Re: IPX framebuffer refresh rates

That makes sense.  A lot of lcd's have fixed refresh rates and 60 hz sounds
about right for that.

On Sat, Aug 13, 2011 at 7:09 PM, Alex Carver <[email protected]> wrote:

> That's what's interesting because my LCD does not like the Sun refresh
> rates at all.  I get a warning on the LCD screen stating the frequency is
> out of range.  Seems my screen is locked at 60 Hz.
>
>
> --- On Sat, 8/13/11, Mouse <[email protected]> wrote:
>
> > From: Mouse <[email protected]>
> > Subject: Re: [Suns-at-Home] IPX framebuffer refresh rates
> > To: [email protected]
> > Date: Saturday, August 13, 2011, 10:18 AM
> > > Does anyone know how (or if it's
> > possible) to alter the FB refresh
> > > rates such that a standard VGA LCD will work?
> > I've got a regular CRT
> > > but it's slowly dying and I'd like to use my desktop
> > LCDs in its
> > > place.
> >
> > My experience is limited, but, in my experience,
> > flatscreens will sync
> > to an unmodified Sun video signal.  Most of them will
> > scale the
> > 1152x900 up to whatever their native resolution is, and the
> > result
> > usually looks pretty horrible, but it's plenty good enough
> > for text
> > console use.
> >
> > Some flatscreens can be told to _not_ scale up, in which
> > case you get
> > the display with a (usually black) border around it.
> > But those appear
> > to be rare these days; of my own flatscreens (I have about
> > six), for
> > example, _one_ is capable of this (two of about 12 if you
> > include
> > laptop screens).
> >
> > Many cgsixes can be told to run at alternative resolutions
> > by setting
> > output-device in the OBP to something like
> > "screen:r1024x768x66".
> > Whether this is possible, and the full list of resolutions
> > available if
> > it is, depends on the cgsix and possibly other things (OBP
> > version?).
> > Use the OBP cd command to get to the device (on an IPX it's
> > typically
> > something like /sbus/cgsix@3,0) and then use "words"; if
> > you see words
> > like those in the list, it's worth trying.  In some
> > cases it's even
> > possible to manually construct a resolution-setting word to
> > get a mode
> > that's not in the framebuffer's built-in list; I did this
> > with a cg14
> > back in 2008 - you can find my report on that experience
> > at
> > http://mail-index.netbsd.org/port-sparc/2008/08/08/msg000133.html.
> > (Sorry, I don't know of any non-Webified archive of the
> > list.)
> >
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-- 
Ronald Cotoni
Systems Engineer

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