我安装了 displayLink，具体如下：页
但是，不起作用。显然在我的 PC 上，一切正常。
- Displaylink 设备：联想增强型 USB 端口复制器 usb 2.0。
- 笔记本电脑：联想 t430
- 操作系统：Ubuntu 16.04.1 LTS
我使用以下命令来激活第三台显示器：
# xrandr --newmode "1024x768_60.00" 63.50 1024 1072 1176 1328 768 771 775 798 -hsync +vsync
# xrandr --addmode DVI-I-1 "1024x768_60.00
但是，当我输入第二条命令时，所有屏幕都冻结并且光标变得非常慢，然后，我重新启动了我的电脑。
也用过这个脚本不成功。
我还放了一些重要命令的输出：
xrandr --listproviders
# xrandr --listproviders
Providers: number : 2
Provider 0: id: 0x4c cap: 0x9, Source Output, Sink Offload crtcs: 4 outputs: 9 associated providers: 1 name:Intel
Provider 1: id: 0x125 cap: 0x2, Sink Output crtcs: 1 outputs: 1 associated providers: 1 name:modesetting
xrandr——当前
# xrandr --current
Screen 0: minimum 8 x 8, current 2732 x 768, maximum 32767 x 32767
LVDS1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
1366x768 59.99*+
1360x768 59.80 59.96
1280x720 60.00
1024x768 60.00
1024x576 60.00
960x540 60.00
800x600 60.32 56.25
864x486 60.00
640x480 59.94
720x405 60.00
680x384 60.00
640x360 60.00
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 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)
HDMI3 disconnected (normal left inverted right x axis y axis)
VGA1 connected 1366x768+1366+0 (normal left inverted right x axis y axis) 410mm x 230mm
1366x768 59.79*+
1280x1024 60.02
1280x720 60.00
1024x768 60.00
800x600 60.32
640x480 60.00
720x400 70.08
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected
1024x768 75.08 70.07 60.00
800x600 72.19 75.00 60.32
640x480 75.00 72.81 66.67 60.00
720x400 70.08
1024x768 (0xef) 65.000MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz
v: height 768 start 771 end 777 total 806 clock 60.00Hz
800x600 (0xf2) 40.000MHz +HSync +VSync
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz
v: height 600 start 601 end 605 total 628 clock 60.32Hz
640x480 (0xfb) 25.200MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.50KHz
v: height 480 start 490 end 492 total 525 clock 60.00Hz
720x400 (0xfc) 28.320MHz -HSync +VSync
h: width 720 start 738 end 846 total 900 skew 0 clock 31.47KHz
v: height 400 start 412 end 414 total 449 clock 70.08Hz
状态 displaylink.service
# systemctl status displaylink.service
● displaylink.service - DisplayLink Manager Service
Loaded: loaded (/lib/systemd/system/displaylink.service; enabled; vendor preset: enabled)
Active: active (running) since jue 2016-08-18 23:17:37 VET; 22min ago
Process: 2656 ExecStartPre=/sbin/modprobe evdi (code=exited, status=0/SUCCESS)
Main PID: 2668 (DisplayLinkMana)
CGroup: /system.slice/displaylink.service
└─2668 /usr/lib/displaylink/DisplayLinkManager
ago 18 23:17:36 p1tag0ras systemd[1]: Starting DisplayLink Manager Service...
ago 18 23:17:37 p1tag0ras systemd[1]: Started DisplayLink Manager Service.
连接displaylink设备时的dmesg输出：
[ 15.560206] evdi: module verification failed: signature and/or required key missing - tainting kernel
[ 15.561084] evdi: [I] Initialising logging on level 5
[ 15.778509] IPv6: ADDRCONF(NETDEV_UP): wlp3s0: link is not ready
[ 15.778651] iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
[ 15.786261] iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
[ 15.786360] iwlwifi 0000:03:00.0: Radio type=0x2-0x0-0x0
[ 16.031617] iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
[ 16.039252] iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
[ 16.039348] iwlwifi 0000:03:00.0: Radio type=0x2-0x0-0x0
[ 16.095942] IPv6: ADDRCONF(NETDEV_UP): wlp3s0: link is not ready
[ 16.099730] IPv6: ADDRCONF(NETDEV_UP): enp0s25: link is not ready
[ 16.352916] IPv6: ADDRCONF(NETDEV_UP): enp0s25: link is not ready
[ 16.549009] IPv6: ADDRCONF(NETDEV_UP): wlp3s0: link is not ready
[ 27.657702] wlp3s0: authenticate with 98:fc:11:ee:53:1d
[ 27.661497] wlp3s0: send auth to 98:fc:11:ee:53:1d (try 1/3)
[ 27.668024] wlp3s0: authenticated
[ 27.669705] wlp3s0: associate with 98:fc:11:ee:53:1d (try 1/3)
[ 27.673221] wlp3s0: RX AssocResp from 98:fc:11:ee:53:1d (capab=0x411 status=0 aid=4)
[ 27.675739] wlp3s0: associated
[ 27.675800] IPv6: ADDRCONF(NETDEV_CHANGE): wlp3s0: link becomes ready
[ 150.249300] usb 1-1.2: new high-speed USB device number 5 using ehci-pci
[ 150.342078] usb 1-1.2: New USB device found, idVendor=0409, idProduct=005a
[ 150.342085] usb 1-1.2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 150.342804] hub 1-1.2:1.0: USB hub found
[ 150.343097] hub 1-1.2:1.0: 4 ports detected
[ 150.629377] usb 1-1.2.2: new full-speed USB device number 6 using ehci-pci
[ 150.740068] usb 1-1.2.2: New USB device found, idVendor=0d8c, idProduct=0105
[ 150.740076] usb 1-1.2.2: New USB device strings: Mfr=3, Product=1, SerialNumber=0
[ 150.740080] usb 1-1.2.2: Product: USB Multimedia Audio Device
[ 150.740083] usb 1-1.2.2: Manufacturer: C-Media Electronics Inc.
[ 150.742132] input: C-Media Electronics Inc. USB Multimedia Audio Device as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.2/1-1.2.2:1.3/0003:0D8C:0105.0002/input/input18
[ 150.797937] hid-generic 0003:0D8C:0105.0002: input,hidraw1: USB HID v1.00 Device [C-Media Electronics Inc. USB Multimedia Audio Device] on usb-0000:00:1a.0-1.2.2/input3
[ 150.869340] usb 1-1.2.3: new high-speed USB device number 7 using ehci-pci
[ 150.896068] usbcore: registered new interface driver snd-usb-audio
[ 150.978175] usb 1-1.2.3: New USB device found, idVendor=0409, idProduct=005a
[ 150.978179] usb 1-1.2.3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 150.978895] hub 1-1.2.3:1.0: USB hub found
[ 150.979240] hub 1-1.2.3:1.0: 4 ports detected
[ 151.197657] usb 1-1.2.4: new high-speed USB device number 8 using ehci-pci
[ 151.311257] usb 1-1.2.4: New USB device found, idVendor=17e9, idProduct=01e0
[ 151.311265] usb 1-1.2.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 151.311268] usb 1-1.2.4: Product: Lenovo Enhanced USB Port Replicator
[ 151.311271] usb 1-1.2.4: Manufacturer: DisplayLink
[ 151.311274] usb 1-1.2.4: SerialNumber: 01>0-147825
[ 151.355318] [drm] vendor descriptor length:e0 data:00 00 00 00 00 00 00 00 00 00 00
[ 151.355330] [drm:udl_driver_load [udl]] *ERROR* Unrecognized vendor firmware descriptor
[ 151.463148] udl 1-1.2.4:1.1: fb1: udldrmfb frame buffer device
[ 151.463154] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 151.463156] [drm] No driver support for vblank timestamp query.
[ 151.463158] [drm] Initialized udl on minor 1
[ 151.463201] usbcore: registered new interface driver udl
lsusb：
Bus 002 Device 003: ID 17ef:6019 Lenovo
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 04f2:b2da Chicony Electronics Co., Ltd thinkpad t430s camera
Bus 001 Device 003: ID 147e:2020 Upek TouchChip Fingerprint Coprocessor (WBF advanced mode)
Bus 001 Device 008: ID 17e9:01e0 DisplayLink
Bus 001 Device 007: ID 0409:005a NEC Corp. HighSpeed Hub
Bus 001 Device 006: ID 0d8c:0105 C-Media Electronics, Inc. CM108 Audio Controller
Bus 001 Device 005: ID 0409:005a NEC Corp. HighSpeed Hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
lsusb-v-d 17e9：01e0
Bus 001 Device 008: ID 17e9:01e0 DisplayLink
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x17e9 DisplayLink
idProduct 0x01e0
bcdDevice 0.03
iManufacturer 1 DisplayLink
iProduct 2 Lenovo Enhanced USB Port Replicator
iSerial 3 01>0-147825
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 48
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 1 DisplayLink
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 4
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0004 1x 4 bytes
bInterval 10
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0001
Self Powered