[nzlug] Screen resolution

[Simon Bridge]

On Fri, 2007-12-21 at 21:53 +1300, Steve Holdoway wrote:
> Get the horiz and vert refresh rates from the manual/website/google, modify the 2 relevant lines, and then remove most of the rest of the monitor section, leaving... ( this is worrying, as there was no modeline definition for a 1680x1050 monitor! )
> 
> Section "Monitor"
>          Identifier      "Failsafe Monitor"
>          Vendorname      "Generic LCD Display"
>          Modelname       "LCD Panel 1680x1050"
>          Horizsync       31.5 - 65.5
>          Vertrefresh     56.0 - 65.0
> EndSection
> 

I heard that horizsync and vertrefresh are irrelevant to LCD monitors.
There's supposed to be a latency time based on how long it takes for a
pixel to change (2-50ms) but LCD screens do not "scan" the way CRTs do,
drawing each line of pixels in order. So the xorg.conf entries are sort
of place-holders and don't do anything.

The only way I can see this mattering is if xorg waits to update the
screen... though, for digital images, things like "frames" don't seem to
mean anything much when it comes to the display process. So what happens
if these entries are left empty?

Don't recall if it is different between active and passive matrix -
don't see why it should be.

Comment?