Gru*_*bel 15 xfce xorg multiple-monitors hdmi
我运行 Ubuntu 16.04（开发分支），XFCE 作为桌面环境。
我的电脑连接到两台显示器。一个通过常规 VGA 电缆，另一个连接到 HDMI 切换器。该设置工作正常，但每次我临时将 HDMI 切换器更改为另一个 HDMI 连接时，Xorg 检测到显示器已断开连接并将 Xorg 重新配置为仅使用一台显示器，将 HDMI 切换器切换回我的计算机并不会重新激活双显示器使用任一，我必须手动触发xrandr
如何防止发生这种自动监视器检测和重新配置？我希望能够在电脑不做任何事情的情况下切换 HDMI 切换器。
用于恢复多显示器设置的命令：
xrandr \
--output HDMI-1 \
--mode "1920x1080" \
--panning "1920x1080+1280+0/0x0+0+0" \
--output DVI-1-I \
--mode "1280x1024" \
--panning "1280x1024/0x0+0+0"
经常使用的 xrandr 输出：
Screen 0: minimum 320 x 200, current 3200 x 1080, maximum 8192 x 8192
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 connected 1920x1080+1280+0 (normal left inverted right x axis y axis) 443mm x 249mm panning 1920x1080+1280+0
1920x1080 60.00*+ 60.00 50.00 59.94 59.93
1920x1080i 60.00 50.00 59.94
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 74.76 70.00 59.98
1280x1024 75.02 60.02
1440x900 59.89 59.90
1280x960 60.00
1360x768 59.80 59.96
1280x800 59.91
1152x864 75.00 75.00 70.00 60.00
1280x720 60.00 50.00 59.94
1024x768 60.04 75.03 70.07 60.00
960x720 75.00 60.00
928x696 75.00 60.05
896x672 75.05 60.01
960x600 60.00
832x624 74.55
960x540 59.99
800x600 75.00 70.00 65.00 60.00 72.19 75.00 60.32 56.25
840x525 74.96 69.88 60.01 59.88
720x576 50.00
800x512 60.17
700x525 74.76 70.06 59.98
720x480 60.00 59.94
640x512 75.02 60.02
720x450 59.89
640x480 60.00 72.81 75.00 66.67 60.00 59.94
720x400 70.08
680x384 59.80 59.96
576x432 75.00 75.00 70.00 60.06
512x384 75.03 70.07 60.00
416x312 74.66
400x300 72.19 75.12 60.32 56.34
320x240 72.81 75.00 60.05
DVI-I-1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 359mm x 287mm
1280x1024 60.02*+ 75.02
1280x960 60.00
1280x800 74.93 59.81
1152x864 75.00
1280x768 74.89 59.87
1280x720 60.00
1024x768 75.08 75.03 70.07 60.00
1024x576 59.97
832x624 74.55
800x600 72.19 75.00 70.01 60.32 56.25
848x480 60.00
640x480 75.00 72.81 66.67 60.00
720x400 70.08
当 HDMI 切换器切换到不同连接时的 xrandr 输出：
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 8192 x 8192
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 359mm x 287mm
1280x1024 60.02*+ 75.02
1280x960 60.00
1280x800 74.93 59.81
1152x864 75.00
1280x768 74.89 59.87
1280x720 60.00
1024x768 75.08 75.03 70.07 60.00
1024x576 59.97
832x624 74.55
800x600 72.19 75.00 70.01 60.32 56.25
848x480 60.00
640x480 75.00 72.81 66.67 60.00
720x400 70.08
我尝试过的更多事情：
连接显示器后，找出模式行：
$ xvidtune -show
"1920x1080" 148.50 1920 2008 2052 2200 1080 1084 1089 1125 -hsync +vsync
然后断开显示器：
$ xrandr --newmode "1920x1080-new" 148.50 1920 2008 2052 2200 1080 1084 1089 1125 -hsync +vsync
$ xrandr --addmode HDMI-1 1920x1080-new
$ xrandr --output HDMI-1 --mode 1920x1080-new
这允许我在断开连接时激活显示器，否则会由于不存在的 1920x1080 模式而失败。然而，问题仍然存在，如果我切换 HDMI 切换器，即使我将其设置为自定义模式，显示器也会被禁用。
这是断开显示器与 HDMI 切换器的连接时的 udev 事件：
$ udevadm monitor --property
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent
KERNEL[41678.571099] change /devices/pci0000:00/0000:00:02.0/0000:01:00.0/drm/card0 (drm)
ACTION=change
DEVNAME=/dev/dri/card0
DEVPATH=/devices/pci0000:00/0000:00:02.0/0000:01:00.0/drm/card0
DEVTYPE=drm_minor
HOTPLUG=1
MAJOR=226
MINOR=0
SEQNUM=3248
SUBSYSTEM=drm
UDEV [41678.573432] change /devices/pci0000:00/0000:00:02.0/0000:01:00.0/drm/card0 (drm)
ACTION=change
DEVNAME=/dev/dri/card0
DEVPATH=/devices/pci0000:00/0000:00:02.0/0000:01:00.0/drm/card0
DEVTYPE=drm_minor
HOTPLUG=1
ID_FOR_SEAT=drm-pci-0000_01_00_0
ID_PATH=pci-0000:01:00.0
ID_PATH_TAG=pci-0000_01_00_0
MAJOR=226
MINOR=0
SEQNUM=3248
SUBSYSTEM=drm
TAGS=:uaccess:master-of-seat:seat:
USEC_INITIALIZED=31279519
这是使用 HDMI 切换器重新启用显示器时的 udev 事件：
$ udevadm monitor --property
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent
KERNEL[41696.104481] change /devices/pci0000:00/0000:00:02.0/0000:01:00.0/drm/card0 (drm)
ACTION=change
DEVNAME=/dev/dri/card0
DEVPATH=/devices/pci0000:00/0000:00:02.0/0000:01:00.0/drm/card0
DEVTYPE=drm_minor
HOTPLUG=1
MAJOR=226
MINOR=0
SEQNUM=3249
SUBSYSTEM=drm
UDEV [41696.105685] change /devices/pci0000:00/0000:00:02.0/0000:01:00.0/drm/card0 (drm)
ACTION=change
DEVNAME=/dev/dri/card0
DEVPATH=/devices/pci0000:00/0000:00:02.0/0000:01:00.0/drm/card0
DEVTYPE=drm_minor
HOTPLUG=1
ID_FOR_SEAT=drm-pci-0000_01_00_0
ID_PATH=pci-0000:01:00.0
ID_PATH_TAG=pci-0000_01_00_0
MAJOR=226
MINOR=0
SEQNUM=3249
SUBSYSTEM=drm
TAGS=:seat:master-of-seat:uaccess:
USEC_INITIALIZED=31279519
.
$ sudo lshw -c display
*-display
description: VGA compatible controller
product: Redwood XT [Radeon HD 5670/5690/5730]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:01:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:55 memory:c0000000-cfffffff memory:fea20000-fea3ffff ioport:e000(size=256) memory:c0000-dffff
对于其他 Cinnamon 和 Gnome，可以在这里找到解决方案：
肉桂：
gsettings set org.cinnamon.settings-daemon.plugins.xrandr active false
侏儒：
gsettings set org.gnome.settings-daemon.plugins.xrandr active false
这不是最终答案，只是指向正确方向的指针。在XFCE上，xfsettingsd程序负责处理事件RRScreenChangeNotify并触发模式切换，具体函数可以在xfce4-settings-4.12.0/xfsettingsd/displays.c第77行找到，该函数被调用xfce_displays_helper_screen_on_event。禁用该功能将使连接新显示器时模式不再改变。
可以通过以下方式获取调试信息：
DISPLAY=:0 XFSETTINGSD_DEBUG=512 xfsettingsd --replace --no-daemon
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