[ltp] DVI throughput with port replicators/docking stations

[André Wyrwa]

I don't believe that a FireGL or FireGL T2 wouldn't be able to drive
1600x1200 through DVI when it's able to do 2048x15xx through VGA.

Since it seems to be a driver problem according to Aarons tests (which
matches the impression i got from the other sources), i guess that IBM
did disable higher resolutions than SXGA because they knew about the
problem with the pixels.

Or then there might be, as you say, some probs with the electrical
characteristics of the port replicator, which would be a pity.

However, since the problem doesn't occur with recent X and seems to be
solvable in win, i'm satisfied and will buy one of the T4Xp thingies as
soon as i get a good catch.
To be sure I'll keep my PCI card at hand. ;-)

Thanks a lot, expecially to Aaron for messing with your setup.
André.


On Die, 2004-06-08 at 18:19, Satish Balay wrote:
> I would think the DVI resolution that thinkpads can drive primarily
> depend on the graphics card - and not the port replicatior (although
> there could be some electrical charecteristics of the port-replicator
> than can prevent this resolution)
> 
> And most video cards have a different resolution specification for DVI
> - and non DVI outputs - and most folks (including IBM) list only
> non-DVI resolution in the specs.
> 
> <speculation>
> Since the newer T42p models come with a 15in 1600x1200 LCD - I would
> guess the graphics cards in them can drive external LCD displays also
> at the same resolution.
> <end>
> 
> Satish
> 
> On Tue, 8 Jun 2004, Aaron Mulder wrote:
> 
> > 	It's been a while since I tried this, so I hooked it up again
> > today.  I'm using SuSE 9.1 and the radeon driver included in XFree86, and
> > I'm not getting any of the pixel problems.  Perhaps then it is a driver
> > issue (I'm sure when I last tried I was using Red Hat 9 or so).  This is
> > on a T40p -- The T30 still has Red Hat 9 on it and still has the problem,
> > so it's not strictly OS-related.
> >
> > 	I also tried booting to Windows, using a pretty recent ATI driver
> > from IBM.  It showed the max resolution of the panel as 1600x1200, but
> > wouldn't drive it higher than 1280x1024.  If I fussed I could get it to
> > let me set the resolution to 1600x1200, but then it panned.  I haven't
> > tried a driver directly from ATI to see whether it works at all at
> > 1600x1200.
> >
> > Aaron
> >
> > On Tue, 8 Jun 2004, Andr? Wyrwa wrote:
> >>> The limitation of 1280x1024 is purely a IBM ATI Windows driver problem.
> >>> The "IBM" ATI windows driver is multiple revisions out of date from the
> >>> latest official ATI driver.
> >>
> >> This suggests that the problem doesn't exist in Linux at all (as opposed
> >> to what Aaron wrote)? What about the green/red pixels?
> >>
> >>> If you are stuck with Windows, the solution is to download the latest
> >>> ATI Catalyst drivers, and then use this tool:
> >>>
> >>> http://www.driverheaven.net/patje/
> >>
> >> This looks good, for actually i am stuck with win.
> >> Do these catalyst drivers also solve the green/red pixel problem?
> >>
> >> Thx,
> >> André.
> >>
> >>
> >> --
> >> The linux-thinkpad mailing list home page is at:
> >> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
> >>
> > --
> > The linux-thinkpad mailing list home page is at:
> > http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
> >