Ubuntu11.04 solves the problem of low resolution of external display

My laptop is ThinkPad, and the external display is set to 1680x1050.

First, familiarize yourself with the command:

The xrandroid command line allows you to easily switch between two screens. The common method is as follows. You can explore other methods by yourself:
Xrandroid -- output VGA -- same-as LVDS -- Auto
Turn on the external monitor (maximum resolution), the same content as the notebook LCD screen (clone)
Xrandroid -- output VGA -- same-as LVDS -- Mode 1024x768
Turn on the external monitor (resolution: 1024x768) and display the same content as the LCD screen of the notebook (clone)
Xrandroid -- output VGA -- right-of LVDS -- Auto
Turn on the external monitor (maximum resolution) and set it to extend the screen on the right
Xrandroid -- output VGA -- off
Turn off external display
Xrandroid -- output VGA -- Auto -- output LVDS -- off
Turn on the external monitor and turn off the notebook LCD screen (only use the External Monitor)
Xrandroid -- output VGA -- off -- output LVDS -- Auto
Turn off the external monitor and turn on the notebook LCD screen (only use the notebook LCD screen)

Then, set it as follows.

1,
$ CVT 1440 900
The result is as follows:
#1440x900 59.89Hz (CVT 1.30ma) hsync: 55.93 kHz; pclk: 106.50 MHz
Modeline "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909-hsync + vsync

The value following modeline must be used below. Then execute

2,
$ Xrandroid
The display name is obtained. My name is vga1 and my notebook is lvds1. The same is true for everyone.

3,
$ Sudo xrandroid -- newmode "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909-hsync + vsync
The parameter is the heap after modeline In the CVT result, which is adjusted according to its own parameters.

4,
$ Xrandroid
You can see the newly added setting.
Then add a new mode and execute

5,
$ Sudo xrandroid -- addmode vga1 "1440x900_60.00"

Next, let's just set it up. Let's take a look at the commands for xrandroid. www.linuxidc.com. I just say that my laptop is on the left 1366X768, and the external monitor is on the right 1440x900, that is, the expanded screen on the right

6,
$ Xrandroid -- output vga1 -- Mode 1440x900_60.00 -- right-of lvds1
Turn on the external monitor (maximum resolution) and set it to extend the screen on the right

Then, write the script:

#! /Bin/sh

# Monitor. Sh
# Check whether the external monitor is connected:
# Returns 0 on success
Xrandroid | grep VGA | grep "connected"
If [$? -EQ 0]; then
Xrandroid -- newmode "1680x1050_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088-hsync + vsync
# Xrandroid -- newmode "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909-hsync + vsync
Xrandroid -- addmode vga1 "1680x1050_60.00"
# Xrandroid -- addmode vga1 "1440x900_60.00"
Xrandroid -- output vga1 -- Mode 1680x1050_60.00 -- right-of lvds1
# Xrandroid -- output vga1 -- Mode "1440x900_60.00" -- right-of lvds1
Else
Xrandroid -- output vga1 -- off
Fi

Run it again. Run the xrandroid command to check whether the resolution you want to set exists. If not, run the preceding script again. If:

Xrandroid -- output vga1 -- Mode 1680x1050_60.00 -- same-as lvds1

Turn off the notebook display:

Xrandroid -- output lvds1 -- off

That's all. You can also write a self-starting script to run each time you start the system.

Run the following command to view the Ubuntu version: CAT/etc/issue.