DVI output with ATI RV280 series graphics cards is broken in xorg. This is caused by a [[https://bugs.freedesktop.org/show_bug.cgi?id=2859|bug in the xorg ati/radeon driver]]. A solution to the problem is provided by this instruction (requires recompiling the driver). == Prerequisites == '''This HOWTO was written for Edgy. The problem still exists in Feisty, however the name of the package has changed. Please change every instance of "xserver-xorg-''driver''-ati" with "xserver-xorg-''video''-ati" for this to work on Feisty.''' To recompile the driver we need some packages installed on our system. {{{ $ sudo apt-get install build-essential fakeroot $ sudo apt-get build-dep xserver-xorg-driver-ati }}} == Instruction == In a new empty directory (our build directory) run: {{{ $ apt-get source xserver-xorg-driver-ati }}} This downloads three files and unpacks the sources into the directory xserver-xorg-driver-ati-version. In this directory is the file src/radeon_bios.c, that we need to edit. Towards the end of this file is a comment saying: {{{ /* revision 4 has some problem as it appears in RV280, comment it off for now, use default instead */ }}} And after this comment follows a code block that has been commented out. We need to re-enable this code by removing the commenting-out. In my case deleting lines 574 and 561 did the job. Now we can build the driver by running: {{{ $ dpkg-buildpackage -rfakeroot -uc -b }}} from within the directory that was created for the package after downloading. To install it run: {{{ sudo dpkg -i xserver-xorg-driver-ati_6.5.7.3-0ubuntu7_i386.deb }}} from within our build directory.