我尝试创建ap，发现ubuntu22只能创建2.4GHZ热点，与相同硬件的windows可以创建5GHZ热点不同。（我刚刚在同一台笔记本电脑上将windows10替换为ubuntu22）
在 ubuntu22 上，我收到这样的错误：
ERROR: Your adapter can not transmit to channel 36, frequency band 5GHz.
iw 列表显示
.......
Frequencies:
* 5180 MHz [36] (22.0 dBm) (no IR)
* 5200 MHz [40] (22.0 dBm) (no IR)
* 5220 MHz [44] (22.0 dBm) (no IR)
* 5240 MHz [48] (22.0 dBm) (no IR)
* 5260 MHz [52] (22.0 dBm) (no IR, radar detection)
* 5280 MHz [56] (22.0 dBm) (no IR, radar detection)
* 5300 MHz [60] (22.0 dBm) (no IR, radar detection)
* 5320 MHz [64] (22.0 dBm) (no IR, radar detection)
* 5340 MHz [68] (disabled)
* 5360 MHz [72] (disabled)
* 5380 MHz [76] (disabled)
* 5400 MHz [80] (disabled)
* 5420 MHz [84] (disabled)
* 5440 MHz [88] (disabled)
* 5460 MHz [92] (disabled)
* 5480 MHz [96] (disabled)
* 5500 MHz [100] (22.0 dBm) (no IR, radar detection)
* 5520 MHz [104] (22.0 dBm) (no IR, radar detection)
* 5540 MHz [108] (22.0 dBm) (no IR, radar detection)
* 5560 MHz [112] (22.0 dBm) (no IR, radar detection)
* 5580 MHz [116] (22.0 dBm) (no IR, radar detection)
* 5600 MHz [120] (22.0 dBm) (no IR, radar detection)
* 5620 MHz [124] (22.0 dBm) (no IR, radar detection)
* 5640 MHz [128] (22.0 dBm) (no IR, radar detection)
* 5660 MHz [132] (22.0 dBm) (no IR, radar detection)
* 5680 MHz [136] (22.0 dBm) (no IR, radar detection)
* 5700 MHz [140] (22.0 dBm) (no IR, radar detection)
* 5720 MHz [144] (22.0 dBm) (no IR, radar detection)
* 5745 MHz [149] (22.0 dBm) (no IR)
* 5765 MHz [153] (22.0 dBm) (no IR)
* 5785 MHz [157] (22.0 dBm) (no IR)
* 5805 MHz [161] (22.0 dBm) (no IR)
* 5825 MHz [165] (22.0 dBm) (no IR)
* 5845 MHz [169] (disabled)
* 5865 MHz [173] (disabled)
* 5885 MHz [177] (disabled)
* 5905 MHz [181] (disabled)
.......
没有 IR 意味着我无法使用频率创建 AP。这与世界监管领域有关。请参阅https://superuser.com/questions/809282/wifi-5ghz-ap-mode-what-does-no-ir-means-and-can-i-bypass-it。
因此我尝试sudo iw reg set CN，因为网络控制器有一个物理管理的监管域 CN。
➜ ~ iw reg get
global
country CN: DFS-FCC
(2400 - 2483 @ 40), (N/A, 20), (N/A)
(5150 - 5350 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW
(5725 - 5850 @ 80), (N/A, 33), (N/A)
(57240 - 59400 @ 2160), (N/A, 28), (N/A)
(59400 - 63720 @ 2160), (N/A, 44), (N/A)
(63720 - 65880 @ 2160), (N/A, 28), (N/A)
phy#0 (self-managed)
country CN: DFS-UNSET
(2402 - 2437 @ 40), (6, 22), (N/A), AUTO-BW, NO-HT40MINUS, NO-80MHZ, NO-160MHZ
(2422 - 2462 @ 40), (6, 22), (N/A), AUTO-BW, NO-80MHZ, NO-160MHZ
(2447 - 2482 @ 40), (6, 22), (N/A), AUTO-BW, NO-HT40PLUS, NO-80MHZ, NO-160MHZ
(5170 - 5190 @ 160), (6, 22), (N/A), NO-OUTDOOR, AUTO-BW, IR-CONCURRENT, NO-HT40MINUS, PASSIVE-SCAN
(5190 - 5210 @ 160), (6, 22), (N/A), NO-OUTDOOR, AUTO-BW, IR-CONCURRENT, NO-HT40PLUS, PASSIVE-SCAN
(5210 - 5230 @ 160), (6, 22), (N/A), NO-OUTDOOR, AUTO-BW, IR-CONCURRENT, NO-HT40MINUS, PASSIVE-SCAN
(5230 - 5250 @ 160), (6, 22), (N/A), NO-OUTDOOR, AUTO-BW, IR-CONCURRENT, NO-HT40PLUS, PASSIVE-SCAN
(5250 - 5270 @ 160), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, PASSIVE-SCAN
(5270 - 5290 @ 160), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, PASSIVE-SCAN
(5290 - 5310 @ 160), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, PASSIVE-SCAN
(5310 - 5330 @ 160), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, PASSIVE-SCAN
(5490 - 5510 @ 240), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, PASSIVE-SCAN
(5510 - 5530 @ 240), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, PASSIVE-SCAN
(5530 - 5550 @ 240), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, PASSIVE-SCAN
(5550 - 5570 @ 240), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, PASSIVE-SCAN
(5570 - 5590 @ 240), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, PASSIVE-SCAN
(5590 - 5610 @ 240), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, PASSIVE-SCAN
(5610 - 5630 @ 240), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, PASSIVE-SCAN
(5630 - 5650 @ 240), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, PASSIVE-SCAN
(5650 - 5670 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
(5670 - 5690 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, NO-160MHZ, PASSIVE-SCAN
(5690 - 5710 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
(5710 - 5730 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, NO-160MHZ, PASSIVE-SCAN
(5735 - 5755 @ 80), (6, 22), (N/A), AUTO-BW, IR-CONCURRENT, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
(5755 - 5775 @ 80), (6, 22), (N/A), AUTO-BW, IR-CONCURRENT, NO-HT40PLUS, NO-160MHZ, PASSIVE-SCAN
(5775 - 5795 @ 80), (6, 22), (N/A), AUTO-BW, IR-CONCURRENT, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
(5795 - 5815 @ 80), (6, 22), (N/A), AUTO-BW, IR-CONCURRENT, NO-HT40PLUS, NO-160MHZ, PASSIVE-SCAN
(5815 - 5835 @ 20), (6, 22), (N/A), AUTO-BW, IR-CONCURRENT, NO-HT40MINUS, NO-HT40PLUS, NO-80MHZ, NO-160MHZ, PASSIVE-SCAN
在 CN 中，允许使用某些 5G 带宽创建 AP，但我收到相同的错误。iw list
iw phy所有启用的带宽仍然显示“无 IR”。
有人说 crda 解决了这个问题，但是它从 ubuntu22 开始就被删除了。
有人说英特尔在某些监管领域物理阻止了红外线。但我可以在 Windows 上使用此卡创建 5G 热点，所以这应该不是硬件问题。 https://community.intel.com/t5/Wireless/Intel-AX200-as-AP-in-Ubuntu-20-04-hostapd/mp/1307813
一些通过编译路径内核来绕过 IR。 https://medium.com/@renaudcerrato/how-to-build-your-own-wireless-router-from-scratch-part-3-d54eecce157f 我的内核是6.2.0，我编译了一个修补的6.2.1内核，但是失败了。iw list 仍然显示没有IR，而且我无法创建5G AP。
这是编译配置。我已将 regd.c 路径化并启用了该配置。
│ Symbol: ATH_USER_REGD [=y] │
│ Type : bool │
│ Defined at drivers/net/wireless/ath/Kconfig:26 │
│ Prompt: Do not enforce EEPROM regulatory restrictions │
│ Depends on: NETDEVICES [=y] && WLAN [=y] && WLAN_VENDOR_ATH [=y] │
│ Location: │
│ -> Device Drivers │
│ -> Network device support (NETDEVICES [=y]) │
│ -> Wireless LAN (WLAN [=y]) │
│ -> Atheros/Qualcomm devices (WLAN_VENDOR_ATH [=y]) │
│ (1) -> Do not enforce EEPROM regulatory restrictions (ATH_USER_REGD [=y])
有人说 ubuntu 更新了检查监管域的方式，旧的网络控制器不兼容。所以我必须购买更新的网卡来创建 5G AP。但显然，我不想再买一个。
无法在 ubuntu 22.04.1 上创建 5Ghz wifi 热点
所以我的问题是，如何在 ubuntu22 上使用此卡创建 5G AP？
更多信息：
网络控制器：英特尔公司 Wireless-AC 9260。
*-network
description: Wireless interface
product: Wireless-AC 9260
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlp3s0
version: 29
serial: 18:56:80:b5:f7:20
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=6.2.1 firmware=46.fae53a8b.0 9260-th-b0-jf-b0- ip=10.42.0.1 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:17 memory:a5200000-a5203fff
使用创建热点https://github.com/lakinduakash/linux-wifi-hotspot，它使用了create_ap。Ubuntu
系统wifi热点默认为2.4GHz，无法更改。