我家里有两台笔记本电脑——一台 MacBook Pro 和一台装有 Ubuntu 18.04.5 的戴尔 XPS 15。
两者都相邻，连接到我的家庭网络。
MacBook Pro 的速度测试结果：
Retrieving speedtest.net configuration...
Testing from XFone 018 (141.xxx.xx.235)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Partner Communications (Tel Aviv) [1.73 km]: 19.941 ms
Testing download speed................................................................................
Download: 57.03 Mbit/s
Testing upload speed......................................................................................................
Upload: 2.59 Mbit/s
戴尔 XPS 15 / Ubuntu 18.04.5 速度测试结果：
Retrieving speedtest.net configuration...
Testing from XFone 018 (141.xxx.xx.235)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Partner Communications (Tel Aviv) [1.73 km]: 23.252 ms
Testing download speed................................................................................
Download: 0.22 Mbit/s
Testing upload speed......................................................................................................
Upload: 0.15 Mbit/s
无线硬件：
Network: Card: Intel Wireless-AC 9260 driver: iwlwifi bus-ID: 02:00.0
IF: wlp2s0 state: up mac: <filter>
$ lspci -v
...
02:00.0 Network controller: Intel Corporation Wireless-AC 9260 (rev 29)
Subsystem: Intel Corporation Device 0014
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at edc00000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
$ iwconfig
virbr0 no wireless extensions.
docker0 no wireless extensions.
vethba1d543 no wireless extensions.
wlp2s0 IEEE 802.11 ESSID:"spongebob"
Mode:Managed Frequency:5.18 GHz Access Point: AC:84:C6:46:43:6B
Bit Rate=866.7 Mb/s Tx-Power=22 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=70/70 Signal level=-16 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:231 Missed beacon:0
vethaea3bba no wireless extensions.
virbr0-nic no wireless extensions.
br-fc08e482f3d3 no wireless extensions.
virbr1 no wireless extensions.
virbr1-nic no wireless extensions.
lo no wireless extensions.
br-b1fc08b5672f no wireless extensions.
br-69d310606872 no wireless extensions.
$ modinfo iwlwifi
filename: /lib/modules/4.15.0-153-generic/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko
license: GPL
author: Copyright(c) 2003- 2015 Intel Corporation <[email protected]>
description: Intel(R) Wireless WiFi driver for Linux
firmware: iwlwifi-100-5.ucode
firmware: iwlwifi-1000-5.ucode
firmware: iwlwifi-135-6.ucode
firmware: iwlwifi-105-6.ucode
firmware: iwlwifi-2030-6.ucode
firmware: iwlwifi-2000-6.ucode
firmware: iwlwifi-5150-2.ucode
firmware: iwlwifi-5000-5.ucode
firmware: iwlwifi-6000g2b-6.ucode
firmware: iwlwifi-6000g2a-6.ucode
firmware: iwlwifi-6050-5.ucode
firmware: iwlwifi-6000-6.ucode
firmware: iwlwifi-7265D-29.ucode
firmware: iwlwifi-7265-17.ucode
firmware: iwlwifi-3168-29.ucode
firmware: iwlwifi-3160-17.ucode
firmware: iwlwifi-7260-17.ucode
firmware: iwlwifi-8265-34.ucode
firmware: iwlwifi-8000C-34.ucode
firmware: iwlwifi-9260-th-b0-jf-b0-34.ucode
firmware: iwlwifi-9260-th-a0-jf-a0-34.ucode
firmware: iwlwifi-9000-pu-a0-jf-b0-34.ucode
firmware: iwlwifi-9000-pu-b0-jf-b0-34.ucode
firmware: iwlwifi-9000-pu-a0-jf-a0-34.ucode
firmware: iwlwifi-QuQnj-a0-hr-a0-34.ucode
firmware: iwlwifi-QuQnj-a0-jf-b0-34.ucode
firmware: iwlwifi-QuQnj-f0-hr-a0-34.ucode
firmware: iwlwifi-Qu-a0-jf-b0-34.ucode
firmware: iwlwifi-Qu-a0-hr-a0-34.ucode
srcversion: 578432A6FC6B903815C7082
alias: pci:v00008086d0000A0F0sv*sd00000000bc*sc*i*
...
depends: cfg80211
retpoline: Y
intree: Y
name: iwlwifi
vermagic: 4.15.0-153-generic SMP mod_unload modversions
signat: PKCS#7
signer:
sig_key:
sig_hashalgo: md4
parm: swcrypto:using crypto in software (default 0 [hardware]) (int)
parm: 11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm: amsdu_size:amsdu size 0: 12K for multi Rx queue devices, 4K for other devices 1:4K 2:8K 3:12K (default 0) (int)
parm: fw_restart:restart firmware in case of error (default true) (bool)
parm: antenna_coupling:specify antenna coupling in dB (default: 0 dB) (int)
parm: nvm_file:NVM file name (charp)
parm: d0i3_disable:disable d0i3 functionality (default: Y) (bool)
parm: lar_disable:disable LAR functionality (default: N) (bool)
parm: uapsd_disable:disable U-APSD functionality bitmap 1: BSS 2: P2P Client (default: 3) (uint)
parm: bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm: led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0) (int)
parm: power_save:enable WiFi power management (default: disable) (bool)
parm: power_level:default power save level (range from 1 - 5, default: 1) (int)
parm: fw_monitor:firmware monitor - to debug FW (default: false - needs lots of memory) (bool)
parm: d0i3_timeout:Timeout to D0i3 entry when idle (ms) (uint)
parm: disable_11ac:Disable VHT capabilities (default: false) (bool)
内核版本：
$ uname -r
4.15.0-153-generic
驱动程序：
$ sudo ls -l /lib/firmware/*9260*
-rw-r--r-- 1 root root 2637216 Apr 24 2018 /lib/firmware/iwlwifi-9260-th-b0-jf-b0-33.ucode
-rw-r--r-- 1 root root 2678092 Apr 14 2020 /lib/firmware/iwlwifi-9260-th-b0-jf-b0-34.ucode
-rw-r--r-- 1 root root 2521412 Mar 2 22:27 /lib/firmware/iwlwifi-9260-th-b0-jf-b0-38.ucode
-rw-r--r-- 1 root root 2620656 Apr 14 2020 /lib/firmware/iwlwifi-9260-th-b0-jf-b0-41.ucode
-rw-r--r-- 1 root root 2558176 Apr 14 2020 /lib/firmware/iwlwifi-9260-th-b0-jf-b0-43.ucode
-rw-r--r-- 1 root root 1463820 Mar 2 21:52 /lib/firmware/iwlwifi-9260-th-b0-jf-b0-46.ucode
$ lsmod | grep iwlwifi
iwlwifi 290816 1 iwlmvm
cfg80211 634880 3 iwlmvm,iwlwifi,mac80211
$ ubuntu-drivers devices
WARNING:root:_pkg_get_support nvidia-driver-390: package has invalid Support Legacyheader, cannot determine support level
== /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0 ==
modalias : pci:v00008086d00002526sv00008086sd00000014bc02sc80i00
vendor : Intel Corporation
manual_install: True
driver : backport-iwlwifi-dkms - distro free
我建议您尝试安装较新的 HWE 内核。这可以通过以下命令完成：（参考）
然后重新启动。这将安装具有更新驱动程序的内核版本 5.4。
您还可以考虑升级到 20.04 LTS，它支持更新的内核版本。我相信在一个不古老的内核上无论如何都会对你有所帮助。