So, the main problem has been identified:
In kernel v < 4.19 the "normal" BLE commands work.
In kernel v > 4.19 only the BLE extended (BT 5.0) commands work.
When software relies on the "normal" BLE commands, issues arise when
kernel v > 4.19 is being used.
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** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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its effecting my 20.04 install as well
5.4.0-33-generic
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Title:
update-initramfs complains of missing amdgpu firmware files
Status
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5.6 mainline kernel also does not work.
** Tags added: apport-collected focal
** Description changed:
New bug report for kernel:
After testing Ubuntu 20.04 on my Intel NUC (NUC8i3BEH) I found out, that
Bluetooth (LE) [hardware: Intel Wireless-AC 9560] isn't working; hcitool lescan
reports:
** Package changed: kernel-package (Ubuntu) => linux (Ubuntu)
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Title:
BLE not working; hcitool lescan says 'Set scan parameters fail
** Package changed: kernel-package (Ubuntu) => linux (Ubuntu)
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Title:
Kernel 4.19+: Bluetooth not working; Ubuntu 20.04
Status in l
So, my fault: It IS actually a kernel issue. I didn't install linux-
modules-extra-4.15.0-96-generic package when trying out Ubuntu 18.04
stock kernel on Ubuntu 20.04. After installing this package hcitool
lescan works flawlessly...
** Package changed: bluez (Ubuntu) => kernel-package (Ubuntu)
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Bluetoothctl and blueman are both using LE Extended commands and are
therefor working I think.
(btw: I would edit my comments if I could ...)
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It seems to me that the "normal" LE commands are broken and only the LE
Extended commands are working?
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Title:
hcitool lescan says '
After some time I am back to:
hcitool lescan
Set scan parameters failed: Input/output error
Issuing
hcitool cmd 0x03 0x0003
< HCI Command: ogf 0x03, ocf 0x0003, plen 0
> HCI Event: 0x0e plen 4
02 03 0C 00
helps again, but I still can't find any BLE devices with hcitool lescan.
Nevertheless the
Executing "hcitool cmd 0x03 0x0003" made the error with hcitool disappear:
hcitool lescan
LE Scan ...
But hcitool does not seem to work as I can't find any ble devices.
btmon output after executing "hcitool cmd 0x03 0x0003 and hcitool lescan:
> HCI Event: Command Complete (0x0e) plen 4
Installed blueman for testing purpose (wasn't installed before): it is allowed
to perform these commands:
@ RAW Open: blueman-manager (privileged) version 2.22
{0x0004}
20:43:17.578682
@ RAW Close: blueman-m
After some more investigation I found out that the software I am using
is NOT using hcitool. It really seems to be another problem since the
custom software and the hcitool lescan command are throwing the same
error observed with btmon:
@ RAW Close: hcitool
I also think it's not a kernel issue since bluetoothctl is working and
able to find Bluetooth low energy devices.
Bluez Ubuntu 18.04 version with latest focal kernel also results in:
hcitool lescan
Set scan parameters failed: Input/output error
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On uname -a
Linux xxx 4.15.0-88-generic #88-Ubuntu SMP Tue Feb 11 20:11:34 UTC 2020 x86_64
x86_64 x86_64 GNU/Linux even with up to date focal bluez version the bluetooth
device isn't recognized:
dmesg | grep Bluetooth = empty output
The backup usb bluetooth dongle also doesn't work with this ker
With current Ubuntu 18.04 installed on focal and the current bluez v5.48
(current Ubuntu 18.04 version):
I get the following error:
root@xxx:~# uname -a
Linux xxx 4.15.0-88-generic #88-Ubuntu SMP Tue Feb 11 20:11:34 UTC 2020 x86_64
x86_64 x86_64 GNU/Linux
root@xxx:~# hcitool lescan
Could not open
I tested the following mainline kernels:
Linux xxx 5.3.18-050318-generic #201912181133 SMP Wed Dec 18 16:36:09 UTC 2019
x86_64 x86_64 x86_64 GNU/Linux
root@xxx:~# hcitool lescan
Set scan parameters failed: Input/output error
root@xxx:~# uname -a
Linux xxx 4.15.18-041518-generic #201804190330 SMP
apport information
** Attachment added: "ProcCpuinfo.txt"
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** Attachment removed: "CurrentDmesg.txt"
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apport information
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apport information
** Tags added: apport-collected
** Description changed:
Hi,
after some testing with Ubuntu 20.04 beta I couldn't get hcitool lescan
working. I get the following error:
hcitool lescan
Set scan parameters failed: Input/output error
Bluetooth hardware:
hci
apport information
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Public bug reported:
Hi,
after some testing with Ubuntu 20.04 beta I couldn't get hcitool lescan
working. I get the following error:
hcitool lescan
Set scan parameters failed: Input/output error
Bluetooth hardware:
hci0: Type: Primary Bus: USB
BD Address: 04:EA:56:21:xx:xx ACL MTU:
I can confirm after after 6 days uptime: my hotfix (echo
"vm.min_free_kbytes=67584" > /etc/sysctl.d/60-workaround-kswapd-
allcpu.conf) still works.
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I can the following hotfix works for me for several days on a 2GB Ram
system:
echo "vm.min_free_kbytes=67584" > /etc/sysctl.d/60-workaround-kswapd-
allcpu.conf
after that: reboot.
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I can confirm this bug is only triggered when the machine got 2-3GB RAM
or less. I got two identical machines running Ubuntu 16.04. One got 8Gb
of RAM and on this machine kswapd0 doesn't deadlock at 100% CPU Usage.
On my 2GB RAM machine the issue is worse than under Ubuntu 15.10
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I can also confirm the bug ist still present in Xubuntu 16.04 LTS
desktop
4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64
x86_64 x86_64 GNU/Linux
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*** This bug is a duplicate of bug 1518457 ***
https://bugs.launchpad.net/bugs/1518457
** This bug has been marked a duplicate of bug 1518457
kswapd0 100% CPU usage
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h
*** This bug is a duplicate of bug 1518457 ***
https://bugs.launchpad.net/bugs/1518457
** This bug has been marked a duplicate of bug 1518457
kswapd0 100% CPU usage
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h
*** This bug is a duplicate of bug 1518457 ***
https://bugs.launchpad.net/bugs/1518457
** This bug has been marked a duplicate of bug 1518457
kswapd0 100% CPU usage
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h
*** This bug is a duplicate of bug 1518457 ***
https://bugs.launchpad.net/bugs/1518457
** This bug has been marked a duplicate of bug 1518457
kswapd0 100% CPU usage
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h
*** This bug is a duplicate of bug 1518457 ***
https://bugs.launchpad.net/bugs/1518457
** This bug has been marked a duplicate of bug 1518457
kswapd0 100% CPU usage
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h
*** This bug is a duplicate of bug 1518457 ***
https://bugs.launchpad.net/bugs/1518457
** This bug has been marked a duplicate of bug 1518457
kswapd0 100% CPU usage
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h
As part of my workaround/fix I downgraded udev and upgraded RAM from 3GB
to 8GB on my homeserver.
Now I am experiencing the following which can't be normal either:
top - 13:50:48 up 1 day, 19:29, 1 user, load average: 0,11, 0,15, 0,14
tasks: 200 total, 1 running, 198 sleeping, 0 stopped,
Update: Sadly not fixed for my Home Servers:
top - 19:19:36 up 45 min, 1 user, load average: 3,95, 3,81, 3,46
Aufgaben: 175 total, 4 running, 171 sleeping, 0 stopped, 0 zombie
%Cpu(s): 1,0 be, 44,8 sy, 1,8 ni, 14,3 un, 37,6 wa, 0,0 hi, 0,5 si, 0,0 st
KiB Mem: 1872072 total, 1847332
Seems also to be fixed on my Xubuntu Home Servers. But I will report
back later.
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Title:
kswapd0 100% CPU usage
Status in linux pac
Thanks a lot for your hard work!
I tested it with Amazon EC2 15.10 and it seems that downgrading fixed it.
Now testing my Xubuntu Home Server.
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I really tried hard DD'ing and filling up RAM but I really can not
reproduce the issue under Ubuntu 15.04 on AWS EC2 nano. On my home
server boxes that issue also didn't appear on Ubuntu 15.04 either - so I
really think it was introduced between 15.04 and 15.10.
Linux ip-172-31-7-84 3.19.0-20-gene
I can also confirm the issue on Amazon AWS t2.nano
Linux ip-172-31-5-83 4.2.0-22-generic #27-Ubuntu SMP Thu Dec 17 22:57:08 UTC
2015 x86_64 x86_64 x86_64 GNU/Linux
after DDing a 512Mb file:
top - 18:36:00 up 9 min, 1 user, load average: 1.03, 0.64, 0.30
Tasks: 74 total, 3 running, 71 sleep
Also see here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1476211
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Title:
kswapd0 100% CPU usage
Status in linux package
This bug is also affecting me on 2 (ident) Xubuntu 15.10 systems:
uname -a: ### 4.2.0-22-generic #27-Ubuntu SMP Thu Dec 17 22:57:08 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux
cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=15.10
DISTRIB_CODENAME=wily
DISTRIB_DESCRIPTION="Ubuntu 15.10"
also
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