I have these problems on a W520 (i.e. Nvidia driver), but on Arch Linux. Still, what I have found, and a workaround:
The Nvidia driver will try to make the whole size of the screen (set with xrandr --fb or by placing monitors) accessible with the monitors it has, and if need be with panning. It will ignore or overwrite all attempts to disable that panning if the driver thinks you need it. (It's a feature, they brag about it under question "How are virtual screen dimensions determined in TwinView?" at http://us.download.nvidia.com/XFree86/Linux- x86_64/346.35/README/configtwinview.html On my setup, I use two external monitors that are connected to the Nvidia card along with the built-in monitor that is connected to the internal Intel chip. The intel chip servers as a Sink provider for the Nvidia driver, so all three monitors form a single screen, like so: xrandr --setprovideroutputsource modesetting NVIDIA-0 xrandr --fb 5760x1200 --output LVDS-1-0 --mode 1920x1080 --pos 3840x120 --output VGA-0 --mode 1920x1200 --pos 1920x0 --output DP-3 --mode 1920x1200 --pos 0x0 The nvidia driver (so it seems) will accept that the whole screen is now 5760x1200 big, but only uses the two monitors that are actually connected to the card to "cover" that area with panning. So the right- most laptop display worked fine, while the two monitors would pan along left and right. I have worked around this by abusing that while the Nvidia driver ignores or overwrites the core panning parameters, it doesn't meddle with the panning border. I modified the command above like so: xrandr --fb 5760x1200 --output LVDS-1-0 --mode 1920x1080 --pos 3840x120 --panning 5760x1200+0+0/0x0+0+0/-3840/0/0/0 --output VGA-0 --mode 1920x1200 --pos 1920x0 --panning 5760x1200+0+0/0x0+0+0/-1920/0/-1920/0 --output DP-3 --mode 1920x1200 --pos 0x0 --panning 5760x1200+0+0/0x0+0+0/0/0/-3840/0 This sets the borders that trigger the panning so far out that they are all off screen. So panning is technically still enabled but impossible to trigger. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1326688 Title: Can't disable panning on multiple monitors Status in xorg-server package in Ubuntu: Confirmed Bug description: System: Dell laptop E6520 with two graphic cards: 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller]) 01:00.0 VGA compatible controller: NVIDIA Corporation GF119M [NVS 4200M] (rev a1) (prog-if 00 [VGA controller]) I have 3 monitors connected through docking stations, DP-0 and DP-1 connected to Nvidia card and VGA-1-0 connected to Intel card. I'm usind nvida-331 driver and nvidia-prime: nbr@nbr-nb:~$ dpkg --get-selections | grep nvidia nvidia-331 install nvidia-common install nvidia-libopencl1-331 install nvidia-opencl-icd-331 install nvidia-prime install nvidia-settings install I can setup correctly this triple-head config with Monitor Settings in Ubuntu Control Panel, but this enable panning as per xrandr output: nbr@nbr-nb:~$ xrandr -q | grep conn VGA-0 disconnected (normal left inverted right x axis y axis) LVDS-0 disconnected (normal left inverted right x axis y axis) DP-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm panning 2560x1024+0+0 tracking 4240x1050+0+0 border 0/0/0/0 DP-1 connected primary 1680x1050+1280+0 (normal left inverted right x axis y axis) 433mm x 270mm panning 2960x1050+1280+0 tracking 4240x1050+0+0 border 0/0/0/0 HDMI-0 disconnected (normal left inverted right x axis y axis) DP-2 disconnected (normal left inverted right x axis y axis) DP-3 disconnected (normal left inverted right x axis y axis) LVDS-1-0 connected VGA-1-0 connected 1280x1024+2960+0 376mm x 301mm and it seems there is no way to disable it (even issuing xrandr with --panning 0x0+0+0 option to DP-0 and DP-1 has no effect). This was working correctly after a undock/dock of the laptop, maybe an update broke config since it has always showed problems with undock/dock, but a reboot always cured the situation. Now it can't be setup like initial config anymore (three indipendent monitors with no panning and windows moving around all monitors). other sysinfo: nbr@nbr-nb:~$ lsb_release -rd Description: Ubuntu 14.04 LTS Release: 14.04 nbr@nbr-nb:~$ apt-cache policy nvidia-331 nvidia-331: Installato: 331.38-0ubuntu7 nbr@nbr-nb:~$ apt-cache policy nvidia-prime nvidia-prime: Installato: 0.6.2 nbr@nbr-nb:~$ apt-cache policy xserver-xorg xserver-xorg: Installato: 1:7.7+1ubuntu8 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1326688/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
