我有带有低延迟内核的 Ubuntu 16.04.3，运行 KDE plasma。
每次启动时，即使未连接，以太网也始终处于开启状态；WiFi 有时处于开启状态。
我必须禁用幻象以太网连接才能使 Wi-Fi 正常工作！
我的 Dell Inspirion 1525 笔记本电脑使用博通 wifi。我使用 Ask 的安装说明将特定的博通设备驱动程序放入低延迟内核中。在此之前没有 wifi，只有以太网（无论是否有线连接）。现在我可以使用以太网（无论是否有线连接）和 wifi。
在启动时，我使用小部件显示网络连接，然后关闭enp9s0（它显示有线连接列为ifupdown（它显示了我几个月前安装的enp9s0在没有实际有线连接的情况下启动或关闭。ifupdown自动识别有线连接是否已插入笔记本电脑，我以为它会在启动时“知道”实际连接到以太网的是什么。但事实并非如此。
我的/etc/网络/接口文件是：
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
#--- enp9s0 ---was eth0------
allow-hotplug enp9s0
iface enp9s0 inet static
address 192.168.99.10
netmask 255.255.255.0
gateway 192.168.99.1
#--- wlp12s0 ---was wlan0------
auto wlp12s0
iface wlp12s0 inet static
address 192.168.99.11
netmask 255.255.255.0
gateway 192.168.99.1
wpa-ssid Disco
wpa-psk pre-shared-key
接口文件用于 IP 地址，因此问题可能出在这里，但我不知道什么才是正确的。
================================
cat /etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=true
==========================
lspci
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
00:1a.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03)
00:1a.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03)
00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 (rev 03)
00:1c.4 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5 (rev 03)
00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03)
00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E) 4 port SATA Controller [AHCI mode] (rev 03)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
09:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8040 PCI-E Fast Ethernet Controller (rev 13)
0c:00.0 Network controller: Broadcom Limited BCM4312 802.11b/g LP-PHY (rev 01)