Summary; my own rtl8821ae frequent connection lost problem was fixed by
upstream patch b8b8b16352cd ("rtlwifi: rtl8821ae: Fix connection lost
problem") merged for 4.14-rc4.
I've recently fixed a problem very much like the problems reported in
this bug; and during my tests I saw the cycling ping times, the delay
unloading the module, and the no buffer space, all of which suggested a
firmware hang in the wireless device.
My main problem was that connection was lost shortly after it was made,
and especially if there was a burst of download data. Workaround was to
turn wireless off then on again, or reboot.
What I did was
(a) test several ubuntu kernels to find which ones were affected,
(b) using git bisect, tested several custom kernels, and proved my
problem began with a single commit 40b368af4b75 ("rtlwifi: Fix alignment
issues"),
(c) worked with upstream to determine a likely cause; the commit wasn't
widely tested,
(d) proved through testing that the BIOS can have an effect; because the
rtl8821ae driver does not reset the card, but inherits the card in
whatever state the BIOS left it. This can randomise problem reports.
(e) proved that a power down and reboot can have a different effect to a
warm reboot; some of the wireless card device registers are unchanged on
warm reboot. This can randomise problem reports.
Hope that helps.
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https://bugs.launchpad.net/bugs/1618267
Title:
RTL8821AE abruptly halts all network traffic
Status in linux package in Ubuntu:
Triaged
Bug description:
Computer: Lenovo IdeaPad 110
WiFi AP: Linksys E2500 v1.0 with firmware v2.0.00
After a few minutes of mixed Internet use, the WiFi hangs and the
interface ceases to pass traffic:
64 bytes from 8.8.8.8: icmp_seq=281 ttl=55 time=12.8 ms
64 bytes from 8.8.8.8: icmp_seq=282 ttl=55 time=12.5 ms
64 bytes from 8.8.8.8: icmp_seq=283 ttl=55 time=58.4 ms
64 bytes from 8.8.8.8: icmp_seq=284 ttl=55 time=68.0 ms
64 bytes from 8.8.8.8: icmp_seq=285 ttl=55 time=65.6 ms
ping: sendmsg: No buffer space available
ping: sendmsg: No buffer space available
ping: sendmsg: No buffer space available
^C
--- 8.8.8.8 ping statistics ---
314 packets transmitted, 283 received, 9% packet loss, time 366615ms
rtt min/avg/max/mdev = 11.423/177.382/7227.733/806.648 ms, pipe 8
Before the driver hangs, speeds are 30/5 Mbps despite a 75 Mbps WiFi
transmit rate and a 70/70 Mbps symmetrical fiber connection in the
house. The connection and the router are known to perform better than
this with other equipment.
Forcing the router into 802.11g mode does, at least at a cursory
glance, seem to mitigate the halting problem, but speeds remain
abysmal.
If there is any kind of technically involved tests I can do to speed
up the debugging of this problem, let me know. I have some experience
with embedded development in C.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-34-generic 4.4.0-34.53
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: thor 3179 F.... pulseaudio
/dev/snd/controlC0: thor 3179 F.... pulseaudio
CurrentDesktop: Unity
Date: Tue Aug 30 01:36:22 2016
HibernationDevice: RESUME=UUID=a482ae0a-dd87-41de-be2c-50541edcfa53
InstallationDate: Installed on 2016-08-29 (0 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64
(20160719)
MachineType: LENOVO 80TJ
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-34-generic.efi.signed
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.4.0-34-generic N/A
linux-backports-modules-4.4.0-34-generic N/A
linux-firmware 1.157.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/24/2016
dmi.bios.vendor: Lenovo
dmi.bios.version: 1QCN16WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Nano 5A8
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40700 WIN
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo ideapad 110-15ACL
dmi.modalias:
dmi:bvnLenovo:bvr1QCN16WW:bd03/24/2016:svnLENOVO:pn80TJ:pvrLenovoideapad110-15ACL:rvnLENOVO:rnNano5A8:rvrSDK0J40700WIN:cvnLENOVO:ct10:cvrLenovoideapad110-15ACL:
dmi.product.name: 80TJ
dmi.product.version: Lenovo ideapad 110-15ACL
dmi.sys.vendor: LENOVO
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