rt2x00: 5Ghz signal power degradation with linux 5.2 kernel

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* rt2x00: 5Ghz signal power degradation with linux 5.2 kernel
       [not found] <CAJp6tx-L0Q4_OaUp+xMod0jsLjAByqnbrvk=JbEq5LOxTdhr_g@mail.gmail.com>
@ 2019-08-29  9:42 ` Sergey Maranchuk
  2019-08-29 10:03   ` Stanislaw Gruszka
  0 siblings, 1 reply; 3+ messages in thread
From: Sergey Maranchuk @ 2019-08-29  9:42 UTC (permalink / raw)
  To: linux-wireless

I got some problem after upgrade kernel to 5.2 version (debian testing
linux-image-5.2.0-2-amd64). 5Ghz client  stopped to see AP.
Some tests with 1metre distance between client-AP: 2.4Ghz  -22dBm, for
5Ghz - 53dBm !, for longer distance (8m + walls) 2.4 - 61dBm, 5Ghz not
visible.
All works fine with kernel 4.19 and on windows 10, other devices also
see AP without any problems with same distance.


Client Device - Alfa AWUS051NH

# lsmod |grep rt2
rt2800usb              28672  0
rt2x00usb              28672  1 rt2800usb
rt2800lib             135168  1 rt2800usb
rt2x00lib              69632  3 rt2800usb,rt2x00usb,rt2800lib
mac80211              868352  3 rt2x00lib,rt2x00usb,rt2800lib
cfg80211              819200  2 rt2x00lib,mac80211
crc_ccitt              16384  1 rt2800lib
usbcore               299008  9
xhci_hcd,rt2800usb,usbhid,xpad,usblp,usb_storage,xhci_pci,uas,rt2x00usb

# uname -a
Linux pc 5.2.0-2-amd64 #1 SMP Debian 5.2.9-2 (2019-08-21) x86_64 GNU/Linux

# modinfo rt2800usb
filename:
/lib/modules/5.2.0-2-amd64/kernel/drivers/net/wireless/ralink/rt2x00/rt2800usb.ko
license:        GPL
firmware:       rt2870.bin
description:    Ralink RT2800 USB Wireless LAN driver.
version:        2.3.0
author:         http://rt2x00.serialmonkey.com
srcversion:     554185273066F7CCC831E83
...


# dmesg|grep "rt2\|ieee8"
[    8.750465] ieee80211 phy0: rt2x00_set_rt: Info - RT chipset 2872,
rev 0202 detected
[    8.806271] ieee80211 phy0: rt2x00_set_rf: Info - RF chipset 0004 detected
[    8.822990] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[    8.823491] usbcore: registered new interface driver rt2800usb
[    8.829996] rt2800usb 3-3:1.0 wlx00c0ca32d4ad: renamed from wlan0
[   10.180340] ieee80211 phy0: rt2x00lib_request_firmware: Info -
Loading firmware file 'rt2870.bin'
[   10.181479] rt2800usb 3-3:1.0: firmware: direct-loading firmware rt2870.bin
[   10.181485] ieee80211 phy0: rt2x00lib_request_firmware: Info -
Firmware detected - version: 0.36

# lsusb
Bus 003 Device 005: ID 148f:2770 Ralink Technology, Corp. RT2770
Wireless Adapter

#  iw reg get
global
country UA: DFS-ETSI
(2400 - 2483 @ 40), (N/A, 20), (N/A), NO-OUTDOOR
(5150 - 5250 @ 80), (N/A, 20), (N/A), NO-OUTDOOR, AUTO-BW
(5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
(5490 - 5670 @ 160), (N/A, 20), (0 ms), DFS
(5735 - 5835 @ 80), (N/A, 20), (N/A)
(57000 - 66000 @ 2160), (N/A, 40), (N/A)

resetting to 00 didn't help

# iwlist wlx00c0ca32d4ad txpower
wlx00c0ca32d4ad  unknown transmit-power information.

          Current Tx-Power=20 dBm   (100 mW)

# iw list
Wiphy phy0
max # scan SSIDs: 4
max scan IEs length: 2257 bytes
max # sched scan SSIDs: 0
max # match sets: 0
max # scan plans: 1
max scan plan interval: -1
max scan plan iterations: 0
Retry short long limit: 2
Coverage class: 0 (up to 0m)
Device supports RSN-IBSS.
Supported Ciphers:
* WEP40 (00-0f-ac:1)
* WEP104 (00-0f-ac:5)
* TKIP (00-0f-ac:2)
* CCMP-128 (00-0f-ac:4)
* CCMP-256 (00-0f-ac:10)
* GCMP-128 (00-0f-ac:8)
* GCMP-256 (00-0f-ac:9)
Available Antennas: TX 0 RX 0
Supported interface modes:
* IBSS
* managed
* AP
* AP/VLAN
* monitor
* mesh point
Band 1:
Capabilities: 0x27e
HT20/HT40
SM Power Save disabled
RX Greenfield
RX HT20 SGI
RX HT40 SGI
RX STBC 2-streams
Max AMSDU length: 3839 bytes
No DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 2 usec (0x04)
HT RX MCS rate indexes supported: 0-15, 32
TX unequal modulation not supported
HT TX Max spatial streams: 1
HT TX MCS rate indexes supported may differ
Bitrates (non-HT):
* 1.0 Mbps
* 2.0 Mbps (short preamble supported)
* 5.5 Mbps (short preamble supported)
* 11.0 Mbps (short preamble supported)
* 6.0 Mbps
* 9.0 Mbps
* 12.0 Mbps
* 18.0 Mbps
* 24.0 Mbps
* 36.0 Mbps
* 48.0 Mbps
* 54.0 Mbps
Frequencies:
* 2412 MHz [1] (20.0 dBm)
* 2417 MHz [2] (20.0 dBm)
* 2422 MHz [3] (20.0 dBm)
* 2427 MHz [4] (20.0 dBm)
* 2432 MHz [5] (20.0 dBm)
* 2437 MHz [6] (20.0 dBm)
* 2442 MHz [7] (20.0 dBm)
* 2447 MHz [8] (20.0 dBm)
* 2452 MHz [9] (20.0 dBm)
* 2457 MHz [10] (20.0 dBm)
* 2462 MHz [11] (20.0 dBm)
* 2467 MHz [12] (20.0 dBm)
* 2472 MHz [13] (20.0 dBm)
* 2484 MHz [14] (disabled)
Band 2:
Capabilities: 0x27e
HT20/HT40
SM Power Save disabled
RX Greenfield
RX HT20 SGI
RX HT40 SGI
RX STBC 2-streams
Max AMSDU length: 3839 bytes
No DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 2 usec (0x04)
HT RX MCS rate indexes supported: 0-15, 32
TX unequal modulation not supported
HT TX Max spatial streams: 1
HT TX MCS rate indexes supported may differ
Bitrates (non-HT):
* 6.0 Mbps
* 9.0 Mbps
* 12.0 Mbps
* 18.0 Mbps
* 24.0 Mbps
* 36.0 Mbps
* 48.0 Mbps
* 54.0 Mbps
Frequencies:
* 5180 MHz [36] (20.0 dBm)
* 5190 MHz [38] (20.0 dBm)
* 5200 MHz [40] (20.0 dBm)
* 5220 MHz [44] (20.0 dBm)
* 5230 MHz [46] (20.0 dBm)
* 5240 MHz [48] (20.0 dBm)
* 5260 MHz [52] (20.0 dBm) (radar detection)
* 5270 MHz [54] (20.0 dBm) (radar detection)
* 5280 MHz [56] (20.0 dBm) (radar detection)
* 5300 MHz [60] (20.0 dBm) (radar detection)
* 5310 MHz [62] (20.0 dBm) (radar detection)
* 5320 MHz [64] (20.0 dBm) (radar detection)
* 5500 MHz [100] (20.0 dBm) (radar detection)
* 5510 MHz [102] (20.0 dBm) (radar detection)
* 5520 MHz [104] (20.0 dBm) (radar detection)
* 5540 MHz [108] (20.0 dBm) (radar detection)
* 5550 MHz [110] (20.0 dBm) (radar detection)
* 5560 MHz [112] (20.0 dBm) (radar detection)
* 5580 MHz [116] (20.0 dBm) (radar detection)
* 5590 MHz [118] (20.0 dBm) (radar detection)
* 5600 MHz [120] (20.0 dBm) (radar detection)
* 5620 MHz [124] (20.0 dBm) (radar detection)
* 5630 MHz [126] (20.0 dBm) (radar detection)
* 5640 MHz [128] (20.0 dBm) (radar detection)
* 5660 MHz [132] (20.0 dBm) (radar detection)
* 5670 MHz [134] (disabled)
* 5680 MHz [136] (disabled)
* 5700 MHz [140] (disabled)
* 5745 MHz [149] (20.0 dBm)
* 5755 MHz [151] (20.0 dBm)
* 5765 MHz [153] (20.0 dBm)
* 5785 MHz [157] (20.0 dBm)
* 5795 MHz [159] (20.0 dBm)
* 5805 MHz [161] (20.0 dBm)
* 5825 MHz [165] (20.0 dBm)
* 5835 MHz [167] (disabled)
* 5845 MHz [169] (disabled)
* 5855 MHz [171] (disabled)
* 5865 MHz [173] (disabled)
* 4920 MHz [184] (disabled)
* 4940 MHz [188] (disabled)
* 4960 MHz [192] (disabled)
* 4980 MHz [196] (disabled)
* 6040 MHz [208] (disabled)
* 6060 MHz [212] (disabled)
* 6080 MHz [216] (disabled)
Supported commands:
* new_interface
* set_interface
* new_key
* start_ap
* new_station
* new_mpath
* set_mesh_config
* set_bss
* authenticate
* associate
* deauthenticate
* disassociate
* join_ibss
* join_mesh
* set_tx_bitrate_mask
* frame
* frame_wait_cancel
* set_wiphy_netns
* set_channel
* set_wds_peer
* probe_client
* set_noack_map
* register_beacons
* start_p2p_device
* set_mcast_rate
* connect
* disconnect
* set_qos_map
* set_multicast_to_unicast
Supported TX frame types:
* IBSS: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0
0xc0 0xd0 0xe0 0xf0
* managed: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0
0xc0 0xd0 0xe0 0xf0
* AP: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0
0xd0 0xe0 0xf0
* AP/VLAN: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0
0xc0 0xd0 0xe0 0xf0
* mesh point: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0
0xb0 0xc0 0xd0 0xe0 0xf0
* P2P-client: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0
0xb0 0xc0 0xd0 0xe0 0xf0
* P2P-GO: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0
0xc0 0xd0 0xe0 0xf0
* P2P-device: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0
0xb0 0xc0 0xd0 0xe0 0xf0
Supported RX frame types:
* IBSS: 0x40 0xb0 0xc0 0xd0
* managed: 0x40 0xd0
* AP: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
* AP/VLAN: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
* mesh point: 0xb0 0xc0 0xd0
* P2P-client: 0x40 0xd0
* P2P-GO: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
* P2P-device: 0x40 0xd0
software interface modes (can always be added):
* AP/VLAN
* monitor
valid interface combinations:
* #{ AP, mesh point } <= 8,
  total <= 8, #channels <= 1
HT Capability overrides:
* MCS: ff ff ff ff ff ff ff ff ff ff
* maximum A-MSDU length
* supported channel width
* short GI for 40 MHz
* max A-MPDU length exponent
* min MPDU start spacing
Device supports TX status socket option.
Device supports HT-IBSS.
Device supports SAE with AUTHENTICATE command
Device supports low priority scan.
Device supports scan flush.
Device supports AP scan.
Device supports per-vif TX power setting
Driver supports full state transitions for AP/GO clients
Driver supports a userspace MPM
Device supports configuring vdev MAC-addr on create.
Supported extended features:
* [ RRM ]: RRM
* [ FILS_STA ]: STA FILS (Fast Initial Link Setup)
* [ CQM_RSSI_LIST ]: multiple CQM_RSSI_THOLD records
* [ CONTROL_PORT_OVER_NL80211 ]: control port over nl80211

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: rt2x00: 5Ghz signal power degradation with linux 5.2 kernel
  2019-08-29  9:42 ` rt2x00: 5Ghz signal power degradation with linux 5.2 kernel Sergey Maranchuk
@ 2019-08-29 10:03   ` Stanislaw Gruszka
  2019-08-29 11:13     ` Sergey Maranchuk
  0 siblings, 1 reply; 3+ messages in thread
From: Stanislaw Gruszka @ 2019-08-29 10:03 UTC (permalink / raw)
  To: Sergey Maranchuk; +Cc: linux-wireless

On Thu, Aug 29, 2019 at 12:42:44PM +0300, Sergey Maranchuk wrote:
> I got some problem after upgrade kernel to 5.2 version (debian testing
> linux-image-5.2.0-2-amd64). 5Ghz client  stopped to see AP.
> Some tests with 1metre distance between client-AP: 2.4Ghz  -22dBm, for
> 5Ghz - 53dBm !, for longer distance (8m + walls) 2.4 - 61dBm, 5Ghz not
> visible.
> All works fine with kernel 4.19 and on windows 10, other devices also
> see AP without any problems with same distance.

After looking on the changlog most possible cause of it seems to be
commit 9ad3b55654455258a9463384edb40077439d879f:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9ad3b55654455258a9463384edb40077439d879f

Please try to revert it, and see if that improve rx signal level. 

It that would not help, please try to narrow regression to two
consecutive kernel versions - it is: 4.19 -> 5.0 or 5.0 -> 5.1
or 5.1 -> 5.2 ?

Stanislaw

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: rt2x00: 5Ghz signal power degradation with linux 5.2 kernel
  2019-08-29 10:03   ` Stanislaw Gruszka
@ 2019-08-29 11:13     ` Sergey Maranchuk
  0 siblings, 0 replies; 3+ messages in thread
From: Sergey Maranchuk @ 2019-08-29 11:13 UTC (permalink / raw)
  To: Stanislaw Gruszka; +Cc: linux-wireless

Yes, it is!
After reverting this commit (i used debian 5.2 kernel sources +
patched rt2800lib.ko mod) i see my home 5Ghz network with -45dBm
tnx for quick help

чт, 29 авг. 2019 г. в 13:03, Stanislaw Gruszka <sgruszka@redhat.com>:
>
> On Thu, Aug 29, 2019 at 12:42:44PM +0300, Sergey Maranchuk wrote:
> > I got some problem after upgrade kernel to 5.2 version (debian testing
> > linux-image-5.2.0-2-amd64). 5Ghz client  stopped to see AP.
> > Some tests with 1metre distance between client-AP: 2.4Ghz  -22dBm, for
> > 5Ghz - 53dBm !, for longer distance (8m + walls) 2.4 - 61dBm, 5Ghz not
> > visible.
> > All works fine with kernel 4.19 and on windows 10, other devices also
> > see AP without any problems with same distance.
>
> After looking on the changlog most possible cause of it seems to be
> commit 9ad3b55654455258a9463384edb40077439d879f:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9ad3b55654455258a9463384edb40077439d879f
>
> Please try to revert it, and see if that improve rx signal level.
>
> It that would not help, please try to narrow regression to two
> consecutive kernel versions - it is: 4.19 -> 5.0 or 5.0 -> 5.1
> or 5.1 -> 5.2 ?
>
> Stanislaw

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2019-08-29 11:13 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
     [not found] <CAJp6tx-L0Q4_OaUp+xMod0jsLjAByqnbrvk=JbEq5LOxTdhr_g@mail.gmail.com>
2019-08-29  9:42 ` rt2x00: 5Ghz signal power degradation with linux 5.2 kernel Sergey Maranchuk
2019-08-29 10:03   ` Stanislaw Gruszka
2019-08-29 11:13     ` Sergey Maranchuk

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