+----[ Hans Ekbrand <[EMAIL PROTECTED]> (31.Jan.2005 14:53):
|
| > The VRAM of this Macintosh is 1MB (expandable to 4MB I
| > believe). However what I fail to understand is why the Mac
| > OS is able to get a higher color depth than debian/linux on
| > the same hardware.
|
| I have similar problems, but I do have understanding of the issues at
| hand and I think I know why the following failed for you.
Hans,
thanks for the answer.
| > debian:~# fbset -fb /dev/fb0 -depth 16 "832x624-75"
|
| The problem is the speed of the graphic chip, not lack of RAM. I have
| a Macintosh Performa 5400 with the valkyrie graphic chip and if it the
| same as yours, MacOS cannot give 16 bpp at that mode, it only
| handles 16 bpp at [EMAIL PROTECTED]
The graphic chip of the 7200 is the platinum, and my MacOS does give me 16 bpp
at [EMAIL PROTECTED] This is the list of available resolutions and frequencies I
see in Mac OS:
[EMAIL PROTECTED] (256 grays, 256 colors, Thousands of Colors)
[EMAIL PROTECTED] (256 grays, 256 colors, Thousands of Colors)
[EMAIL PROTECTED] (256 grays, 256 colors)
[EMAIL PROTECTED] (256 grays, 256 colors)
This is with a Philips 107E5 monitor (17"), connected
through a NEC Multisync cable adapter.
|
| :~# fbset -i
|
| mode "800x600-60"
| # D: 40.000 MHz, H: 37.879 kHz, V: 60.317 Hz
| geometry 800 600 800 600 16
| timings 25000 72 56 23 1 128 4
| hsync high
| vsync high
| rgba 5/10,5/5,5/0,0/0
| endmode
|
| Frame buffer device information:
| Name : valkyrie
| Address : 0xf1001000
| Size : 960000
| Type : PACKED PIXELS
| Visual : DIRECTCOLOR
| XPanStep : 0
| YPanStep : 0
| YWrapStep : 0
| LineLength : 1600
| MMIO Address: 0xf130a000
| MMIO Size : 64
| Accelerator : No
This is what I get from 'fbset -i'
mode "832x624-75"
# D: 57.597 MHz, H: 49.997 kHz, V: 74.959 Hz
geometry 832 624 832 624 8
timings 17362 208 48 39 1 64 3
rgba 8/0,8/0,8/0,0/0
endmode
Frame buffer device information:
Name : platinum
Address : 0xf1000090
Size : 1048576
Type : PACKED PIXELS
Visual : PSEUDOCOLOR
XPanStep : 0
YPanStep : 0
YWrapStep : 0
LineLength : 864
MMIO Address: 0xf8000000
MMIO Size : 4096
Accelerator : No
|
| It *might* be possible to get [EMAIL PROTECTED] but at a lower refresh
| rate.
|
+----]
Mmm ... yes, but how do I get the correct values for a
different refresh rate so that I can put them between in
/etc/fbset.modes. AFAIK there was no other entry for
832x624. The alternatives to check color at 16 bpp are
640x480 or 800x600.
Thanks for your answer,
Fernan
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