On Sun, Oct 11, 2009 at 9:15 AM, Csillag Kristof <[email protected]> wrote: > Dear all, > > Please help me assess the general situation. I am trying to get a > multimonitor/multicard setup work with ati cards and the free radeon driver. > > Here is my current understanting of how things go. Those with the proper > knowledge/authority, please confirm/correct/deny the following statements! > > 1. Monitors on the same GPU can be united into a big desktop using > randr. Unfortunately, most GPU-s can only drive at most 2 monitors. > > There are cards like the FireMV 2400, which have 4 outputs, but they > are internally two GPUs, so they do not count. > > Q: are there any radeon cards with more than two digital outputs > connected to the same GPU? > > 2. To unite monitors connected to different GPUs (on he X server level), > one needs Xinerama. > > 3. Uniting a monitor from one GPU and an other monitor from an other GPU > works fine with Xinerama. > > 4. If one wants to use Xinerama to unite monitors from different GPUs, > and there is a GPUs which has more that one monitors connected to then, > it is not allowed to use randr to unite these monitors (before uniting > them with the rest, on the different GPUs), because randr and Xinerama > do not mix. Therefore, instead of the normal (randr) mode, one needs to > go with Zaphod-mode. > > 5. Zaphod more rarely gets any testing, and tends to be broken. (Right > now it seems to be.)
Mostly true up until there, zaphod on radeon should be working fine, under KMS and under non-KMS, I test it at least once per Fedora release cycle. However there are various issues with older X's and two cards such as secondary posting breakage, hangs on X server exit with two cards, these should all be solved in a KMS environment, the only remainging thing that zaphod doesn't do at the moment is let you configure which outputs go where, which depending on the BIOS output ordering can be a bit of a pain, esp if TV is detected second. Dave. _______________________________________________ xorg mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/xorg
