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#1 2017-07-30 17:36:40

alexpe87
Member
Registered: 2013-08-19
Posts: 12

[Resolved] Intel 8265 Dual not finding 5Ghz WiFi

Hi everyone,

I have a Lenovo T470S notebook with Intel Dual Band Wireless AC8254, REV=0x230 (as seen in dmesg by the kernel) adapter. According to the online documentation at Lenovo, the card should support Dual Band (= 2.4 and 5ghz wifi), thus I should be able to at least see both my 2.4 and 5 ghz wifi at home I supposed.

dmesg | grep iwl
[    2.375777] iwlwifi 0000:3a:00.0: enabling device (0000 -> 0002)
[    2.378130] iwlwifi 0000:3a:00.0: Direct firmware load for iwlwifi-8265-30.ucode failed with error -2
[    2.378153] iwlwifi 0000:3a:00.0: Direct firmware load for iwlwifi-8265-29.ucode failed with error -2
[    2.378173] iwlwifi 0000:3a:00.0: Direct firmware load for iwlwifi-8265-28.ucode failed with error -2
[    2.381468] iwlwifi 0000:3a:00.0: capa flags index 3 larger than supported by driver
[    2.382271] iwlwifi 0000:3a:00.0: loaded firmware version 27.455470.0 op_mode iwlmvm
[    2.416176] iwlwifi 0000:3a:00.0: Detected Intel(R) Dual Band Wireless AC 8265, REV=0x230
[    2.421229] iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled
[    2.422101] iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled
[    2.551204] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
[    2.598101] iwlwifi 0000:3a:00.0 wlp58s0: renamed from wlan0
[    2.805363] iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled
[    2.805888] iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled
[    2.923018] iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled
[    2.924058] iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled
[    3.020004] iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled
[    3.021410] iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled
[    3.138236] iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled
[    3.139007] iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled

And lspci shows this:

3a:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
	Subsystem: Intel Corporation Device 1010
	Flags: bus master, fast devsel, latency 0, IRQ 280
	Memory at ec100000 (64-bit, non-prefetchable) [size=8K]
	Capabilities: [c8] Power Management version 3
	Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
	Capabilities: [40] Express Endpoint, MSI 00
	Capabilities: [100] Advanced Error Reporting
	Capabilities: [140] Device Serial Number 00-28-f8-ff-ff-89-da-b9
	Capabilities: [14c] Latency Tolerance Reporting
	Capabilities: [154] L1 PM Substates
	Kernel driver in use: iwlwifi
	Kernel modules: iwlwifi

Any ideas or hints what I could try to do? I'm quite certain the card should be 5GHz capable and would like to turn off 2.4 here at home (as I barely use it now - no other devices use it anymore...)

Last edited by alexpe87 (2017-07-30 18:25:49)

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#2 2017-07-30 18:06:49

ratcheer
Member
Registered: 2011-10-09
Posts: 854

Re: [Resolved] Intel 8265 Dual not finding 5Ghz WiFi

You might try moving closer to the wi-fi router and seeing if it will connect in the 5 gHz band. My notebook PC has an Intel 8265, and it will connect to 5 gHz 802.11ac in the den or living room, but only 2.4 gHz 802.11n in the kitchen or out on the patio. I think my problem is that my PC has only one antenna, while it is supposed to have two. So, you could check that, too.

Also, what version of iwlwifi do you have installed (not that I think it would make a big difference)? I have something like version 26 or 27.

Tim

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#3 2017-07-30 18:10:48

alexpe87
Member
Registered: 2013-08-19
Posts: 12

Re: [Resolved] Intel 8265 Dual not finding 5Ghz WiFi

My old notebook is just ~1m away from the router and capable to connect with 5GHZ. Meanwhile, I think I found a solution: Version 27 of the iwlwifi for 8265 doesn't work with 5Ghz apparently. I manually removed the firmware, rebooted the machine and my notebook loaded version 21 - works like a charm now and finds all kinds of 5Ghz WiFis around. So in case someone else has that issue:

ls /usr/lib/firmware/iwlfi-*
sudo rm /usr/lib/firmware/iwlwifi-<yourdevicename>-<version_not_working>

In case something goes odd, you can reinstall these with

sudo pacman -S linux-firmware

Thanks for your comments, it probably had something to do with the newer version 27 of my firmware for Intels 8265 wifi adapter. I definitely found 2 antennas connected in my notebook ;-)

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#4 2017-07-30 18:11:20

x33a
Forum Fellow
Registered: 2009-08-15
Posts: 4,586
Website

Re: [Resolved] Intel 8265 Dual not finding 5Ghz WiFi

Please post the output of

iwlist scan

Edit: Nevermind. Please mark the thread as solved.

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