Intel AX201 is not using 2 spatial streams in the RX (download) direction. TX (upload) functions as expected. Firmware revision: 67.8f59b80b.0 QuZ-a0-hr-b0-67.ucode Additional information: Testing using iperf3 in one direction, and then the other, RX will stay at MCS8 / MCS9 with SGI, but it will never enable a second spatial stream. TX uses MCS8 / MCS9 with SGI but with the second spatial stream. Signal as shown by `iw dev show` hovers between -53 and -56 dBm. Access point reports the same. The same laptop, in the same location, using Windows, will use 2 spatial streams in both directions as expected. An Intel AX200 adapter is displaying similar behavior, but the system does not boot Windows so I am unable to verify if it functions correctly using Windows. Network is configured to use a 40 MHz channel width.
I see the same behavior on two different systems. Machine 1: Fedora 35 (5.15.12-200.fc35.x86_64) Intel AX200 (rev 1a) Firmware Version: 63.c04f3485.0 cc-a0-63.ucode Machine 2: Fedora 35 Silverblue (5.15.8-200.fc35.x86_64) Intel AC 7265 Firmware Version: 29.4063824552 7265D-29.ucode My network is configured to use 80MHz channel widths.
I should mention my tests were with 802.11ac, 5 GHz.
(In reply to Mike Banducci from comment #1) > I see the same behavior on two different systems. > > Machine 1: > Fedora 35 (5.15.12-200.fc35.x86_64) > Intel AX200 (rev 1a) > Firmware Version: 63.c04f3485.0 cc-a0-63.ucode > > Machine 2: > Fedora 35 Silverblue (5.15.8-200.fc35.x86_64) > Intel AC 7265 > Firmware Version: 29.4063824552 7265D-29.ucode > > > My network is configured to use 80MHz channel widths. Forgot I have a desktop with yet another Intel Wireless NIC, same issue: Fedora 35 (5.15.12-200.fc35.x86_64) Intel AC 8260 Firmware Version: 36.ca7b901d.0 8000C-36.ucode
Can confirm this, using an AX210 and UniFi WiFi 6 Lite AP. I'm down from 700 Mbit/s to like 250 Mbit/s. I don't know when it regressed, though. I disconnected each antenna, and speed with one antenna was always the same 250 Mbit/s, so at least the antennas are working fine. Whether that's Ubuntu's 5.15 kernel or directly backported iwlwifi modules with 71 firmware.
Can confirm with AX210 and Aruba 630 AP under Kernel 5.17. Only in TX Channel 2 Spatial Streams are possible, in RX only one.
(In reply to pkalytta from comment #5) > Can confirm with AX210 and Aruba 630 AP under Kernel 5.17. > Only in TX Channel 2 Spatial Streams are possible, in RX only one. Tested this with 802.11ax: In 5 GHz, 2 SS are used in both directions, only in 6 GHz operation, there is only one RX stream on the client AX210 Best regards, Philipp
I only have 5 GHz and suffer from the same bug, this is not a 6 GHz only bug; the AX201 in the bug report doesn't even have 6 GHz support.
For the 6E / 6 GHz case, the mailing list post for this bug[0] has a proposed patch[1]. [0] - https://lore.kernel.org/linux-wireless/679864d0-25da-b3c7-b1da-c77deb52fd3a@candelatech.com/ [1] - https://patchwork.kernel.org/project/linux-wireless/patch/20220113011646.38569-1-chuck.smileyrekiere@candelatech.com/
AFAICT, this is resolved on my system with backport-iwlwifi version 9858 commit d0c7cb83a3772e, and firmware 73 Jun 27 23:18:30 jak-t480s kernel: iwlwifi 0000:3d:00.0: TLV_FW_FSEQ_VERSION: FSEQ Version: 0.0.2.36 Jun 27 23:18:30 jak-t480s kernel: iwlwifi 0000:3d:00.0: loaded firmware version 73.35c0a2c6.0 ty-a0-gf-a0-73.ucode op_mode iwlmvm Jun 27 23:18:30 jak-t480s kernel: iwlwifi 0000:3d:00.0: Detected Intel(R) Wi-Fi 6 AX210 160MHz, REV=0x420 Jun 27 23:18:30 jak-t480s kernel: iwlwifi 0000:3d:00.0: loaded PNVM version 881c99e1 I can achieve up to 700 Mbit/s again.
I guess this looks good: jak@jak-t480s:~:master$ sudo iw wlan0 link Connected to 7a:45:58:16:13:da (on wlan0) SSID: JNet freq: 5200 RX: 1737360252 bytes (1133077 packets) TX: 9957461 bytes (107091 packets) signal: -55 dBm rx bitrate: (unknown) 80MHz tx bitrate: 1200.9 MBit/s 80MHz HE-MCS 11 HE-NSS 2 HE-GI 0 HE-DCM 0 bss flags: short-slot-time dtim period: 3 beacon int: 100 Can't speak for upstream kernels state vs backport-iwlwifi