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 <[email protected]>: > On Dienstag, 30. Oktober 2012 16:14:32 CEST, Johan Mazel wrote: >> 2012/10/31 Alex Deucher <[email protected]>: >>> 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 _______________________________________________ [email protected]: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: [email protected]
