机器： Lenovo ThinkPad S440 (2014年出厂），也叫ThinkPad S3。
操作系统：原装Windows 7，改装成Linux Mint 19、Manjaro，内核5.x
相关硬件：Intel Wireless-N 2230无线网卡
问题：
在每次冷启动后，network manager会有1/3的概率显示没有无线网卡。用lspci也看不到该无线网卡。dmesg里看不到有error消息。
如果冷启动后显示有无线网卡，则无线网卡使用一切正常。
在改装成Linux之前，Windows 7下使用完全正常，从没出现过无线网卡以概率失踪的情况。
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$ uname -a
Linux ThinkPad-S3 5.0.0-32-generic #34~18.04.2-Ubuntu SMP Thu Oct 10 10:36:02 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
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$lspci
03:00.0 Network controller: Intel Corporation Centrino Wireless-N 2230 (rev c4)
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$ modinfo iwlwifi
filename: /lib/modules/5.0.0-32-generic/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko
license: GPL
author: Copyright(c) 2003- 2015 Intel Corporation
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-8265-36.ucode
firmware: iwlwifi-8000C-36.ucode
firmware: iwlwifi-9260-th-b0-jf-b0-43.ucode
firmware: iwlwifi-9260-th-a0-jf-a0-43.ucode
firmware: iwlwifi-9000-pu-a0-jf-b0-43.ucode
firmware: iwlwifi-9000-pu-b0-jf-b0-43.ucode
firmware: iwlwifi-9000-pu-a0-jf-a0-43.ucode
firmware: iwlwifi-Qu-b0-jf-b0-43.ucode
firmware: iwlwifi-su-z0-43.ucode
firmware: iwlwifi-QuQnj-a0-hr-a0-43.ucode
firmware: iwlwifi-QuQnj-a0-jf-b0-43.ucode
firmware: iwlwifi-QuQnj-b0-hr-b0-43.ucode
firmware: iwlwifi-Qu-b0-hr-b0-43.ucode
firmware: iwlwifi-QuQnj-f0-hr-a0-43.ucode
firmware: iwlwifi-Qu-a0-jf-b0-43.ucode
firmware: iwlwifi-Qu-a0-hr-a0-43.ucode
srcversion: 73136E4A47DE531CDC14864
depends: cfg80211
retpoline: Y
intree: Y
name: iwlwifi
vermagic: 5.0.0-32-generic SMP mod_unload
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, 2K for 22560 devices, 4K for other devices 1:4K 2:8K 3:12K 4: 2K (`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: enable_ini:Enable debug INI TLV FW debug infrastructure (`default`: 0 (bool)
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)
parm: remove_when_gone:Remove dev from PCIe bus if it is deemed inaccessible (`default`: false) (bool)
parm: disable_11ax:Disable HE capabilities (`default`: false) (bool)
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