Dual monitors working, but windows only on primary display
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Hi everyone, I'm struggling with a problem and I hope one of you can point me in the right direction! I'm running with dual monitors (two identical LCD displays), connected to a Radeon 7850 video card. This seems to work OK; the displays are not mirrored, and I can drag my mouse across from one monitor to the other--even set wallpapers on both of them. BUT, if I try to drag a window onto my second monitor, the part that should extend onto the 2nd monitor just disappears. If I look at Display Settings, only one monitor shows up (DFP6). If I type 'xrandr -q', it's the same thing: just one display (DFP6). But if I dump out /var/log/Xorg.0.log, I can see the two screens configured in my xorg.conf file being assigned to outputs (DFP6 and DPF7).
It's like at the driver level, my video card is happily driving two displays in dual head mode, but the Xorg server has somehow lost the plot (despite all the promising things it said in Xorg.0.log). I'm using the proprietary fglrx drivers (version 14.20.7). I was originally using the Xorg drivers, but the symptoms I ran into were even worse (the displays were mirrored). System Summary OS: Kubuntu 14.10 Video Card: Radeon 7850 with two DVI-D outs (and an HDMI out that is not connected to anything). Displays: two Samsung Syncmaster LCDs. Video Drivers: fglrx 14.20.7 How I got here (possibly-irrelevant backstory) 1) Was happily using Kubuntu 14 and open-source Xorg drivers, with no problems. 2) Took upgrade to Kubuntu 15/ Plasma 5. 3) Had some major issues with my workspace initializing correctly and getting to a state where it could launch programs. Decided to reinstall Kubuntu 14. 4) For a brief time, everything was wonderful. 5) Took more system updates (NOT Kubuntu 15) 6) The next time I started up it looked like I was in default VGA mode; displays were mirrored, some artifacts in window bars, things weren't very snappy. 7) After various unsuccessful experiments, installed fglrx drivers. Now things are snappy, and displays are no longer mirrored, but as mentioned above, I can only get windows on my primary display. Xorg.0.log:
xrandr -q:
xorg.conf (this is almost exactly what aticonfig generated for me; except I added "screen 1" to the second device section, hoping that might fix things.
I hope this quickens some intuition in somebody. I'd like to understand why xrandr doesn't know anything about the second display, but I'm not sure where to start digging. Many thanks! |
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You configured yourself a zaphod mode setup, the behavior is expected.
See here https://wiki.archlinux.org/index.php/Multihead. Outputs (that's different from "screens", you only want one screen) are configured through the randr extension at runtime (eg. through xrandr or the kscreen daemon or whatever) That config was apparently written by some fglrx config tool - just (re)move it: unless you need special options, things are supposed to work configless nowerdays. |
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Ah, thanks, that helped a lot. I was following the directions that came with the flgrx driver, and they told me to run aticonfig--that's what made the xorg.conf. I removed it and rebooted, and indeed xrandr now sees both displays! I was even able to configure via System Settings once I realized that the box-visualizations of the two displays were perfectly stacked on top of each other.
The settings I'm making in the System Settings "Display and Monitor" panel aren't sticking between reboots, but this is something I can live with. At least I can use both monitors again. |
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