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使用 2x2 比例的 xrandr 后，ubuntu 运行缓慢

tag-icon • tag-icon 14.04 performance xrandr
使用 2x2 比例的 xrandr 后，ubuntu 运行缓慢

我最近购买了一台具有 HighDpi 分辨率（3200x1800）的戴尔 XPS。

出于某种原因，当我将笔记本电脑屏幕扩展到另一台显示器（1920x1800）时，第二台显示器上的所有内容都会变得非常大。因此，我可以通过运行以下xrandr命令来修复此问题：

xrandr --output eDP1 --auto --output DP1 --auto --panning 3840x2160+3200+0 --scale 2x2 --right-of eDP1

eDP1- 主监视器

DP1- 扩展监视器

一切都很美好，但计算机启动时执行任何任务的速度都非常慢（甚至只运行 sublime 进行文本编辑）。CPU 和内存都正常。原因似乎是屏幕渲染...

有人可以合理地解释一下为什么会发生这种情况吗？

谢谢你！

$ xrandr --current

Screen 0: minimum 8 x 8, current 7040 x 2160, maximum 32767 x 32767
eDP1 connected primary 3200x1800+0+0 (normal left inverted right x axis y axis) 294mm x 165mm
   3200x1800      60.0*+   48.0  
   2048x1536      60.0  
   1920x1440      60.0  
   1856x1392      60.0  
   1792x1344      60.0  
   1920x1200      60.0  
   1920x1080      59.9  
   1600x1200      60.0  
   1680x1050      60.0     59.9  
   1600x1024      60.2  
   1400x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x960       60.0  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
DP1 connected 3840x2160+3200+0 (normal left inverted right x axis y axis) 598mm x 336mm panning 3840x2160+3200+0
   1920x1080      60.0*+   50.0     59.9  
   1920x1080i     60.1     50.0     60.0  
   1600x1200      60.0  
   1280x1024      75.0     60.0  
   1152x864       75.0  
   1280x720       60.0     50.0     59.9  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   720x576        50.0  
   720x480        60.0     59.9  
   640x480        75.0     60.0     59.9  
   720x400        70.1  
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

更新：

我无法修复此问题。因此，我只能匹配分辨率以避免分辨率差异：

$xrandr --current
Screen 0: minimum 8 x 8, current 1936 x 2160, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+1080 (normal left inverted right x axis y axis) 294mm x 165mm
   3200x1800      60.0 +   48.0  
   2048x1536      60.0  
   1920x1440      60.0  
   1856x1392      60.0  
   1792x1344      60.0  
   1920x1200      60.0  
   1920x1080      59.9* 
   1600x1200      60.0  
   1680x1050      60.0     59.9  
   1600x1024      60.2  
   1400x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x960       60.0  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
DP1 connected 1920x1080+16+0 (normal left inverted right x axis y axis) 598mm x 336mm
   1920x1080      60.0*+   50.0     59.9  
   1920x1080i     60.1     50.0     60.0  
   1600x1200      60.0  
   1280x1024      75.0     60.0  
   1152x864       75.0  
   1280x720       60.0     50.0     59.9  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   720x576        50.0  
   720x480        60.0     59.9  
   640x480        75.0     60.0     59.9  
   720x400        70.1  
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

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