Need help with monitor resolution Dell Optiplex GX620

[Odin Nøsen]

>
> I have a bunch of Dell Optiplex GX620's that I want to use in my lab.
>  They have one video output with a DVI-VGA dongle.  I am using a DVI to VGA
> adapter to connect to my VGA only ACER G185H monitor which has a native
> resolution of 1366x768 running at 60 hz
>
> So...no matter what I try (I've pasted my entry in lts.conf below...and
> I've tried varying options within by commenting things out...etc)  My
> xrandr -q output on the thin-client says that VGA1 is active and for modes
> up to 1024x768 (which looks silly on a 16.9 monitor of this size)  It also
> says DVI1 is disconnected.  I'm running Edubuntu 12.04....and I'd really
> like to solve this...it's about the only thing I have left.  Any ideas?
>

I think you are out of luck... :-(

We've had the same problem with a lot of Optiplexes with only a HDMI-output
and using a HDMI->VGA-dongle. If we use HDMI X always chooses the right
resolutions from the EDID-information. If we use VGA EDID, for some reason,
always collapses to default 1024x768, 800x600 and 640x480. I think this is
because they save some pennies by not connection all the pins in the
VGA-port.

Doing a simple X_MODE_0=1366x768 won't work, because it isn't a mode from
EDID while using the VGA1-port.

I've searched the Internett for a solutions, but the only thing that I find
is making a xorg.conf-file with some kind of default setup with the right
monitor modes. You can use a xconf.conf generated when you use the
DVI-connection as a start.


Odin


>   [00:12:3f:c0:a8:81]
>   HOSTNAME = L11
>   XRANDR_DISABLE=True
>   XRANDR_OUTPUT_0 = "VGA1"
>   XRANDR_OUTPUT_1 = "DVI1 --off"
>   X_MODE_0=1366x768
>   XRANDR_RATE_0 = 60
>
> David Trask
> Technology Director/Teacher
> Vassalboro Community School
> dtrask at vcsvikings.org
> (207) 923-4305
>
>
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