It is likely that the connector was only designed for 1280x1024 - which
requires a smaller bandwidth. If the person with this problem is into
hacking hardware he might try finding out which port replicator connector
pins are used for DVI and whether the problem is interconnect within port
replicator and/or interconnect within the notebook and/or noise from
something else.
I would also suggest trying to disconnect any other devices that might use
port replicator connectors - especially USB ones.
best
Vladimir Dergachev
On Tue, 27 May 2003, Michael B Allen wrote:
> Does anyone have any insight into this problem? I can compile from
> source if any has patches they want me to try out. The chip is the Radeon
> Mobility 7000 IGP:
>
> http://www.ati.com/technology/hardware/mobilityradeon7000IGP/index.html
>
> Thanks,
> Mike
>
> --original message to XFree86 list--
> On Sat, 24 May 2003, Michael B Allen wrote:
>
> I'm trying to get the external dvi-d output on my IBM T30 via port
> replicator to work with my 1600x1200 flat panel. I tried X 4.2 but there
> was a lot of garbage on the screen. So I upgraded to X 4.3 and it's
> better but still there are red and green dots in gradient areas. I tried
> to take a screenshot but it was clean. IBM's website has this to say:
>
> TP A30, A31, T30 - Maximum Digital Video (DVI) Resolution is 1280 x
> 1024 at 60 Hz
>
> Symptom
> When attaching a Digital Flat Panel Display to the Digital Video
> Interactive (DVI) Connector on the back of the Dock or Port Replicator,
> running 1600 x 1200 resolution, video noise appears on the display.
>
> Affected configurations
> ThinkPad A30, A30p, A31, A31p and T30 computer systems external DVI
> Connector.
>
> Solution
> Use 1280 x 1024 or lower resolution with the DVI Display.
>
> Additional information
> DVI resolution higher than 1280x1024 is not supported on A30, A31,
> and T30 ThinkPads.
>
> But this doesn't say explicitly that it's a hardware problem. The noise
> isn't that bad. It's very very close but not quite. Any ideas?
>
> Thanks,
> Mike
>
> --
> A program should be written to model the concepts of the task it
> performs rather than the physical world or a process because this
> maximizes the potential for it to be applied to tasks that are
> conceptually similar and, more important, to tasks that have not
> yet been conceived.
>
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