Comment # 19
on bug 64850
from akb825@gmail.com
I have a Radeon 7870 and I have the same problem: the desktop extends as if there are 2 monitors, but the second monitor is always black. I have both monitors plugged into DVI ports (DVI-0 and DVI-1), and xrandr correctly recognizes both monitors as being present as well as all of their display modes, but whenever I try to change the display to one monitor or the other it will only ever display on the monitor plugged into DVI-0. When I go through the display settings tool in XFCE (which I'm assuming is just a UI around xrandr) it correctly shows both monitors, but whenever I try to adjust the second monitor's resolution or disable the second monitor it completely corrupts the display (showing a striped pattern on the first monitor, second monitor is still black) and the only way to recover is to reboot. I can switch to a tty terminal and blindly type commands, but when I attempted to shut down my display manager daemon and unload the radeon module nothing happened, though since the display was corrupted I couldn't see if either of the commands failed. Adjusting the resolution of the first monitor works correctly. One thing to note is whenever I start xorg, the following gets printed several times to the error log: May 29 20:27:31 localhost kernel: [ 199.484959] radeon 0000:02:00.0: bo ffff8801ad899400 don't has a mapping in vm ffff8801affc6980 I am also using 64-bit Arch Linux, running under kernel 3.9.4 and xorg 1.14.1.
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