This bug was fixed in the package linux - 5.4.0-26.30
---------------
linux (5.4.0-26.30) focal; urgency=medium
* focal/linux: 5.4.0-26.30 -proposed tracker (LP: #1873882)
* Packaging resync (LP: #1786013)
- update dkms package versions
* swap storms kills interactive use (LP: #1861359)
- SAUCE: drm/i915: prevent direct writeback from the shrinker
* 5.4.0-24.28 does not seem to apply rtprio, whereas -21 does. (LP: #1873315)
- [Config] lowlatency: turn off RT_GROUP_SCHED
* [RTL810xE] No ethernet connection (LP: #1871182)
- net: phy: realtek: fix handling of RTL8105e-integrated PHY
-- Andrea Righi <[email protected]> Mon, 20 Apr 2020 18:33:49
+0200
** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1873315
Title:
5.4.0-24.28 does not seem to apply rtprio, whereas -21 does.
Status in linux package in Ubuntu:
Fix Released
Bug description:
Impact:
Software that requires RT priority is not working anymore since we
turned on RT_GROUP_SCHED:
commit 9b039fc517876d312e7fa0955571101a299c91f5
Author: Seth Forshee <[email protected]>
Date: Mon Apr 6 07:11:44 2020 -0500
UBUNTU: [Config] CONFIG_RT_GROUP_SCHED=y
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://bugs.launchpad.net/ubuntu/+source/linux/+bug/1284731), but
nowadays reverting RT_GROUP_SCHED back to off would regress Docker and
since RT privileges are usually required by audio/multimedia software,
it probably make sense to revert this change only for -lowlatency (and
keep the rest as is) and encourage people to use -lowlatency if they
hit this problem.
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/limits.d/audio.conf
@audio - rtprio 99
[daniel@reef ~ ]$
This worked fine for the past releases of Ubuntu up until the move
from linux-image-5.4.0-21-generic to linux-image-5.4.0-24-generic.
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-5.4.0-24-generic 5.4.0-24.28
ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
Uname: Linux 5.4.0-24-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: daniel 2905 F.... pulseaudio
CasperMD5CheckResult: skip
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_Webcam_HD
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=/boot/vmlinuz-5.4.0-24-generic
root=UUID=0af0a12d-3b1e-4708-89c4-73f666ddc618 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.4.0-24-generic N/A
linux-backports-modules-5.4.0-24-generic N/A
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.:bvr1.2.1:bd02/21/2018:svnDellInc.:pnXPS139370:pvr:rvnDellInc.:rn0F6P3V:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 9370
dmi.product.sku: 07E6
dmi.sys.vendor: Dell Inc.
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