5.4.0-24.28 does not seem to apply rtprio, whereas -21 does.
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
Impact:
Software that requires RT priority is not working anymore since we turned on RT_GROUP_SCHED:
commit 9b039fc517876d3
Author: Seth Forshee <email address hidden>
Date: Mon Apr 6 07:11:44 2020 -0500
UBUNTU: [Config] CONFIG_
This is wanted by docker, and the original reason for disabling
it no longer applied. Performance testing shows no noticible
impact when the option is enabled.
We already hit this issue in the past (see https:/
Fix:
Apply the attached patch
Regression potential:
None, only -lowlatency is impacted, -generic doesn't change.
--
I'm using the xwax package on a Dell XPS 13 (9370) 20.04, which requires rtprio privileges:
[daniel@reef ~ ]$ sudo cat /etc/security/
@audio - rtprio 99
[daniel@reef ~ ]$
This worked fine for the past releases of Ubuntu up until the move from linux-image-
Today I'm seeing:
Launching realtime thread to handle devices...
sched_setscheduler: Operation not permitted
Failed to get realtime priorities
Booting the previous kernel makes it work.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-
ProcVersionSign
Uname: Linux 5.4.0-24-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CasperMD5CheckR
CurrentDesktop: ubuntu:GNOME
Date: Thu Apr 16 18:57:21 2020
InstallationDate: Installed on 2018-04-14 (733 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180409)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 0489:e0a2 Foxconn / Hon Hai
Bus 001 Device 002: ID 0bda:58f4 Realtek Semiconductor Corp. Integrated_
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. XPS 13 9370
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.187
SourcePackage: linux
UpgradeStatus: Upgraded to focal on 2020-03-08 (39 days ago)
dmi.bios.date: 02/21/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.2.1
dmi.board.name: 0F6P3V
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.
dmi.product.family: XPS
dmi.product.name: XPS 13 9370
dmi.product.sku: 07E6
dmi.sys.vendor: Dell Inc.
description: | updated |
tags: | added: patch |
Changed in linux (Ubuntu): | |
status: | Confirmed → Fix Committed |
This change was made by a bot.