我的笔记本电脑 （戴尔 Latitude e5270) 无法通过 vga 电缆与显示器连接（hdmi 工作正常）。如果我将其插入，什么也没有发生；我只能使用内置屏幕（或我将其插入的任何 HDMI 显示器）。
该 VGA 显示器本身可以工作，因为我将它与其他设备一起使用，并且它通过电缆连接良好。我认为我的笔记本电脑在 Ubuntu 17 版本上毫无问题地连接到 VGA 显示器。
英特尔® 核芯显卡 520
插入 VGA 时 xrandr：
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
XWAYLAND0 connected 1366x768+0+0 (normal left inverted right x axis y
axis) 280mm x 160mm
1366x768 59.98*+
xrand——详细
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
XWAYLAND0 connected 1366x768+0+0 (0x24) normal (normal left inverted
right x axis y axis) 280mm x 160mm
Identifier: 0x21
Timestamp: 28178
Subpixel: unknown
Gamma: 1.0:1.0:1.0
Brightness: 0.0
Clones:
CRTC: 0
CRTCs: 0
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
1366x768 (0x24) 85.000MHz -HSync +VSync *current +preferred
h: width 1366 start 1431 end 1567 total 1776 skew 0 clock
47.86KHz
v: height 768 start 771 end 781 total 798 clock
59.98Hz
串行通信
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th
Gen Core Processor Host Bridge/DRAM Registers (rev 08)
00:02.0 VGA compatible controller: Intel Corporation Skylake GT2 [HD
Graphics 520] (rev 07)
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200
v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 08)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0
xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-
LP Thermal subsystem (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP
CSME HECI #1 (rev 21)
00:16.3 Serial controller: Intel Corporation Device 9d3d (rev 21)
00:17.0 RAID bus controller: Intel Corporation 82801 Mobile SATA
Controller [RAID mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express
Root Port #5 (rev f1)
00:1d.0 PCI bridge: Intel Corporation Device 9d1a (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller
(rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev
21)
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev
21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection
I219-LM (rev 21)
01:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd.
RTS525A PCI Express Card Reader (rev 01)
lspci -k | grep -A 2 -i “VGA”
00:02.0 VGA compatible controller: Intel Corporation Skylake GT2 [HD
Graphics 520] (rev 07)
Subsystem: Dell Skylake GT2 [HD Graphics 520]
Kernel driver in use: i915