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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1775124/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
