Re: IPX framebuffer refresh rates

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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