无法为crtc 64（15.04）设置配置

有时当我连接第二台LCD显示器（iiyama ProLite E2407HDSV）

眼镜：

Native resolution   Full HD 1080p, 1920 x 1080 ( 2.1 megapixel)
Horizontal sync 30-81 KHz
Vertical sync 56-75 Hz

到我的华硕N56J笔记本电脑

显示规格：

15.6" IPS 1920 x 1080 ( Full HD ) 

我尝试用液晶显示器扩展笔记本电脑显示器时出现错误：

could not set the configuration for crtc 64

经过几次尝试，它确实可以工作并且错误消失了。另外，当我进入显示设置时，会得到一个透明窗口，如下所示：

此外，还安装了以下其他驱动程序：

myuser@my-laptop:~$ xrandr：

Screen 0: minimum 8 x 8, current 3520 x 1200, maximum 16384 x 16384
eDP1 connected primary 1920x1080+0+0 344mm x 194mm
   1920x1080      60.1*+   59.9  
   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  
HDMI1 disconnected
VGA1 connected 1600x1200+1920+0 521mm x 293mm
   1600x1200      60.0* 
   1680x1050      60.0  
   1280x1024      75.0     60.0  
   1440x900       75.0     59.9  
   1152x864       75.0  
   1024x768       75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   640x480        75.0     72.8     66.7     60.0  
   720x400        70.1  
VIRTUAL1 disconnected

myuser@my-laptop:~$ sudo lshw -c video：

[sudo] password for myuser: 
  *-display               
       description: 3D controller
       product: GM108M [GeForce 840M]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       version: a2
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list rom
       configuration: driver=nvidia latency=0
       resources: irq:42 memory:f6000000-f6ffffff memory:e0000000-efffffff memory:f0000000-f1ffffff ioport:e000(size=128) memory:f7000000-f707ffff
  *-display
       description: VGA compatible controller
       product: 4th Gen Core Processor Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 06
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:39 memory:f7400000-f77fffff memory:d0000000-dfffffff ioport:f000(size=64)

myuser@my-laptop:~$ lspci | grep VGA：

00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06

myuser@my-laptop:~$ uname -r：

3.19.0-30-generic

myuser@my-laptop:~$ X -version：

X.Org X Server 1.17.1
Release Date: 2015-02-10
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.19.0-28-generic x86_64 Ubuntu
Current Operating System: Linux mva-laptop 3.19.0-30-generic #33-Ubuntu SMP Mon Sep 21 20:58:04 UTC 2015 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.19.0-30-generic root=UUID=a1d7434a-6c0f-4117-8d2f-1e32f902475f ro quiet splash
Build Date: 11 September 2015  10:30:58AM
xorg-server 2:1.17.1-0ubuntu3.1 (For technical support please see http://www.ubuntu.com/support) 
Current version of pixman: 0.32.6
    Before reporting problems, check http://wiki.x.org
    to make sure that you have the latest version.

根据外屏的规格，建议您更改设置以使其符合其原始分辨率。根据您的xrandr输出，您已将其配置为1600x1200 @ 60 Hz，制造商建议您在联系iiyama信息行之前进行操作（在手册中）是“检查是否已通过'显示选择了正确的原始分辨率 '。属性”。

要使用制造商建议的分辨率进行设置，您可以使用生成一个Modeline cvt。由于这是TFT显示屏，因此我找不到任何指示，因此我使用60的刷新率来生成Modeline。

因此，您将使用以下方式生成模型：

cvt 1920 1080 60 其结果类似于以下内容：

1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz
Modeline "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync

然后，您可以通过xrandr将modeline应用于：

xrandr --newmode 一切的Modeline后来自无级变速器输出 包括引号，然后

xrandr --addmode VGA1 1920x1080_60.00

VGA1是显示器连接到的端口，其余部分是cvt输出引号之间的所有内容

资料来源：

https://www.manualslib.com/manual/673627/Iiyama-Prolite-E2407hds.html#manual

http://www.kmart.com/asus-n56j-15.6inch-notebook-with-intel-core-i7/p-020V007360940000P

http://www.manualmonitor.com/manuals/iiyama/Iiyama_ProLite_E2407HDS-1.pdf

https://help.ubuntu.com/community/NvidiaResolutionXorgConf

如何设置自定义分辨率？