有些东西不断改变我的无线监管领域

Question

我有一台 Thinkpad T450s 和 KXStudio (Ubuntu+KDE) 我的连接经常掉线，我认为问题与频繁的 CRDA 调用有关。我住在德国，但出于某种原因，我的电脑似乎真的很喜欢美国（或者更确切地说是国际前缀 00）！

这是一个典型的输出dmesg：

[  404.422554] wlan0: deauthenticated from 78:8d:f7:28:5b:48 (Reason: 6)
[  404.433563] cfg80211: Calling CRDA to update world regulatory domain
[  404.435411] cfg80211: World regulatory domain updated:
[  404.435413] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[  404.435415] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[  404.435416] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[  404.435417] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[  404.435418] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[  404.435419] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[  404.435429] cfg80211: Calling CRDA for country: DE
[  404.437056] cfg80211: Regulatory domain changed to country: DE
[  404.437060] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[  404.437062] cfg80211:   (2400000 KHz - 2483500 KHz @ 40000 KHz), (N/A, 2000 mBm)
[  404.437064] cfg80211:   (5150000 KHz - 5250000 KHz @ 40000 KHz), (N/A, 2000 mBm)
[  404.437066] cfg80211:   (5250000 KHz - 5350000 KHz @ 40000 KHz), (N/A, 2000 mBm)
[  404.437068] cfg80211:   (5470000 KHz - 5725000 KHz @ 40000 KHz), (N/A, 2698 mBm)
[  404.437069] cfg80211:   (57240000 KHz - 65880000 KHz @ 2160000 KHz), (N/A, 4000 mBm)
[  414.946644] wlan0: authenticate with 78:8d:f7:28:5b:48
[  414.950643] wlan0: send auth to 78:8d:f7:28:5b:48 (try 1/3)
[  415.059726] wlan0: send auth to 78:8d:f7:28:5b:48 (try 2/3)
[  415.065667] wlan0: authenticated
[  415.066268] wlan0: associate with 78:8d:f7:28:5b:48 (try 1/3)
[  415.089862] wlan0: RX AssocResp from 78:8d:f7:28:5b:48 (capab=0xc11 status=0 aid=2)
[  415.105275] wlan0: associated
[  415.105430] cfg80211: Calling CRDA for country: US
[  415.110984] cfg80211: Regulatory domain changed to country: US
[  415.110992] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[  415.110996] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2700 mBm)
[  415.111000] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 1700 mBm)
[  415.111004] cfg80211:   (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[  415.111007] cfg80211:   (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[  415.111010] cfg80211:   (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[  415.111013] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 3000 mBm)
[  415.111016] cfg80211:   (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 4000 mBm)
[  419.277506] wlan0: deauthenticating from 78:8d:f7:28:5b:48 by local choice (reason=3)
[  419.281900] cfg80211: Calling CRDA to update world regulatory domain
[  419.285000] cfg80211: World regulatory domain updated:
[  419.285003] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[  419.285005] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[  419.285007] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[  419.285008] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[  419.285010] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[  419.285011] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[  419.285024] cfg80211: Calling CRDA for country: DE
[  419.287014] cfg80211: Regulatory domain changed to country: DE
[  419.287017] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[  419.287018] cfg80211:   (2400000 KHz - 2483500 KHz @ 40000 KHz), (N/A, 2000 mBm)
[  419.287019] cfg80211:   (5150000 KHz - 5250000 KHz @ 40000 KHz), (N/A, 2000 mBm)
[  419.287020] cfg80211:   (5250000 KHz - 5350000 KHz @ 40000 KHz), (N/A, 2000 mBm)
[  419.287020] cfg80211:   (5470000 KHz - 5725000 KHz @ 40000 KHz), (N/A, 2698 mBm)
[  419.287021] cfg80211:   (57240000 KHz - 65880000 KHz @ 2160000 KHz), (N/A, 4000 mBm)

这是一个典型的输出udevadm monitor --environment kernel：

KERNEL[316.218832] change   /devices/platform/regulatory.0 (platform)
ACTION=change
COUNTRY=DE
DEVPATH=/devices/platform/regulatory.0
MODALIAS=platform:regulatory
SEQNUM=2334
SUBSYSTEM=platform

UDEV  [316.219479] change   /devices/platform/regulatory.0 (platform)
ACTION=change
COUNTRY=00
DEVPATH=/devices/platform/regulatory.0
MODALIAS=platform:regulatory
SEQNUM=2333
SUBSYSTEM=platform
USEC_INITIALIZED=6216391

UDEV  [316.221855] change   /devices/platform/regulatory.0 (platform)
ACTION=change
COUNTRY=DE
DEVPATH=/devices/platform/regulatory.0
MODALIAS=platform:regulatory
SEQNUM=2334
SUBSYSTEM=platform
USEC_INITIALIZED=18676

KERNEL[319.092483] change   /devices/platform/regulatory.0 (platform)
ACTION=change
COUNTRY=US
DEVPATH=/devices/platform/regulatory.0
MODALIAS=platform:regulatory
SEQNUM=2335
SUBSYSTEM=platform

UDEV  [319.096341] change   /devices/platform/regulatory.0 (platform)
ACTION=change
COUNTRY=US
DEVPATH=/devices/platform/regulatory.0
MODALIAS=platform:regulatory
SEQNUM=2335
SUBSYSTEM=platform
USEC_INITIALIZED=92541

我已经在/etc/default/crda国家 DE设置，但crda返回：

COUNTRY environment variable not set.

如果我跑export COUNTRY=DE，crda我得到：

Failed to set regulatory domain: -28

但问题是（我认为）其他问题：为什么 CRDA 经常被调用？通过什么方式？为什么它被称为美国？

Answer 1

我相信至少有三件事会影响 CRDA。首先，正如您已经知道的，在您的情况下，文件 /etc/default/crda 应该有一个未注释的行：

REGDOMAIN=DE

其次，是模块 cfg80211 在dmesg 中抱怨；让我们尝试修复它：

sudo -i
echo "options cfg80211 ieee80211_regdom=DE"  >  /etc/modprobe.d/cfg80211.conf
exit

最后，由于您的无线接口是“管理的”，即由路由器管理的信道、比特率等，我强烈怀疑如果路由器或更特别是它的固件是为在美国使用而构建的，路由器设置了一个 CRDA，只允许使用某些通道。我建议您从路由器制造商的德国网站或至少欧洲网站更新固件，看看是否有帮助。重启路由器。

重新启动并查看连接性是否有所改善。CRDA 只是我为帮助像您这样的问题而提出的一项建议。如果您的问题没有解决，我很乐意继续。

编辑：我遇到了这个，这可能会有所帮助：https : //bbs.archlinux.org/viewtopic.php?id=124574

此外，在我自己的情况下，在 USB 无线网络中，所有覆盖 CRDA 的尝试都失败了。国家代码显然是硬编码在设备 ROM 中的。我可以连接的唯一方法是在dmesg 中检查：

cfg80211: Calling CRDA for country: CN

然后设置相同的区域：

sudo iw reg set CN

USB 立即连接。