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无线连接不良 Ubuntu 20.04（双启动）

tag-icon • tag-icon networking wireless 20.04 iwlwifi
无线连接不良 Ubuntu 20.04（双启动）

在我的笔记本电脑上，我安装了 Windows 10 和 Ubunti 20.04 双启动系统。我的 Windows 上的 wifi 网速明显快于 Ubuntu（220 Mbit/s vs 20 Mbit/s），我似乎不知道为什么。有线连接时没有问题。

我浏览过多个类似的帖子/博客，并在此基础上尝试了以下操作：

  1. 设定wifi.powersave = 2为etc/NetworkManager/conf.d/default-wifi-powersave-on.conf。
  2. 已经使用过sudo modprobe iwlwifi 11n_disable=1（并且尝试过=10）。
  3. 设置hosts: files dns​ /etc/nsswitch.conf
  4. 尝试卸载backport-iwlwifi-dkms（但未安装）
  5. 尝试iwlwifi手动下载（但文件已存在于/lib/firmware.
  6. 尝试iwldvm通过sudo modprobe -rv iwldvm和卸载并重新安装sudo modprobe iwldvm。

但似乎没有一个能带来改善。有人知道下一步该去哪里以及该尝试什么吗？因为我没有主意了。

更多信息：sudo lshw -class network -short && nmcli device status当仅连接 wifi 时，提供：

======================================================
/0/100/19        enp0s25    network        82579LM Gigabit Network Connection (L
/0/100/1c.3/0    wlo1       network        Centrino Ultimate-N 6300
DEVICE   TYPE      STATE        CONNECTION 
wlo1     wifi      connected    Linksys100 
enp0s25  ethernet  unavailable  --         
lo       loopback  unmanaged    --

并lspci -nnk | grep 0280 -A3给出：

25:00.0 Network controller [0280]: Intel Corporation Centrino Ultimate-N 6300 [8086:422b] (rev 3e)
    DeviceName: WLAN
    Subsystem: Intel Corporation Centrino Ultimate-N 6300 3x3 AGN [8086:1101]
    Kernel driver in use: iwlwifi

rfkill list all给出：

1: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
2: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no

dmesg | grep iwl给出

[   22.370678] iwlwifi 0000:25:00.0: enabling device (0000 -> 0002)
[   22.370841] iwlwifi 0000:25:00.0: can't disable ASPM; OS doesn't have ASPM control
[   22.493735] iwlwifi 0000:25:00.0: Direct firmware load for iwlwifi-6000-6.ucode failed with error -2
[   22.493757] iwlwifi 0000:25:00.0: Direct firmware load for iwlwifi-6000-5.ucode failed with error -2
[   22.533588] iwlwifi 0000:25:00.0: loaded firmware version 9.221.4.1 build 25532 op_mode iwldvm
[   23.202028] iwlwifi 0000:25:00.0: CONFIG_IWLWIFI_DEBUG disabled
[   23.202036] iwlwifi 0000:25:00.0: CONFIG_IWLWIFI_DEBUGFS enabled
[   23.202037] iwlwifi 0000:25:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled
[   23.202039] iwlwifi 0000:25:00.0: Detected Intel(R) Centrino(R) Ultimate-N 6300 AGN, REV=0x74
[   23.246237] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs'
[   26.247797] iwlwifi 0000:25:00.0 wlo1: renamed from wlan0
[  119.101220] iwlwifi 0000:25:00.0: Radio type=0x0-0x3-0x1
[  119.393473] iwlwifi 0000:25:00.0: Radio type=0x0-0x3-0x1
[  269.382438] iwlwifi 0000:25:00.0: can't disable ASPM; OS doesn't have ASPM control
[  269.382946] iwlwifi 0000:25:00.0: Direct firmware load for iwlwifi-6000-6.ucode failed with error -2
[  269.382956] iwlwifi 0000:25:00.0: Direct firmware load for iwlwifi-6000-5.ucode failed with error -2
[  269.383166] iwlwifi 0000:25:00.0: loaded firmware version 9.221.4.1 build 25532 op_mode iwldvm
[  269.405281] iwlwifi 0000:25:00.0: CONFIG_IWLWIFI_DEBUG disabled
[  269.405283] iwlwifi 0000:25:00.0: CONFIG_IWLWIFI_DEBUGFS enabled
[  269.405284] iwlwifi 0000:25:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled
[  269.405285] iwlwifi 0000:25:00.0: Detected Intel(R) Centrino(R) Ultimate-N 6300 AGN, REV=0x74
[  269.441553] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs'
[  269.545729] iwlwifi 0000:25:00.0 wlo1: renamed from wlan0
[  279.500566] iwlwifi 0000:25:00.0: Radio type=0x0-0x3-0x1
[  279.750440] iwlwifi 0000:25:00.0: Radio type=0x0-0x3-0x1
[  279.894389] iwlwifi 0000:25:00.0: Radio type=0x0-0x3-0x1
[  280.146902] iwlwifi 0000:25:00.0: Radio type=0x0-0x3-0x1

作为旁节点，我最近从 18.04 升级到了 20.04。但是，我之前也遇到过类似的问题。还应该注意的是，这个网络是一个网状网络，但（从心里来说）我不记得它在其他网络上运行得更好。

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