On Tue, Oct 30, 2012 at 6:35 AM, Johan Mazel <johan.ma...@gmail.com> wrote: > Hi > I am trying to use a Dell U3011 (30 inches IPS screen) on a Dell > Optiplex 990 with an AMD HD 5450/6350. > I am using Debian Testing and Ubuntu 12.10 with Xorg's ATI driver. > The respective xserver-xorg-video-radeon package versions for these > two OSes are: 1:6.14.4-5 and 1.6.99.99~git20120913.8637f772-0ubuntu1. > > 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. > > I think there is a discrepancy between what Xorg probes through the > graphic card as the biggest resolution available (1600x1200, starting > line 438 in Xorg.0.log_debian_xorg) and what is actually announced by > the monitor (2560x1600, eg.: line 587 (and further) in > Xorg.0.log_debian_xorg). > This discrepancy is also present in Ubuntu's Xorg log files. > > I am guessing that Ubuntu uses a slightly newer version of the driver > and therefore handle slightly better the resolution. > However, I have no idea regarding the cause of this discrepancy.
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 _______________________________________________ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: arch...@mail-archive.com
