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#1 2014-03-16 01:52:25

akv
Member
Registered: 2014-03-15
Posts: 3

[SOLVED] Intel Dual Band Wireless-N 7260, no 5Ghz after kernel upgrade

After upgrading to the 3.13 kernel, I can no longer see 5 Ghz networks.  I'm running Arch Linux on a Toshiba Satellite P55-A5312 with an Intel Dual Band Wireless-N 7260 card.

A search of the Arch forums revealed that the same problem was solved for a Qualcomm Atheros adapter by installing the crda package and setting the correct region code.  Here's the thread: https://bbs.archlinux.org/viewtopic.php … 4#p1384144

Installing crda and setting the correct region code didn't solve the problem.

I also tried downloading and installing the latest iwlwifi firmware from http://wireless.kernel.org/en/users/Drivers/iwlwifi.  That also didn't solve the problem.

I've downgraded to the 3.11 kernel as a temporary solution.

Is there a setting that has to be changed somewhere in order to get the 5 Ghz radio to work in the 3.13 kernel?

Last edited by akv (2014-03-28 02:15:09)

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#2 2014-03-22 22:33:11

maclinuxfree
Member
Registered: 2014-03-22
Posts: 8

Re: [SOLVED] Intel Dual Band Wireless-N 7260, no 5Ghz after kernel upgrade

same to me...kernel 3.12 and 3.13 no 5ghz....and the crda trick does not work

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#3 2014-03-28 02:11:50

akv
Member
Registered: 2014-03-15
Posts: 3

Re: [SOLVED] Intel Dual Band Wireless-N 7260, no 5Ghz after kernel upgrade

This issue has been resolved, though not in the way that I wanted.  Here's the breakdown:

The laptop also runs Windows 8.1.  In Windows, the card has only picked the 2.4GHz networks from the first day I bought the laptop.  I assumed it was a driver issue, as Windows 8.1. at the time had plenty of those.

From Windows, I used the driver update utility from the Intel Web site http://www.intel.com/p/en_US/support/detect.  The the utility detected my card as the AC version of the 7260.

Note that there are three versions of the  7260:  single-band, dual-band, and AC.  I don't have an AC router, so it's impossible to determine if my card picks up AC networks.

I called Toshiba's technical support.  After asking for the laptop's serial number, the representative insisted that my model comes with the single-band 7260, not the dual-band version.  I assured him that my laptop is able to see 5GHz networks in Linux. I also told him several times that the Intel Web site reports my card as the AC version. He came just short of accusing me of lying, and I came just short of offering to send him a video of the card picking up 5GHz networks.  I eventually hung up, as the conversation led nowhere.

I opened up the laptop as a last resort.  The Toshiba Satellite P55 requires you to remove the whole bottom panel to access anything inside.

The wireless card inside of my laptop was in fact the single-band 7260.

So, apparently the Dual Band and single-band versions of the Wireless-N 7260 are the same piece of hardware.  I assume that all three versions can pick up AC networks as well.  The drivers for the single-band version just have the 5GHz band deactivated.

I swapped out an Intel Centrino Advanced-N 6205 from my old laptop.  Works like a charm.

So, to conclude:

It seems that the new kernel simply identified the card correctly, so it only allows the card to pick up 2.4GHz networks, as its supposed to.

To anyone with the same problem, if you must use the 5GHz band there's two options:  Downgrade your kernel version or buy a different card (the dual-band 7260 costs about $25).

Hope this helped.  Sorry I don't have better news.

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#4 2014-04-01 12:10:58

maclinuxfree
Member
Registered: 2014-03-22
Posts: 8

Re: [SOLVED] Intel Dual Band Wireless-N 7260, no 5Ghz after kernel upgrade

still not solved...I installed the fresh released 3.14 mainline kernel...no 5GHz Band

what can I do ?

my lspci:

04:00.0 Network controller: Intel Corporation Wireless 7260 (rev 6b)

my modinfo iwlwifi:

filename:       /lib/modules/3.14.0-1-mainline/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko.gz
license:        GPL
author:         Copyright(c) 2003- 2014 Intel Corporation <ilw@linux.intel.com>
version:        in-tree:
description:    Intel(R) Wireless WiFi driver for Linux
firmware:       iwlwifi-100-5.ucode
firmware:       iwlwifi-1000-5.ucode
firmware:       iwlwifi-135-6.ucode
firmware:       iwlwifi-105-6.ucode
firmware:       iwlwifi-2030-6.ucode
firmware:       iwlwifi-2000-6.ucode
firmware:       iwlwifi-5150-2.ucode
firmware:       iwlwifi-5000-5.ucode
firmware:       iwlwifi-6000g2b-6.ucode
firmware:       iwlwifi-6000g2a-5.ucode
firmware:       iwlwifi-6050-5.ucode
firmware:       iwlwifi-6000-4.ucode
firmware:       iwlwifi-3160-7.ucode
firmware:       iwlwifi-7260-7.ucode
srcversion:     900BC7FF805B79DE0D82BFF
alias:          pci:v00008086d0000095Asv*sd00005490bc*sc*i*

depends:        cfg80211
intree:         Y
vermagic:       3.14.0-1-mainline SMP preempt mod_unload modversions
parm:           swcrypto:using crypto in software (default 0 [hardware]) (int)
parm:           11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm:           amsdu_size_8K:enable 8K amsdu size (default 0) (int)
parm:           fw_restart:restart firmware in case of error (default true) (bool)
parm:           antenna_coupling:specify antenna coupling in dB (defualt: 0 dB) (int)
parm:           wd_disable:Disable stuck queue watchdog timer 0=system default, 1=disable, 2=enable (default: 0) (int)
parm:           nvm_file:NVM file name (charp)
parm:           bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm:           led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0) (int)
parm:           power_save:enable WiFi power management (default: disable) (bool)
parm:           power_level:default power save level (range from 1 - 5, default: 1) (int)

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#5 2014-04-07 23:03:19

akv
Member
Registered: 2014-03-15
Posts: 3

Re: [SOLVED] Intel Dual Band Wireless-N 7260, no 5Ghz after kernel upgrade

Are you 100% sure that you have the dual-band model?  If you do have the dual-band model, then the best thing to do is start a new thread.  The information I provided only applies to the single-band version.

If you haven't opened up your laptop to check, then do so.  As I mentioned in the last post, the new kernel seems to identify the correct model and treats it accordingly.  Your only options are to downgrade your kernel or buy a dual-band card.

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#6 2014-04-08 20:04:59

maclinuxfree
Member
Registered: 2014-03-22
Posts: 8

Re: [SOLVED] Intel Dual Band Wireless-N 7260, no 5Ghz after kernel upgrade

Thank you...now it is solved...I bought a Dual-Band Card and 5Ghz is working...

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