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#1 2019-02-22 03:52:33

erakis
Member
Registered: 2017-12-12
Posts: 13

[SOLVED] Intel Wireless 8260 slow bitrate arch but fast on Windows 10

Hi,

After a couple of day trying to understand why I can't get more speed from my wifi card, I'm now here to ask for help...

I have a Dell Precision 7510 with a dual boot (Linux Arch / Windows 10).

When booting on Windows 10 I'm getting a fast 5Ghz bitrate connection (~650mbps)
When booting on Arch I'm getting a slow 54Mbps bitrate.

Here is some information

$ lspci -k | grep Network
02:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)
$ ifconfig
wlp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.88.227  netmask 255.255.255.0  broadcast 192.168.88.255
        inet6 fe80::1349:81cc:b3f6:8718  prefixlen 64  scopeid 0x20<link>
        ether 34:f3:9a:f6:4d:20  txqueuelen 1000  (Ethernet)
        RX packets 4412  bytes 4894555 (4.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2652  bytes 400475 (391.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp0s31f6: <BROADCAST,MULTICAST,DYNAMIC> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000
    link/ether 18:db:f2:58:c4:d4 brd ff:ff:ff:ff:ff:ff
3: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DORMANT group default qlen 1000
    link/ether 34:f3:9a:f6:4d:20 brd ff:ff:ff:ff:ff:ff
$ thtool wlp2s0
Settings for wlp2s0:
	Link detected: yes
$ iwlist bitrate
enp0s31f6  no bit-rate information.

wlp2s0    unknown bit-rate information.
          Current Bit Rate=54 Mb/s

lo        no bit-rate information.
$ iwconfig
lo        no wireless extensions.

wlp2s0    IEEE 802.11  ESSID:"-----"  
          Mode:Managed  Frequency:5.18 GHz  Access Point: CC:2D:E0:E0:7D:A0   
          Bit Rate=54 Mb/s   Tx-Power=22 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=56/70  Signal level=-54 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:63   Missed beacon:0

enp0s31f6  no wireless extensions.
$ iw dev
phy#0
	Unnamed/non-netdev interface
		wdev 0x2
		addr 34:f3:9a:f6:4d:21
		type P2P-device
		txpower 0.00 dBm
	Interface wlp2s0
		ifindex 3
		wdev 0x1
		addr 34:f3:9a:f6:4d:20
		ssid ---------------
		type managed
		channel 36 (5180 MHz), width: 20 MHz (no HT), center1: 5180 MHz
		txpower 22.00 dBm
$ dmesg | grep cfg80211
[    6.992845] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[    7.029362] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
$ iw reg get
global
country CA: DFS-FCC
	(2402 - 2472 @ 40), (N/A, 30), (N/A)
	(5150 - 5250 @ 80), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
	(5250 - 5350 @ 80), (N/A, 24), (0 ms), DFS, AUTO-BW
	(5470 - 5600 @ 80), (N/A, 24), (0 ms), DFS
	(5650 - 5730 @ 80), (N/A, 24), (0 ms), DFS
	(5735 - 5835 @ 80), (N/A, 30), (N/A)

phy#0 (self-managed)
country 00: 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 @ 80), (6, 22), (N/A), NO-OUTDOOR, AUTO-BW, IR-CONCURRENT, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
	(5190 - 5210 @ 80), (6, 22), (N/A), NO-OUTDOOR, AUTO-BW, IR-CONCURRENT, NO-HT40PLUS, NO-160MHZ, PASSIVE-SCAN
	(5210 - 5230 @ 80), (6, 22), (N/A), NO-OUTDOOR, AUTO-BW, IR-CONCURRENT, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
.....
$ journalctl -b | grep iwlwifi
kernel: iwlwifi 0000:02:00.0: enabling device (0000 -> 0002)
kernel: iwlwifi 0000:02:00.0: loaded firmware version 36.9f0a2d68.0 op_mode iwlmvm
kernel: iwlwifi 0000:02:00.0: Detected Intel(R) Dual Band Wireless AC 8260, REV=0x208
kernel: iwlwifi 0000:02:00.0: base HW address: 34:f3:9a:f6:4d:20
kernel: iwlwifi 0000:02:00.0 wlp2s0: renamed from wlan0
 ls /lib/firmware/iwl*8000* -lh
-rw-r--r-- 1 root root 1.7M Feb 13 05:16 /lib/firmware/iwlwifi-8000C-13.ucode
-rw-r--r-- 1 root root 2.3M Feb 13 05:16 /lib/firmware/iwlwifi-8000C-16.ucode
-rw-r--r-- 1 root root 2.3M Feb 13 05:16 /lib/firmware/iwlwifi-8000C-21.ucode
-rw-r--r-- 1 root root 2.1M Feb 13 05:16 /lib/firmware/iwlwifi-8000C-22.ucode
-rw-r--r-- 1 root root 2.2M Feb 13 05:16 /lib/firmware/iwlwifi-8000C-27.ucode
-rw-r--r-- 1 root root 2.3M Feb 13 05:16 /lib/firmware/iwlwifi-8000C-31.ucode
-rw-r--r-- 1 root root 2.4M Feb 13 05:16 /lib/firmware/iwlwifi-8000C-34.ucode
-rw-r--r-- 1 root root 2.4M Feb 13 05:16 /lib/firmware/iwlwifi-8000C-36.ucode

Best regards,

Last edited by erakis (2019-02-25 14:08:41)

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#2 2019-02-22 10:34:55

progandy
Member
Registered: 2012-05-17
Posts: 5,190

Re: [SOLVED] Intel Wireless 8260 slow bitrate arch but fast on Windows 10

Did you try 11n_disable=8?
https://wiki.archlinux.org/index.php/Wi … on#iwlwifi

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#3 2019-02-22 13:58:42

erakis
Member
Registered: 2017-12-12
Posts: 13

Re: [SOLVED] Intel Wireless 8260 slow bitrate arch but fast on Windows 10

progandy wrote:

Opened the file, add the line, reboot the laptop and it's now working !!! Thank you so much I now have a fast link (866Mbps).

$ iwconfig
lo        no wireless extensions.

wlp2s0    IEEE 802.11  ESSID:"-------"  
          Mode:Managed  Frequency:5.18 GHz  Access Point: CC:2D:E0:E0:7D:A0   
          Bit Rate=866.7 Mb/s   Tx-Power=22 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=58/70  Signal level=-52 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:28   Missed beacon:0

I remember trying that before, but it did not seem to have worked. Maybe I did not have the acquired knowledge in the meantime ...

One last thing, off topic, why when I use modprobe to remove and reactivate the driver, it does not work? I tried to turn off the network card before executing this command, but without success.

Last edited by erakis (2019-02-25 14:07:03)

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#4 2019-02-22 15:55:44

progandy
Member
Registered: 2012-05-17
Posts: 5,190

Re: [SOLVED] Intel Wireless 8260 slow bitrate arch but fast on Windows 10

One last thing, off topic, why when I use modprobe to remove and reactivate the driver, it does not work? I tried to turn off the network card before executing this command, but without success.

No idea.

Last edited by progandy (2019-02-22 15:57:06)

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