Re: IPX framebuffer refresh rates

I have had no luck getting any of my LCDs to work with any of my 
lunchbox systems.  But I haven't tried every display with every system.  
I always use them with the serial console.

alan

On 8/13/11 8:39 PM, Ronald Cotoni wrote:
> 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] 
> <mailto:[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]
>     <mailto:[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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