5GHz wireless on Ubuntu

[Jim Byrnes]

On 11/17/2014 11:47 PM, Nils Kassube wrote:
> Jim Byrnes wrote:
>> I have a dual band Linsys 4200E router. On laptops running 12.04 on
>> one and 14.04 on the other I can connect at 2.4GHz but not 5GHz.
>> There are 3 android devices in the house that can connect to the 5GHz
>> so I know it is working.
>>
>> Is there some way to find out if the cards/drivers are capable of 5GHz
>> under Ubuntu?
>
> The command
>
> iw phy0 info

jfb at jim-Satellite:~$ iw phy0 info
Wiphy phy0
	Band 1:
		Capabilities: 0x1862
			HT20/HT40
			Static SM Power Save
			RX HT20 SGI
			RX HT40 SGI
			No RX STBC
			Max AMSDU length: 7935 bytes
			DSSS/CCK HT40
		Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
		Minimum RX AMPDU time spacing: 16 usec (0x07)
		HT TX/RX MCS rate indexes supported: 0-7, 32
		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)

                          <snip>

The output was over 125 lines so I cut it. I think the relevant part is 
that it only mentions Band 1:.  I can post the entire thing if you feel 
it is relevant.

> should list the frequencies (among lots of other things) on which your
> card can operate. If that command doesn't work (some cards may not use
> the necessary driver for that command), can you post the output of the
> command
>
> sudo lshw -C network

> in a terminal? That should tell us which WLAN card is used in your
> machine.

jfb at jim-Satellite:~$ sudo lshw -C network
[sudo] password for jfb:
   *-network
        description: Ethernet interface
        product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
        vendor: Realtek Semiconductor Co., Ltd.
        physical id: 0
        bus info: pci at 0000:01:00.0
        logical name: eth0
        version: 07
        serial: 00:8c:fa:70:c9:4c
        size: 10Mbit/s
        capacity: 100Mbit/s
        width: 64 bits
        clock: 33MHz
        capabilities: pm msi pciexpress msix vpd bus_master cap_list 
ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
        configuration: autonegotiation=on broadcast=yes driver=r8169 
driverversion=2.3LK-NAPI duplex=half firmware=rtl8106e-1_0.0.1 06/29/12 
latency=0 link=no multicast=yes port=MII speed=10Mbit/s
        resources: irq:77 ioport:3000(size=256) memory:f1000000-f1000fff 
memory:f0000000-f0003fff
   *-network
        description: Wireless interface
        product: RTL8188EE Wireless Network Adapter
        vendor: Realtek Semiconductor Co., Ltd.
        physical id: 0
        bus info: pci at 0000:05:00.0
        logical name: wlan0
        version: 01
        serial: 64:5a:04:81:74:a7
        width: 64 bits
        clock: 33MHz
        capabilities: pm msi pciexpress bus_master cap_list ethernet 
physical wireless
        configuration: broadcast=yes driver=rtl8188ee 
driverversion=3.13.0-39-generic firmware=N/A ip=192.168.1.127 latency=0 
link=yes multicast=yes wireless=IEEE 802.11bgn
        resources: irq:32 ioport:2000(size=256) memory:f2800000-f2803fff


Googling for specs on it does not bring much joy. To get a "datasheet" 
on it from Realtek I need to be a partner and sign an NDA.

Some posts on askubuntu and other forums seem to suggest it may be a 
driver issue and give instructions for compiling drivers, but I don't 
want to try that if it is not even capable of 5GHz.

>
> Nils
>
>

regards,  Jim