** Description changed: 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 + 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 + 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 + 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
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1937926 Title: Realtek 8821C PCIe Wifi driver problem, wifi speed very slow on connecting to 2.4ghz network. Status in linux 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1937926/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
