
> (==) FBDev(0): Default visual is PseudoColor
> (==) FBDev(0): Using gamma correction (1.0, 1.0, 1.0)
> (II) FBDev(0): Hardware: platinum (vidmem: 1024k)
> (II) FBDev(0): Checking Modes against framebuffer device...
> (II) FBDev(0): mode "800x600" ok

OK, good... so it sees 800x600 somewhere.

> (II) FBDev(0): Checking Modes against monitor...
> (--) FBDev(0): Virtual size is 640x480 (pitch 640)

... but why is it going back to 640x480 now?

> (**) FBDev(0): Built-in mode "current": 30.0 MHz, 34.7 kHz, 66.1 Hz

Mode "current" is how the (console) framebuffer device is configured.
You can try this:

	fbset -a "800x600-75"

on the console before starting X, which should switch the console to

> MacOS display is /platinum
> Total VRAM = 1MB 0001
> Monitor sense value = 0x62b, using video mode 6 and color mode 1.

vmode:6 and cmode:1. That's 640x480 at 16 bpp... Sure your monitor
supports more? What monitor is this? The sense value forces it into
640x480. If it's a multisync monitor on an adaptor, you need to chose a
different setting on the adaptor to select a multisync timing (best) or
the mode you'd like to see (also good).

> I`ve tried "video=platinum:vmode:10,cmode:0"(800x600-60Mhz 8 colors) with no change at all
> i can see in /proc/cmdline the argument but the framebuffer doesn`t react at all. X still use the 640x480-66Mhz default. 

Well, yes, your monitor tells your computer it can only do 640x480. The
computer obeys...

>> >     Can i use a pc ati mach64 in a powermac?  I gess not, because of
>> the pci bus speed diff. (33/45Mhz) and the bios of the card...
>> PCI buses on Macs _always_ run at 33 MHz (or 666 MHz.. but that was
>> oneor two generations later :-) . Your 45 MHz is the CPU bus.
>> Making a Mach64 work in a 7200 can be done. Shouldn't be too hard....
>   What does it mean?  Can i plug the card directly or should i do something else first like flashing the bios?  I`m new to the powermac hardware...

You can plug it in, yes. But you won't see any video output until the
kernel boots. Compile a kernel with atyfb and try it!



Michel Lanners                 |  " Read Philosophy.  Study Art.
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email   mlan@cpu.lu            |
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