[Linux-fbdev-devel] RE: [linux-fbdev] frame buffer / fixed freq mon question

[Larry M. <lm...@MR...>]

ok, I am basically running right now in 1024x768x16bit... How can I figure
out what the equivalent settings are when transcribing them from X speak to
FB speak?  Any help would be appreciated... Thanks


-Larry Mulder
lr...@ez...

-----Original Message-----
From: Jim Hague [mailto:jim...@ac...]
Sent: Friday, May 18, 2001 4:31 AM
To: Larry Mulder
Cc: Linux Fbdev development list
Subject: RE: [linux-fbdev] frame buffer / fixed freq mon question


On 17-May-2001 Larry Mulder wrote:
> I have X windows (XFree86-3.3.6) setup with a mach64 based video card to
> drive a fixed frequency Sun monitor OEM's by SONY (GDM-1962B),   However,
> you might well know that when connected to a PC, these fixed frequency
> monitors don't understand standard VGA text mode... I am just curious if
it
> would be possible to modify either the atyfb or the vesafb driver in the
> linux kernel to drive this monitor using the fixed freq signals it needs?

I have (nearly) exactly the setup you describe - fixed frequency Sun monitor
driven from a PC. I am using a Permedia card not Mach64, but just because a
Permedia card is what I had. And I am using the frame buffer driver to get a
very loverly console.

I suspect (but don't know for definite) that the vesafb driver won't work,
as
I think it uses only VESA sanctioned modes available from the card, and
Sun's
resolution isn't one of those.

But I would hope that the atyfb driver would allow you to set your own
output
mode, either via boot parameters (if you can with atyfb) or by using fbset
on
boot. Here's my fbset settings (given in X style first for comparison with
your
X settings):

mail:/home/jim# fbset -s -x

Mode "1152x900"
    # D: 92.945 MHz, H: 61.799 kHz, V: 65.954 Hz
    DotClock 92.946
    HTimings 1152 1184 1312 1504
    VTimings 900 902 906 937
    Flags    "-HSync" "-VSync"
EndMode

mail:/home/jim# fbset -s

mode "1152x900-66"
    # D: 92.945 MHz, H: 61.799 kHz, V: 65.954 Hz
    geometry 1152 900 1152 900 16
    timings 10759 192 32 31 2 128 4
    rgba 5/11,6/5,5/0,0/0
endmode

Set your own mode, and you should get a properly working console.

In the case of the Permedia driver, you can only set a precanned mode from
boot
parameters, so I added a 'Sun fixed frequency' mode and rebuilt. (I did once
submit a patch to the driver author to add specifying mode by its
components,
but it never made it).

-- 
Jim Hague - jim...@in... (Work), ji...@be... (Play)
Never trust a computer you can't lift.