State of multi-head with multiple radeon graphics cards?
At work I've got a Radeon X1300 and I'm thinking of borrowing another to get three monitors attached to my computer.
I saw that most >2 monitor setups are done with xinerama, which unfortunately means that 3d acceleration goes out the window.
Since most posts about setups like these are a bit old, now that we've got PRIME and gpu offloading and DRI2 and whatnot, is there a better way to do triple head without loosing 3d? Obviously with a X1300 it's not for gaming, but I would like to still be able to run compiz and unity.
At the moment, your best bet for more than two displays is to get a radeon card that supports more than 2 displays (evergreen or newer). If you want to use multiple cards, you'll still have to use zaphod mode and xinerama. The xserver prime stuff paves the way for improved multi-card, but it's not implemented yet.
Just to make sure you don't fall into that trap: If you have one card where you want to attach 3 or more monitors only 2 of them can be VGA, DVI or HDMI. Every additional monitor has to be a real DP monitor (native or active DP adapter).
The limitation is the number of display clocks (there are only 2 for non-DP monitors). As of kernel 3.7, you can actually have more than 2 non-DP monitors as long as they at least two of them have the exact same pixel clock. If you want more than two monitors with independent timings, you'll need to use DP monitors for that additional monitors.
Originally Posted by droste
What about cards like Sapphire Flex, which claim to support three normal (=non-DP) outputs? Are those supported?
I have no idea what kind of hack they do to get that, if it's adding some real components or not.