I finally found some documentation :
http://i.dell.com/sites/content/shared-content/data-sheets/en/Documents/optiplex-990-tech-guidebook-final-1-4.pdf.
In a short word, for this particular Dell model, Optiplex 990, HD6350
is stuck at 1920x1200. I need to upgrade to HD6450 if I want
2560x1600.
This is also the case for Optiplex 960 with an AMD HD 3450 (cf
https://www.dell.com/downloads/global/products/optix/en/desktop-optiplex-960-technical-guidebook-en.pdf).
This means that the guys building graphic card for Dell are
particularly careless/cheap. :/
I'll check the xrandr trick.
I already tried something similar: generating a modeline through
cvt/gft, add it and use xrandr to use it. However, the image was
completely messed up.
Johan
2012/10/31 Thomas Lübking thomas.luebk...@gmail.com:
On Dienstag, 30. Oktober 2012 16:14:32 CEST, Johan Mazel wrote:
2012/10/31 Alex Deucher alexdeuc...@gmail.com:
On Tue, Oct 30, 2012 at 6:35 AM, Johan Mazel
Theoretically, the HD5450 is able to display the screen's native
resolution (2560x1600) according to
http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-3000/hd-3400/Pages/ati-radeon-hd-3400-specifications.aspx
provided that a dual-link DVI cable is used, which is the case.
Unfortunately, the biggest available resolution is 1600x1200 on Debian
Testing and 1920x1200 for Ubuntu 12.10.
While the chip is cable of dual link, dual link is only available if
the oem wired up a dual link DVI connector on your card. If the oem
used a single link DVI connector, you will be limited to single link
DVI. I suspect that is what's happening.
Alex
Are you sure that this would explain both problems (I mean with Debian
and Ubuntu) ?
One hypothesis might be that the package used by Ubuntu 12.10 fixes
the software problem present in Debian's package version while the
hardware problems remains...
Single link is limited to 1600x1200 unless the entire chain supports reduced
blanking, what bumps the limit to 1920x1200 (both at 60Hz)
Support for latter is probably not correctly detected on the Debian system.
You can use xrandr --newmode and --addmode and see what happens if you try to
forcefully select 2560×1600 (but i'd add a sleep 10; xrandr -s 1920x1200
because the screen will likely turn off - or the DVI link burns ;-)
Also ensure the cable to actually support DL and is not broken (test on other
system)
Notice that DVI-D does *not* mean Dual-Link, but Digital. You need the
pins in the center:
http://upload.wikimedia.org/wikipedia/commons/thumb/f/fb/DVI_Connector_Types.svg/1000px-DVI_Connector_Types.svg.png
Cheers,
Thomas
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