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reset12 opened this issue Aug 14, 2017 · 19 comments
Closed

RTL8192CU not possible to change tx-power #2164

reset12 opened this issue Aug 14, 2017 · 19 comments

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@reset12
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reset12 commented Aug 14, 2017

Hello,
i have installed Linux raspberrypi4 4.9.35-v7+ #1014 SMP Fri Jun 30 14:47:43 BST 2017 armv7l GNU/Linux
and will use the raspberry as a hotspot.
I am not be able to change tx-power or power-management parameter on wlan1(RTL8192CU).
iwconfig wlan1 txpower 10
Error for wireless request "Set Tx Power" (8B26) :
SET failed on device wlan1 ; Operation not permitted.
or
iwconfig wlan1 power on
Error for wireless request "Set Power Management" (8B2C) :
SET failed on device wlan1 ; Operation not permitted.

iwconfig
lo no wireless extensions.

wlan0 IEEE 802.11 ESSID:"7050"
Mode:Managed Frequency:2.462 GHz Access Point: C4:6E:1F:3A:87:82
Bit Rate=14.4 Mb/s Tx-Power=31 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
Link Quality=38/70 Signal level=-72 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:36 Invalid misc:0 Missed beacon:0

eth0 no wireless extensions.

wlan1 unassociated Nickname:"WIFI@REALTEK"
Mode:Auto Frequency=2.412 GHz Access Point: Not-Associated
Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

Bus 001 Device 007: ID 046d:0991 Logitech, Inc. QuickCam Pro for Notebooks
Bus 001 Device 006: ID 0bda:8178 Realtek Semiconductor Corp. RTL8192CU 802.11n WLAN Adapter
Bus 001 Device 005: ID 046d:082b Logitech, Inc.
Bus 001 Device 004: ID 04fa:2490 Dallas Semiconductor DS1490F 2-in-1 Fob, 1-Wire adapter
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

with regards
Markus
@pelwell
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pelwell commented Aug 14, 2017 •
edited
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Have you tried sudo iwconfig wlan1 power on etc.?

@reset12
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reset12 commented Aug 14, 2017

yes.
I tried all commands from root user.

oot@raspberrypi4:/home/t759f# sudo iwconfig wlan1 power on
Error for wireless request "Set Power Management" (8B2C) :
SET failed on device wlan1 ; Operation not permitted.

@pelwell
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pelwell commented Aug 14, 2017

From what I can see the rtl8192cu driver does not handle the SIOCSIWTXPOW ioctl. The dummy function returns -1 (yuck), which translates to -EPERM ("Operation not permitted").

@pelwell
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pelwell commented Aug 14, 2017

To complicate things, this card has multiple drivers - can you check which driver is being loaded (using lsmod)?

@pelwell
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pelwell commented Aug 14, 2017

I think we ship three drivers for that card - 8192cu (the default, downstream driver), rtl8192cu (the upstream driver) and rtl8xxxu (the new combo upstream driver). In Raspbian we blacklist rtl8192cu and rtl8xxxu:

$ grep . /etc/modprobe.d/blacklist-rtl8*
/etc/modprobe.d/blacklist-rtl8192cu.conf:blacklist rtl8192cu
/etc/modprobe.d/blacklist-rtl8xxxu.conf:blacklist rtl8xxxu

If you want to try another driver you need to blacklist the current driver:

sudo echo sh -c "blacklist 8192cu" > /etc/modprobe.d/blacklist-8192cu.conf

Then comment out one of the other blacklist lines, unplug and replug your dongle.

@reset12
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reset12 commented Aug 14, 2017

here ist my /etc/modprobe.d

ls -al /etc/modprobe.d/
insgesamt 52blacklist-8192cu.conf
drwxr-xr-x 2 root root 4096 Aug 14 13:06 .
drwxr-xr-x 123 root root 12288 Aug 14 08:02 ..
-rw-r--r-- 1 root root 17 Aug 14 13:06 blacklist-8192cu.conf
-rw-r--r-- 1 root root 336 Aug 14 08:06 blacklist-native-rtl8192.conf
-rw-r--r-- 1 root root 20 Mär 2 17:14 blacklist-rtl8192cu.conf
-rw-r--r-- 1 root root 19 Mär 2 17:15 blacklist-rtl8xxxu.conf
-rw-r--r-- 1 root root 127 Okt 4 2014 dkms.conf
-rw-r--r-- 1 root root 390 Apr 2 2016 fbdev-blacklist.conf
-rw-r--r-- 1 root root 65 Mai 27 2016 ipv6.conf
-rw-r--r-- 1 root root 16 Jul 23 2014 libpisock9.conf
-rw-r--r-- 1 root root 50 Nov 14 2014 owfs-common.conf
-rw-r--r-- 1 root root 0 Mai 27 2016 raspi-blacklist.conf

After Blacklist the driver lblacklist-8192cu.conf.
Wich driver should work ?

@reset12 reset12 closed this as completed Aug 14, 2017
@pelwell
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pelwell commented Aug 14, 2017

Interesting - you have four blacklist files for three drivers. Judging by the timestamps, the original Raspbian-sourced blacklists (for rtl819cu and rtl8xxxu) are still active, so if your new blacklist files include 8192cu then no drivers should be loaded automatically. This actually works - you just have to manually modprobe the driver you want.

I see that you have closed the issue - it would help other users if you could explain what you have discovered - but if you still need assistance then you'll need to show the contents of each of those files.

@reset12
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reset12 commented Aug 14, 2017

Tho close

@reset12 reset12 reopened this Aug 14, 2017
@reset12
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reset12 commented Aug 14, 2017

The close was an error.
You are right, i have no driver currently active and i dont know wich driver should work.
When i try to activate a driver i get an error:
/etc/modprobe.d# modprobe rtl8192cu
modprobe: ERROR: ../libkmod/libkmod-module.c:960 command_do() Error running install command for rtlwifi
modprobe: ERROR: could not insert 'rtl8192cu': Operation not permitted

@reset12 reset12 closed this as completed Aug 14, 2017
@pelwell pelwell reopened this Aug 14, 2017
@pelwell
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pelwell commented Aug 14, 2017

if you still need assistance then you'll need to show the contents of each of those files.

@reset12
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reset12 commented Aug 14, 2017 •
edited by pelwell
Loading 

cat blacklist-8192cu.conf
blacklist 8192cu

cat blacklist-native-rtl8192.conf
## This file ships with the rtl8192-fixes DKMS module.
## Keep the native (and currently broken) kernel driver from loading so ours
## is used instead:
install rtl8192cu /bin/false
install rtl8192c_common /bin/false
install rtlwifi /bin/false
## There is also a new mainline driver starting with kernel v4.4
install rtl8xxxu /bin/false

cat blacklist-rtl8192cu.conf
blacklist rtl8192cu

cat blacklist-rtl8xxxu.conf
blacklist rtl8xxxu

I hope this will help.

@reset12 reset12 closed this as completed Aug 14, 2017
@reset12 reset12 reopened this Aug 14, 2017
@pelwell
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pelwell commented Aug 14, 2017 •
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I don't recognise blacklist-native-rtl8192.conf - is that an Ubuntu file? Try deleting/moving it, then commenting out blacklist rtl8xxxu, so you get:

$ cat blacklist-rtl8xxxu.conf
#blacklist rtl8xxxu

That should activate the rtl8xxxu driver - confirm that with an lsmod after reconnecting the dongle. If that doesn't work for you, remove the '#' comment character and put another one in blacklist-rtl8192cu.conf:

cat blacklist-rtl8192cu.conf
#blacklist rtl8192cu

and try again.

@reset12
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reset12 commented Aug 14, 2017

[ 75.742174] usbcore: registered new interface driver rtl8xxxu
[ 218.786585] usb 1-1.4: USB disconnect, device number 6
[ 224.197273] usb 1-1.4: new high-speed USB device number 8 using dwc_otg
[ 224.328679] usb 1-1.4: New USB device found, idVendor=0bda, idProduct=8178
[ 224.328692] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 224.328699] usb 1-1.4: Product: 802.11n WLAN Adapter
[ 224.328707] usb 1-1.4: Manufacturer: Realtek
[ 224.328715] usb 1-1.4: SerialNumber: 00e04c000001
root@raspberrypi4:/home/t759f# lsusb
Bus 001 Device 007: ID 046d:0991 Logitech, Inc. QuickCam Pro for Notebooks
Bus 001 Device 008: ID 0bda:8178 Realtek Semiconductor Corp. RTL8192CU 802.11n WLAN Adapter
Bus 001 Device 005: ID 046d:082b Logitech, Inc.
Bus 001 Device 004: ID 04fa:2490 Dallas Semiconductor DS1490F 2-in-1 Fob, 1-Wire adapter
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
root@raspberrypi4:/home/t759f# ifconfig wlan1 up
wlan1: ERROR while getting interface flags: Kein passendes Gerät gefunden

  1. Try:
    ifconfig
    eth0 Link encap:Ethernet Hardware Adresse b8:27:eb:f5:59:04
    inet6-Adresse: fe80::3990:121e:6f07:9f64/64 Gültigkeitsbereich:Verbindung
    UP BROADCAST MULTICAST MTU:1500 Metrik:1
    RX packets:0 errors:0 dropped:0 overruns:0 frame:0
    TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
    Kollisionen:0 Sendewarteschlangenlänge:1000
    RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

lo Link encap:Lokale Schleife
inet Adresse:127.0.0.1 Maske:255.0.0.0
inet6-Adresse: ::1/128 Gültigkeitsbereich:Maschine
UP LOOPBACK RUNNING MTU:65536 Metrik:1
RX packets:230 errors:0 dropped:0 overruns:0 frame:0
TX packets:230 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1
RX bytes:18692 (18.2 KiB) TX bytes:18692 (18.2 KiB)

wlan0 Link encap:Ethernet Hardware Adresse b8:27:eb:a0:0c:51
inet Adresse:192.168.1.5 Bcast:192.168.1.255 Maske:255.255.255.0
inet6-Adresse: fe80::ba27:ebff:fea0:c51/64 Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1
RX packets:177 errors:0 dropped:0 overruns:0 frame:0
TX packets:208 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX bytes:15568 (15.2 KiB) TX bytes:71256 (69.5 KiB)

wlan1 Link encap:Ethernet Hardware Adresse 00:0d:81:ac:8b:f8
UP BROADCAST MULTICAST MTU:1500 Metrik:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
ifconfig
eth0 Link encap:Ethernet Hardware Adresse b8:27:eb:f5:59:04
inet6-Adresse: fe80::3990:121e:6f07:9f64/64 Gültigkeitsbereich:Verbindung
UP BROADCAST MULTICAST MTU:1500 Metrik:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

lo Link encap:Lokale Schleife
inet Adresse:127.0.0.1 Maske:255.0.0.0
inet6-Adresse: ::1/128 Gültigkeitsbereich:Maschine
UP LOOPBACK RUNNING MTU:65536 Metrik:1
RX packets:230 errors:0 dropped:0 overruns:0 frame:0
TX packets:230 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1
RX bytes:18692 (18.2 KiB) TX bytes:18692 (18.2 KiB)

wlan0 Link encap:Ethernet Hardware Adresse b8:27:eb:a0:0c:51
inet Adresse:192.168.1.5 Bcast:192.168.1.255 Maske:255.255.255.0
inet6-Adresse: fe80::ba27:ebff:fea0:c51/64 Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1
RX packets:177 errors:0 dropped:0 overruns:0 frame:0
TX packets:208 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX bytes:15568 (15.2 KiB) TX bytes:71256 (69.5 KiB)

wlan1 Link encap:Ethernet Hardware Adresse 00:0d:81:ac:8b:f8
UP BROADCAST MULTICAST MTU:1500 Metrik:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

cat blacklist-rtl8192cu.conf
#blacklist rtl8192cu

^C
root@raspberrypi4:/etc/modprobe.d# lsmod
Module Size Used by
bnep 12051 2
hci_uart 20020 1
btbcm 7916 1 hci_uart
bluetooth 365511 22 hci_uart,bnep,btbcm
arc4 2211 2
ip6t_REJECT 1751 1
nf_reject_ipv6 3665 1 ip6t_REJECT
nf_log_ipv6 5412 4
rtl8192cu 81479 0

iwconfig wlan1
wlan1 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Encryption key:off
Power Management:off

root@raspberrypi4:/etc/modprobe.d# iwconfig wlan1 tx-power 10
iwconfig: unknown command "tx-power"
root@raspberrypi4:/etc/modprobe.d# iwconfig wlan1 txpower 10
root@raspberrypi4:/etc/modprobe.d# iwconfig
lo no wireless extensions.

wlan0 IEEE 802.11 ESSID:"7050"
Mode:Managed Frequency:2.462 GHz Access Point: C4:6E:1F:3A:87:82
Bit Rate=26 Mb/s Tx-Power=31 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
Link Quality=36/70 Signal level=-74 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:17 Invalid misc:0 Missed beacon:0

eth0 no wireless extensions.

wlan1 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Encryption key:off
Power Management:off

With the driver rtl8192cu tx-Power is displayed and i can use the "iwconfig wlan1 txpower 10" without an error message, but the command does not change anything.

iwconfig
lo no wireless extensions.

wlan0 IEEE 802.11 ESSID:"7050"
Mode:Managed Frequency:2.462 GHz Access Point: C4:6E:1F:3A:87:82
Bit Rate=43.3 Mb/s Tx-Power=31 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
Link Quality=36/70 Signal level=-74 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:20 Invalid misc:0 Missed beacon:0

eth0 no wireless extensions.

wlan1 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Encryption key:off
Power Management:off

root@raspberrypi4:/etc/modprobe.d# iwconfig wlan1 power on
Error for wireless request "Set Power Management" (8B2C) :
SET failed on device wlan1 ; Operation not supported.

This driver is also not the best solution.

I must now leave, thank you for your support, i will be back iin 2 Days.

with regards
Markus

@pelwell
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pelwell commented Aug 14, 2017

Hmmm, I'd say none of the drivers supports any user control of TX power - they just set it based on channel number and regulatory domain. You either need to try hacking the driver or find another device with the required capability. Either way, it isn't a Pi-specific problem.

@reset12
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reset12 commented Aug 16, 2017

Thank you Pelwell,
i am not be able to hacking the driver, so can you tell me a USB-Wifi Dongle with Long-Range capability.
My Raspberry is located in my chicken House and i need it as Wifi Hotspot when i work in the garden, because the Gsm-Mobile net is not available.

@reset12 reset12 closed this as completed Aug 16, 2017
@pelwell
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pelwell commented Aug 16, 2017

I can't recommend a device because I haven't tested external WiFi dongles - sorry - but there is a page listing WiFi dongles supported on Raspberry Pi and some of their features here: http://elinux.org/RPi_USB_Wi-Fi_Adapters

@7045kHz
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7045kHz commented Jun 6, 2020 •
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years later I ran into the same issue with the onboard wifi for a pi v 4. Turned out the issue I had was with iwconfig. I was able to fix it, and thought I would share.

Power Status

pi@raspberrypi4:~ $ iwconfig
eth0      no wireless extensions.

wlan0     IEEE 802.11  Mode:Master  Tx-Power=31 dBm
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on

Failure using iwconfig to set power off.

pi@raspberrypi4:~ $ sudo iwconfig wlan0 power off
Error for wireless request "Set Power Management" (8B2C) :
    SET failed on device wlan0 ; Operation not permitted.

Solution - using iw instead of iwconfig

pi@raspberrypi4:~$ sudo iw dev wlan0 set power_save off
pi@raspberrypi4:~$ iwconfig
eth0      no wireless extensions.

wlan0     IEEE 802.11  Mode:Master  Tx-Power=31 dBm
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off

lo        no wireless extensions.

@Nifra514
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try :

iw wlan0 set txpower fixed 3000

@mishueen
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mishueen commented Apr 29, 2023 •
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Nirfa514

Thank you !

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@pelwell @reset12 @Nifra514 @7045kHz @mishueen