Re: IPX framebuffer refresh rates

I'm hoping to get a return email from Avocent with good news.  I happen to have one of the KVM converters from Cybex (now Avocent now someone else) that would convert Sun resolutions and timings to VGA as well as keyboard and mouse.  Problem is I've lost the manual for it so now I don't know what the DIP switches and jumper settings do.

At the moment I'm just trying to get NetBSD up and running.  I happen to have a CRT but it's on its last legs.

--- On Sun, 8/14/11, Alan Perry <[email protected]> wrote:

From: Alan Perry <[email protected]>
Subject: Re: [Suns-at-Home] IPX framebuffer refresh rates
To: [email protected]
Date: Sunday, August 14, 2011, 12:02 AM


  

    
  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]>
        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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