[Bug 64850] Second screen black on Pitcairn PRO

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=64850

--- Comment #19 from akb825 at 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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