Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.17 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as
"Confirmed".
Thanks in advance.
[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.17
** Package changed: linux-signed (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1775124
Title:
static noise at login and after screen blanking
Status in linux package in Ubuntu:
New
Bug description:
At the login screen, and after screen blanking, there often (but not
always) is loud static noise from the screen's speaker.
In the login-screen, it stops after logging in.
After turning the screen back on after blanking (my system settings
have "Screen energy saving: Switch off after 10 min" set and "Suspend"
disabled), there is the same static noise. One way I found to make is
disappear is to invoke "pavucontrol". As soon as it opens, the noise
is gone.
Seems to me like some gain setting or the like is not properly
(re)initialized after screen blanking. Strangely enough, pavucontrol
seems to fix this by just starting, with no further user interaction.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-22-generic 4.15.0-22.24
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Jun 5 08:01:58 2018
InstallationDate: Installed on 2018-06-01 (3 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64
(20180426)
SourcePackage: linux-signed
UpgradeStatus: No upgrade log present (probably fresh install)
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