Public bug reported:
I am using the Realtek 8821C PCIE Wifi driver that is provided in the
Additional drivers app of Ubuntu. When I connect to a 2.4 ghz network,
the internet speed is very slow, it rarely goes above 4mbps. But the
driver works fine when connected to a 5ghz network, easily reaching
speeds of over 80mbps. I don't think it is a problem of my wifi router
because in Windows OS running on the same laptop, I mostly get speeds of
around 40mbps when connected to the 2.4 ghz network.
1. What is the full computer model number?
Ans: HP Laptop 15s-eq0500AU.
2. If you update your BIOS to the newest version following the guide here, does
this change anything?
Ans: No.
3. Regarding your wireless Access Point (WAP):
3c. What wireless connection type are you using (802.11ac, 802.11n 150/300,
802.11g, etc.)?
Ans: 802.11n
3d. If you switch to a different wireless type (802.11g or 802.11n if you are
using 802.11g) does this change anything?
Ans: Yes, in the 5ghz 802.11ac type, the speed is very normally very good.
3f. In order to understand the wireless environment your WAP is working in,
please provide the output of the following terminal command:
sudo iw dev wlan0 scan | grep -i "ds parameter set"
Ans: [sudo] password for soumadeepsarkar1:
command failed: No such device (-19)
Output of
sudo iw dev wlo1 scan | grep -i "ds parameter set"
DS Parameter set: channel 11
DS Parameter set: channel 149
DS Parameter set: channel 149
DS Parameter set: channel 11
DS Parameter set: channel 2
DS Parameter set: channel 6
DS Parameter set: channel 10
DS Parameter set: channel 1
DS Parameter set: channel 7
DS Parameter set: channel 13
DS Parameter set: channel 1
DS Parameter set: channel 1
DS Parameter set: channel 4
DS Parameter set: channel 3
DS Parameter set: channel 10
3g. What encryption type are you using (ex. WEP, WPA2-PSK, etc.)?
Ans: WPA2-PSK
3o. What frequency are you using (2.4GHz, 5GHz, etc.)?
Ans: 2.4 GHz
3p. If you change frequency does it change anything?
Ans: Yes, speed is good in 5ghz
4. Does another wireless device tested with the WAP have the same problem as
the hardware you initially reported with?
Ans: No.
5. What is the distance of the wireless device from the WAP?
Ans: 6 metre
6. What is the number and type of obstructions between your device and the WAP?
Ans: 2
6a. If you bring the device close to the WAP and eliminate obstructions, does
this change anything?
Ans: No
7. Does the issue occur with different WAPs?
Ans: Yes
8. Is it a regression (i.e. did the problem happen in a prior Ubuntu release)?
If so, what release specifically did it last work with? If you do not know,
could you please test for this in the earliest release of Ubuntu that is
supported as per Ubuntu Releases?
Ans: I don't know if it is a regression and I cannot test for this in another
release of Ubuntu.
9. Does this problem occur in the newest mainline kernel following
https://wiki.ubuntu.com/Kernel/MainlineBuilds? Please mention what specific
version of the mainline kernel you tested with in your report.
Ans: Kernel version: 5.11.0-25-generic
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: linux-image-5.11.0-25-generic 5.11.0-25.27
ProcVersionSignature: Ubuntu 5.11.0-25.27-generic 5.11.22
Uname: Linux 5.11.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: soumadeepsarkar1 1797 F.... pulseaudio
/dev/snd/controlC0: soumadeepsarkar1 1797 F.... pulseaudio
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Sun Jul 25 10:11:55 2021
InstallationDate: Installed on 2021-07-02 (23 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64
(20210209.1)
MachineType: HP HP Laptop 15s-eq0xxx
ProcEnviron:
LANGUAGE=en_IN:en
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_IN
SHELL=/bin/bash
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-25-generic
root=UUID=2d1ce438-fd55-446d-8d61-e2d579055204 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.11.0-25-generic N/A
linux-backports-modules-5.11.0-25-generic N/A
linux-firmware 1.197.2
SourcePackage: linux
UpgradeStatus: Upgraded to hirsute on 2021-07-02 (22 days ago)
dmi.bios.date: 05/13/2021
dmi.bios.release: 15.42
dmi.bios.vendor: AMI
dmi.bios.version: F.42
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 86FD
dmi.board.vendor: HP
dmi.board.version: 99.41
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.ec.firmware.release: 99.41
dmi.modalias:
dmi:bvnAMI:bvrF.42:bd05/13/2021:br15.42:efr99.41:svnHP:pnHPLaptop15s-eq0xxx:pvr:rvnHP:rn86FD:rvr99.41:cvnHP:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV HP Notebook
dmi.product.name: HP Laptop 15s-eq0xxx
dmi.product.sku: 440L6PA#ACJ
dmi.sys.vendor: HP
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: network-manager 1.30.0-1ubuntu3
ProcVersionSignature: Ubuntu 5.11.0-25.27-generic 5.11.22
Uname: Linux 5.11.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Sun Jul 25 11:02:42 2021
InstallationDate: Installed on 2021-07-02 (23 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64
(20210209.1)
IpRoute:
default via 192.168.0.1 dev wlo1 proto dhcp metric 600
169.254.0.0/16 dev wlo1 scope link metric 1000
192.168.0.0/24 dev wlo1 proto kernel scope link src 192.168.0.197 metric 600
ProcEnviron:
LANGUAGE=en_IN:en
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_IN
SHELL=/bin/bash
SourcePackage: network-manager
UpgradeStatus: Upgraded to hirsute on 2021-07-02 (22 days ago)
nmcli-dev:
DEVICE TYPE STATE IP4-CONNECTIVITY IP6-CONNECTIVITY DBUS-PATH
CONNECTION CON-UUID
CON-PATH
wlo1 wifi connected full limited
/org/freedesktop/NetworkManager/Devices/2 Crossroads
d93b8f67-7406-4281-9760-aa0b846ed809
/org/freedesktop/NetworkManager/ActiveConnection/4
lo loopback unmanaged unknown unknown
/org/freedesktop/NetworkManager/Devices/1 -- --
--
nmcli-nm:
RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI
WWAN-HW WWAN
running 1.30.0 connected started full enabled enabled
enabled enabled disabled
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug hirsute wayland-session
--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1937927
Title:
Realtek 8821C PCIe Wifi driver problem, wifi speed very slow on
connecting to 2.4ghz network.
Status in network-manager package in Ubuntu:
New
Bug description:
I am using the Realtek 8821C PCIE Wifi driver that is provided in the
Additional drivers app of Ubuntu. When I connect to a 2.4 ghz network,
the internet speed is very slow, it rarely goes above 4mbps. But the
driver works fine when connected to a 5ghz network, easily reaching
speeds of over 80mbps. I don't think it is a problem of my wifi router
because in Windows OS running on the same laptop, I mostly get speeds
of around 40mbps when connected to the 2.4 ghz network.
1. What is the full computer model number?
Ans: HP Laptop 15s-eq0500AU.
2. If you update your BIOS to the newest version following the guide here,
does this change anything?
Ans: No.
3. Regarding your wireless Access Point (WAP):
3c. What wireless connection type are you using (802.11ac, 802.11n 150/300,
802.11g, etc.)?
Ans: 802.11n
3d. If you switch to a different wireless type (802.11g or 802.11n if you are
using 802.11g) does this change anything?
Ans: Yes, in the 5ghz 802.11ac type, the speed is very normally very good.
3f. In order to understand the wireless environment your WAP is working in,
please provide the output of the following terminal command:
sudo iw dev wlan0 scan | grep -i "ds parameter set"
Ans: [sudo] password for soumadeepsarkar1:
command failed: No such device (-19)
Output of
sudo iw dev wlo1 scan | grep -i "ds parameter set"
DS Parameter set: channel 11
DS Parameter set: channel 149
DS Parameter set: channel 149
DS Parameter set: channel 11
DS Parameter set: channel 2
DS Parameter set: channel 6
DS Parameter set: channel 10
DS Parameter set: channel 1
DS Parameter set: channel 7
DS Parameter set: channel 13
DS Parameter set: channel 1
DS Parameter set: channel 1
DS Parameter set: channel 4
DS Parameter set: channel 3
DS Parameter set: channel 10
3g. What encryption type are you using (ex. WEP, WPA2-PSK, etc.)?
Ans: WPA2-PSK
3o. What frequency are you using (2.4GHz, 5GHz, etc.)?
Ans: 2.4 GHz
3p. If you change frequency does it change anything?
Ans: Yes, speed is good in 5ghz
4. Does another wireless device tested with the WAP have the same problem as
the hardware you initially reported with?
Ans: No.
5. What is the distance of the wireless device from the WAP?
Ans: 6 metre
6. What is the number and type of obstructions between your device and the
WAP?
Ans: 2
6a. If you bring the device close to the WAP and eliminate obstructions, does
this change anything?
Ans: No
7. Does the issue occur with different WAPs?
Ans: Yes
8. Is it a regression (i.e. did the problem happen in a prior Ubuntu
release)? If so, what release specifically did it last work with? If you do not
know, could you please test for this in the earliest release of Ubuntu that is
supported as per Ubuntu Releases?
Ans: I don't know if it is a regression and I cannot test for this in another
release of Ubuntu.
9. Does this problem occur in the newest mainline kernel following
https://wiki.ubuntu.com/Kernel/MainlineBuilds? Please mention what specific
version of the mainline kernel you tested with in your report.
Ans: Kernel version: 5.11.0-25-generic
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: linux-image-5.11.0-25-generic 5.11.0-25.27
ProcVersionSignature: Ubuntu 5.11.0-25.27-generic 5.11.22
Uname: Linux 5.11.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: soumadeepsarkar1 1797 F.... pulseaudio
/dev/snd/controlC0: soumadeepsarkar1 1797 F.... pulseaudio
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Sun Jul 25 10:11:55 2021
InstallationDate: Installed on 2021-07-02 (23 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64
(20210209.1)
MachineType: HP HP Laptop 15s-eq0xxx
ProcEnviron:
LANGUAGE=en_IN:en
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_IN
SHELL=/bin/bash
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-25-generic
root=UUID=2d1ce438-fd55-446d-8d61-e2d579055204 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.11.0-25-generic N/A
linux-backports-modules-5.11.0-25-generic N/A
linux-firmware 1.197.2
SourcePackage: linux
UpgradeStatus: Upgraded to hirsute on 2021-07-02 (22 days ago)
dmi.bios.date: 05/13/2021
dmi.bios.release: 15.42
dmi.bios.vendor: AMI
dmi.bios.version: F.42
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 86FD
dmi.board.vendor: HP
dmi.board.version: 99.41
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.ec.firmware.release: 99.41
dmi.modalias:
dmi:bvnAMI:bvrF.42:bd05/13/2021:br15.42:efr99.41:svnHP:pnHPLaptop15s-eq0xxx:pvr:rvnHP:rn86FD:rvr99.41:cvnHP:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV HP Notebook
dmi.product.name: HP Laptop 15s-eq0xxx
dmi.product.sku: 440L6PA#ACJ
dmi.sys.vendor: HP
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: network-manager 1.30.0-1ubuntu3
ProcVersionSignature: Ubuntu 5.11.0-25.27-generic 5.11.22
Uname: Linux 5.11.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Sun Jul 25 11:02:42 2021
InstallationDate: Installed on 2021-07-02 (23 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64
(20210209.1)
IpRoute:
default via 192.168.0.1 dev wlo1 proto dhcp metric 600
169.254.0.0/16 dev wlo1 scope link metric 1000
192.168.0.0/24 dev wlo1 proto kernel scope link src 192.168.0.197 metric 600
ProcEnviron:
LANGUAGE=en_IN:en
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_IN
SHELL=/bin/bash
SourcePackage: network-manager
UpgradeStatus: Upgraded to hirsute on 2021-07-02 (22 days ago)
nmcli-dev:
DEVICE TYPE STATE IP4-CONNECTIVITY IP6-CONNECTIVITY DBUS-PATH
CONNECTION CON-UUID
CON-PATH
wlo1 wifi connected full limited
/org/freedesktop/NetworkManager/Devices/2 Crossroads
d93b8f67-7406-4281-9760-aa0b846ed809
/org/freedesktop/NetworkManager/ActiveConnection/4
lo loopback unmanaged unknown unknown
/org/freedesktop/NetworkManager/Devices/1 -- --
--
nmcli-nm:
RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW
WIFI WWAN-HW WWAN
running 1.30.0 connected started full enabled enabled
enabled enabled disabled
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1937927/+subscriptions
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