Created attachment 17154 [details] xorg.conf from one-Screen configuration (corruption) I have two R370 cards, each with two 1280x1024 monitors on them. I am attempting to set up a quad-head configuration with the version of the driver at git commit b416e97a1f16ef700ba1aaca317dee82b7a3cf64 . I have successfully tested a dual-head configuration and a quad-head configuration with two separate "Screen" sections. However, this does not integrate well with my window manager (KDE) and I have been trying to get all the monitors as viewports on a single "Screen" section. When I change the Virtual size from 2560x1024 to 5120x1024, the output on the screen becomes massively corrupted. I also cannot move the cursor onto the third or fourth monitor (those on the second device), although the modes are initialised; I suspect this is because I either haven't understood the configuration file properly or because I'm trying to do something that can't be done. However, the corruption is the bug that I'm reporting. xorg.conf and associated log in one-Screen and two-Screen configurations to be attached.
Created attachment 17155 [details] Log from one-Screen configuration (corruption)
Created attachment 17156 [details] xorg.conf from two-Screen configuration (working)
Created attachment 17157 [details] Log from two-Screen configuration (working)
> I have been trying to get all the monitors as viewports on a single "Screen" > section. That's not possible (yet?) with multiple GPUs. You can see in the log file that it's only driving one card. > When I change the Virtual size from 2560x1024 to 5120x1024, the output on > the screen becomes massively corrupted. Does Option "AccelMethod" "EXA" make a difference for this?
Yes, using an AccelMethod of EXA does seem to fix the problem. Updated configuration file and log to be attached.
Created attachment 17199 [details] Log with large Virtual and EXA (no corruption)
Created attachment 17200 [details] xorg.conf with large Virtual and EXA (no corruption)
Closing as EXA seems to fix it.
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