Public bug reported:
An intermittent but very repeatable problem has started occurring upon
upgrading from Ubuntu 16.10 (kernel 4.8) to Kubuntu 17.04 (kernel 4.10).
After about 10 to 30 minutes the wireless network will stop working. The
network manager will still report that the network is "connected" but
all network requests will timeout. This problem occurs only with the
wireless network and not the wired ethernet connection. After walking
through the kernel bug reporting instructions
(https://wiki.ubuntu.com/Kernel/LinuxWireless) I found that turning off
"802.11n/EWC" in my router solves the problem. I have logged this as a
problem with the kernel since it appears to be specific to my hardware.
Please correct me if this was an incorrect assumption.
Attached is two samples of the system log (obtained using KSystemLog) after
running through the following method twice:
1. Restart computer.
2. Browse the web until problem occurs (about 10 to 30 minutes)
3. Save system log.
Here is the hardware info from `lshw -c network`:
*-network
description: Wireless interface
product: RTL8821AE 802.11ac PCIe Wireless Network Adapter
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlp3s0
version: 00
serial: 6e:77:8e:04:bf:fb
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtl8821ae
driverversion=4.10.0-19-generic firmware=N/A ip=192.168.0.4 latency=0 link=yes
multicast=yes wireless=IEEE 802.11
resources: irq:50 ioport:3000(size=256) memory:b2000000-b2003fff
Here is my full answers to the questions asked in
https://wiki.ubuntu.com/Kernel/LinuxWireless:
Q: What is the full computer model number (ex. HP G32-301TX Notebook PC)?
A: ASUSPRO P2520LA
https://www.asus.com/au/Commercial-Notebooks/ASUSPRO-P2520LA/overview/
Q: If you update your BIOS to the newest version following the guide here, does
this change anything?
A: No
Regarding your wireless Access Point (AP):
Q: 3a. What is the current AP manufacturer, full model, revision, and
firmware version?
A: Board ID: F@ST3864V2
Symmetric CPU Threads: 2
HardWare Version: 253561846
Serial Number: N7161262J001520
Mac Address: 88:a6:c6:8b:b5:72
Build Timestamp: 160325_1801
Software Version: 8.353.1_F@ST5350_Optus
Bootloader (CFE) Version: 8.337
DSL PHY and Driver Version: A2pv6F039p.d26b
Wireless Driver Version: 6.37.14.4803.cpe4.14L04.0-kdb
Voice Service Version: Voice
Manufacturer: Sagecom
Q: 3b. If you update the AP to the latest firmware does it change anything?
A: No
Q: 3c. What wireless connection type are you using (802.11ac, 802.11n
150/300, 802.11g, etc.)?
A: I think 802.11n given that "802.11n/EWC" option in router is set to
"Auto".
3d. If you switch to a different wireless type (802.11g or 802.11n if you
are using 802.11g) does this change anything?
A: Yes. The problem is solved when "802.11n/EWC" is set to "Disabled".
Q: 3e. What channel specifically are you using when this problem is
reproducible?
A: It doesn't seem to depend on the channel but the router commonly chooses
channel 6 and 11.
Q: 3f. In order to understand the wireless environment your AP is
working in, please provide the output of the following terminal command:
sudo iw dev wlan0 scan | grep -i "ds parameter set"
A:
DS Parameter set: channel 11
DS Parameter set: channel 11
DS Parameter set: channel 1
DS Parameter set: channel 1
DS Parameter set: channel 11
DS Parameter set: channel 1
Q: 3g. What encryption type are you using (ex. WEP, WPA2-PSK, etc.)?
A: WPA2-PSK
Q: 3h. If you change and remove encryption entirely does this change
anything?
A: I don't think so. I can repeat my testing if certainty is required on
this one.
Q: 3i. Do you have QoS (Quality of Service)/WMM (Wi-Fi Multimedia) enabled?
A: Yes (It is set to "Auto").
Q: 3j. If you disable/enable QoS/WMM does it change anything?
A: No.
Q: 3k. What is the current beacon interval (usually default is 100)?
A: 100
Q: 3l. If you adjust this to 50 does it change anything?
A: I didn't test this one.
Q: 3m. Does your AP have a firewall enabled?
A: A typical home router NAT setup. Firewall for inbound, no firewall for
outbound.
Q: 3n. If you enable/disable the firewall does it change anything?
A: I didn't test this one.
Q: 3o. What frequency are you using (2.4GHz, 5GHz, etc.)?
A: 2.4GHz
Q: 3p. If you change frequency does it change anything?
A: I only have 2.4GHz available. I didn't test changing channels.
Q: Does another wireless device tested with the AP have the same problem as the
hardware you initially reported with?
A: No other device has problems (Other devices are windows and android
systems). There are no other linux systems in the household.
Q: What is the distance of the wireless device from the AP?
A: 5 meters
Q: What is the number and type of obstructions between your device and the AP?
A: A corner (brick wall)
Q: 6a. If you bring the device close to the AP and eliminate obstructions,
does this change anything?
A: I don't think so.
Q: Does the issue occur with different APs?
A: I didn't test this. I could test this if needed.
Q: 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?
A: There is no problem when using Ubuntu 16.10 or 16.04.
Q: Could you please test upstream's compat-wireless backports via
https://wiki.ubuntu.com/Kernel/LinuxWireless#Compat-wireless_from_upstream?
Please mention in your report the specific version you tested.
A: I haven't done this. I will have to learn how to install a kernel without
the repo. I can do this if this is important. I did try to install the newest
RTL8821AE driver from https://github.com/lwfinger/rtlwifi_new using the method
described in
https://medium.com/@elmaxx/rtl8821ae-wifi-drivers-in-ubuntu-16-04-4c1286524afa.
Q: If the above backport did work, 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.
Q: If the mainline works, does either the development release or the
Ubuntu provided stable compat-wireless backport work following
https://wiki.ubuntu.com/Kernel/LinuxWireless#Compat-wireless_in_Ubuntu?
Please mention in your report the specific version you tested.
Only for Realtek wireless chipsets:
Q: 13a. Does disabling the firmware power management change
anything? This may be done via a terminal:
sudo nano /etc/modprobe.d/DRIVER.conf
options DRIVER ips=0 fwlps=0
where DRIVER is the kernel driver in use for your card found by
executing at a terminal:
lspci -v
A: I did try turning off power management via the NetworkManager. If
needed I can repeat using this method as well.
Q: 13b. Does the upstream proprietary Realtek driver downloaded from
http://www.realtek.com.tw work? Please mention what specific version of the
drivers you tested with in your report. If it doesn't work, please contact the
card vendor, for example ASUS (not Realtek), file a case number requesting the
driver be fixed, and post the case number to your report.
A: I couldn't find a linux driver from Realtek for the RTL8821AE. I needed
I could contact ASUS or Realtek about this.
ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: linux-image-4.10.0-19-generic 4.10.0-19.21 [modified:
boot/vmlinuz-4.10.0-19-generic]
ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
Uname: Linux 4.10.0-19-generic x86_64
ApportVersion: 2.20.4-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: matt 1309 F.... pulseaudio
/dev/snd/controlC0: matt 1309 F.... pulseaudio
Date: Fri Apr 21 20:32:01 2017
InstallationDate: Installed on 2017-04-14 (7 days ago)
InstallationMedia: Kubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
MachineType: ASUSTeK COMPUTER INC. P552LA
ProcEnviron:
LANGUAGE=en_AU:en
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_AU.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-19-generic.efi.signed
root=UUID=3b637a76-ca13-4a29-969a-e4ad7dd2abb4 ro quiet splash vt.handoff=7
PulseList:
Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not
accessible: Permission denied
No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-4.10.0-19-generic N/A
linux-backports-modules-4.10.0-19-generic N/A
linux-firmware 1.164
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/11/2016
dmi.bios.vendor: ASUSTeK COMPUTER INC.
dmi.bios.version: P552LA.207
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: P552LA
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnASUSTeKCOMPUTERINC.:bvrP552LA.207:bd05/11/2016:svnASUSTeKCOMPUTERINC.:pnP552LA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnP552LA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: P552LA
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug zesty
** Attachment added: "An archive of two system logs after problem occured"
https://bugs.launchpad.net/bugs/1685190/+attachment/4865990/+files/failure-logs.tar.gz
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https://bugs.launchpad.net/bugs/1685190
Title:
Intermittent wireless network problem with RTL8821AE and 802.11n/EWC
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