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如何在 Ubuntu 18.04（xorg）中从命令行更改显示比例

tag-icon • tag-icon xorg 18.04 scaling gnome-control-center hdpi
如何在 Ubuntu 18.04（xorg）中从命令行更改显示比例

我尝试在命令行中获得与从 Gnome 控制中心更改显示比例因子相同的效果。

我尝试了以下命令，但没有任何效果：

gsettings 设置 org.gnome.desktop.interface 缩放因子 2

我需要此命令来构建一种小数比例因子，该比例因子由 xrandx 和 Gnome 控制中心中的缩放因子组合而成。由于 xrandr 的执行会重置 Gnome 控制中心中的缩放因子，因此我需要一个命令来恢复 Gnome 控制中心中的值。

欢迎提出任何建议。提前致谢。

答案1

看看gnome-control-center源代码，事实证明这是通过 dbus 进行配置的。这是一个在单显示器配置中在 100% 和 200% 之间切换的脚本。

#!/usr/bin/python3
# Note: use system python3, not /usr/bin/env, because whichever python3 is on
# $PATH may not have dbus, but the system python3 does.

"""Toggle display scaling between 100% and 200%.

Based on https://gist.github.com/strycore/ca11203fd63cafcac76d4b04235d8759

For data structure definitions, see
https://gitlab.gnome.org/GNOME/mutter/blob/master/src/org.gnome.Mutter.DisplayConfig.xml
"""

import dbus

namespace = "org.gnome.Mutter.DisplayConfig"
dbus_path = "/org/gnome/Mutter/DisplayConfig"

session_bus = dbus.SessionBus()
obj = session_bus.get_object(namespace, dbus_path)
interface = dbus.Interface(obj, dbus_interface=namespace)

current_state = interface.GetCurrentState()
serial = current_state[0]
connected_monitors = current_state[1]
logical_monitors = current_state[2]

# Multiple monitors are more complicated. For now, since I only use one monitor
# in Ubuntu, everything is hard-coded so that only info about the first monitor
# is used, and only it will be connected after running the script.
#
# If someday updating this script: a logical monitor may appear on mutiple
# connected monitors due to mirroring.
connector = connected_monitors[0][0][0]
current_mode = None
# ApplyMonitorsConfig() needs (connector name, mode ID) for each connected
# monitor of a logical monitor, but GetCurrentState() only returns the
# connector name for each connected monitor of a logical monitor. So iterate
# through the globally connected monitors to find the mode ID.
for mode in connected_monitors[0][1]:
    if mode[6].get("is-current", False):
        current_mode = mode[0]
updated_connected_monitors = [[connector, current_mode, {}]]

x, y, scale, transform, primary, monitors, props = logical_monitors[0]
scale = 2.0 if scale == 1.0 else 1.0

monitor_config = [[x, y, scale, transform, primary, updated_connected_monitors]]

# Change the 1 to a 2 if you want a "Revert Settings / Keep Changes" dialog
interface.ApplyMonitorsConfig(serial, 1, monitor_config, {})

答案2

通过单独运行 xrandr 来确定你的输出设备（我的是 DP-1），然后使用以下命令：

gsettings set org.gnome.desktop.interface scaling-factor 2
gsettings set org.gnome.settings-daemon.plugins.xsettings overrides "{'Gdk/WindowScalingFactor': <2>}"
xrandr --output DP-1 --scale 1.5x1.5
xrandr --output DP-1 --panning 3840x2160

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