VNC Viewer for Macintosh (flicker)

[Jonathan Morton]

>>I've tried using the standard VNC viewer to test my server implementation
>>but found it unusable for the following reason:
>>
>>The bottom portion (up to 2/3rds) of the screen repeatedly updated, causing
>>severe flicker.  On the Quadra 840av I was using, this slowed it down a lot
>>too.  I didn't see any extra data being requested from the network as a
>>result of these updates.
>>
>>I'd like to ask if other people have experienced this problem, which does
>>not occur in the 'alternative' viewer by Purple Shark.
>>
>>Along with my efforts on the VNC Server for Macintosh, I'd like to fix this
>>bug in the viewer, and add one or two important features such as
>>double-buffering.  Also, I think i've spotted one possible speed-up for
>>HexTile viewing which would be beneficial when double-buffering was *not*
>>available.
>>
>>--------------------------------------------------------------
>>from:     Jonathan "Chromatix" Morton
>>mail:     chromi "at" cyberspace.org  (not for attachments)
>>uni-mail: j.d.morton "at" lancaster.ac.uk


>This may be due to cabling etc.  I also have a Q840av and a year or so ago
>I put in a switch box to enable my NEC 5FG to view both my Linux box and
>the Mac.
>
>After the insertion of the switch box, whenever I would view an email
>message with a line of asterisks, the display would go crazy and black out.
>I could recover by (blindly) clicking on another email message which would
>'cover' the line of asterisks.  (Determining that the problem was caused by
>the asterisks took a bit of trial and error).
>
>Removing the switch box also cured the problem.
>
>There must be some circuitry resonance which is causing my problem and it
>might be the same for you.
>
>Because of my switch box, I don't use VNC very much.  I will give it a try
>and report back.
>
>BobG


Nope, it's not circuitry.  This is happening at the digital level - the
window is being blanked white and repainted.  MacVNC (alternative viewer by
Purple Shark) uses a very similar window, but doesn't have this problem.

I wouldn't bother with switchboxes if they caused *that* much problem, if i
were you - in fact i don't have a switchbox myself, just a pair of monitors
on separate video cards.

--------------------------------------------------------------
from:     Jonathan "Chromatix" Morton
mail:     chromi "at" cyberspace.org  (not for attachments)
uni-mail: j.d.morton "at" lancaster.ac.uk

The key to knowledge is not to rely on people to teach you it.



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