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This question is duplicate of this question. I am running 18.04 and having same problems as that of the linked question that is my hotspot created by linux gives very slow internet speed on my mobile. The linked question did not have any answer that's why I am asking this question again. I have ethernet connection which provides 80Mbps download speed. Also hotspot created using Windows provides better speed.

Please do not downvote this question. Either ask me to delete it or edit it accordingly.

Related Information

My wireless driver is rtl8723be

Kernel Version and other things-

Linux puru-PC 4.15.0-34-generic #37-Ubuntu SMP Mon Aug 27 15:21:48 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Output of iwconfig

lo        no wireless extensions.

eno1      no wireless extensions.

wlo1      IEEE 802.11  Mode:Master  Tx-Power=20 dBm   

          Retry short limit:7   RTS thr=2347 B   Fragment thr:off

          Power Management:off

Output of ifconfig

eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 172.24.1.73  netmask 255.255.248.0  broadcast 172.24.7.255

        inet6 fe80::5675:a79e:1107:813a  prefixlen 64  scopeid 0x20<link>

        ether 70:5a:0f:2a:1e:bc  txqueuelen 1000  (Ethernet)

        RX packets 7078311  bytes 8373543554 (8.3 GB)

        RX errors 0  dropped 2981  overruns 0  frame 0

        TX packets 2811337  bytes 295452598 (295.4 MB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::1  prefixlen 128  scopeid 0x10<host>

        loop  txqueuelen 1000  (Local Loopback)

        RX packets 40240  bytes 3773824 (3.7 MB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 40240  bytes 3773824 (3.7 MB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



wlo1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 10.42.0.1  netmask 255.255.255.0  broadcast 10.42.0.255

        inet6 fe80::b278:4297:4437:1448  prefixlen 64  scopeid 0x20<link>

        ether 68:14:01:66:72:fb  txqueuelen 1000  (Ethernet)

        RX packets 56291  bytes 35741642 (35.7 MB)

        RX errors 0  dropped 1  overruns 0  frame 0

        TX packets 67298  bytes 88097804 (88.0 MB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Output of lspci | grep Wireless

03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter

I am removed all type of power saving modes by using these parameters in my /etc/modprobe.d/rtl8723be.conf -

options rtl8723be fwlps=0 ant_sel=2 ips=0 swlps=0

I also used this command to disable powersave for wireless connections-

sudo sed -i 's/wifi.powersave = 3/wifi.powersave = 2/' /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf

My entropy as given by cat /proc/sys/kernel/random/entropy_avail is 3742

Output of sudo lshw -class network

  *-network                 

   description: Wireless interface

   product: RTL8723BE PCIe Wireless Network Adapter

   vendor: Realtek Semiconductor Co., Ltd.

   physical id: 0

   bus info: pci@0000:03:00.0

   logical name: wlo1

   version: 00

   serial: 68:14:01:66:72:fb

   width: 64 bits

   clock: 33MHz

   capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless

   configuration: broadcast=yes driver=rtl8723be driverversion=4.15.0-34-generic firmware=N/A ip=10.42.0.1 latency=0 link=yes multicast=yes wireless=IEEE 802.11

   resources: irq:17 ioport:4000(size=256) memory:94100000-94103fff

 *-network

       description: Ethernet interface

       product: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller

       vendor: Realtek Semiconductor Co., Ltd.

       physical id: 0

       bus info: pci@0000:04:00.0

       logical name: eno1

       version: 0a

       serial: 70:5a:0f:2a:1e:bc

       size: 100Mbit/s

       capacity: 100Mbit/s

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress msix 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=full firmware=rtl8107e-2_0.0.2 02/26/15 ip=172.24.1.73 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s

       resources: irq:16 ioport:3000(size=256) memory:94004000-94004fff memory:94000000-94003fff

Output of lsusb

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

Bus 001 Device 004: ID 0bda:b006 Realtek Semiconductor Corp. 

Bus 001 Device 003: ID 046d:c52b Logitech, Inc. Unifying Receiver

Bus 001 Device 002: ID 0408:50b0 Quanta Computer, Inc. 

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Output of lspci

00:00.0 Host bridge: Intel Corporation Skylake Host Bridge/DRAM Registers (rev 08)

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07)

00:04.0 Signal processing controller: Intel Corporation Skylake Processor Thermal Subsystem (rev 08)

00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)

00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)

00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)

00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21)

00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port (rev f1)

00:1c.4 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #5 (rev f1)

00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #6 (rev f1)

00:1d.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #9 (rev f1)

00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21)

00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)

00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)

00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)

01:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 940M] (rev a2)

02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev 01)

03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter

04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller (rev 0a)

Output of rfkill list all

6: hci0: Bluetooth

    Soft blocked: yes

    Hard blocked: no



10: phy0: Wireless LAN

        Soft blocked: no

        Hard blocked: no

Output of dmesg | grep -i firmware

[    0.032837] Spectre V2 : Enabling Restricted Speculation for firmware calls

[    0.080030] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored

[    1.435586] [Firmware Bug]: Invalid critical threshold (0)

[    2.369155] [drm] Finished loading DMC firmware i915/skl_dmc_ver1_26.bin (v1.26)

[    2.381629] [Firmware Bug]: ACPI(PXSX) defines _DOD but not _DOS

[   21.967208] bluetooth hci0: Direct firmware load for rtl_bt/rtl8723b_config.bin failed with error -2

[   22.297776] rtl8723be: Using firmware rtlwifi/rtl8723befw_36.bin

[ 1380.179431] rtl8723be: Using firmware rtlwifi/rtl8723befw_36.bin

[ 4132.061459] bluetooth hci0: Direct firmware load for rtl_bt/rtl8723b_config.bin failed with error -2

[10383.619526] bluetooth hci0: Direct firmware load for rtl_bt/rtl8723b_config.bin failed with error -2

[10423.544817] bluetooth hci0: Direct firmware load for rtl_bt/rtl8723b_config.bin failed with error -2

[11441.006608] bluetooth hci0: Direct firmware load for rtl_bt/rtl8723b_config.bin failed with error -2

[31225.151414] rtl8723be: Using firmware rtlwifi/rtl8723befw_36.bin

[31567.860581] rtl8723be: Using firmware rtlwifi/rtl8723befw_36.bin

[31587.048842] rtl8723be: Using firmware rtlwifi/rtl8723befw_36.bin

[32189.414759] rtl8723be: Using firmware rtlwifi/rtl8723befw_36.bin

**Output of the difference of dmesg before connecting to hotspot and after connecting to hotspot **

[35243.538760] netlink: 'wpa_supplicant': attribute type 213 has an invalid length.

[35243.549651] IPv6: ADDRCONF(NETDEV_CHANGE): wlo1: link becomes ready

[35251.991517] netlink: 'wpa_supplicant': attribute type 213 has an invalid length.

[35251.991704] netlink: 'wpa_supplicant': attribute type 213 has an invalid length.

[35252.020276] rtlwifi: -----hwsec_cam_bitmap: 0x0 entry_idx=4

[35269.022094] netlink: 'wpa_supplicant': attribute type 213 has an invalid length.

[35269.042912] IPv6: ADDRCONF(NETDEV_UP): wlo1: link is not ready

[35270.151052] wlo1: authenticate with 1c:5f:2b:5c:e8:68

[35270.161140] wlo1: send auth to 1c:5f:2b:5c:e8:68 (try 1/3)

[35270.166785] wlo1: authenticated

[35270.168701] wlo1: associate with 1c:5f:2b:5c:e8:68 (try 1/3)

[35270.173415] wlo1: RX AssocResp from 1c:5f:2b:5c:e8:68 (capab=0x411 status=0 aid=8)

[35270.173576] wlo1: associated

[35270.242194] IPv6: ADDRCONF(NETDEV_CHANGE): wlo1: link becomes ready

[35272.761996] wlo1: deauthenticating from 1c:5f:2b:5c:e8:68 by local choice (Reason: 3=DEAUTH_LEAVING)

[35272.828998] netlink: 'wpa_supplicant': attribute type 213 has an invalid length.

[35284.074902] netlink: 'wpa_supplicant': attribute type 213 has an invalid length.

[35284.075154] netlink: 'wpa_supplicant': attribute type 213 has an invalid length.

[35284.177442] rtlwifi: -----hwsec_cam_bitmap: 0x0 entry_idx=4

I have tried to include as much technical details as possible by looking at the details of the linked question. I will attach other information if needed. Thanks in advance.

The bug is fixed with this kernel:

http://kernel.ubuntu.com/~jsalisbury/lp1788997

as long as you select antenna 1:

modprobe rtl8723be ant_sel=1

It may not be related to Realtech at all,
as I tried USB D-Link DWA-125 with same 0.7 mbps download speed
(by the way, upload speed is higher, between 2-3 mbps)