My apology, I found the issue is due to canonical-livepatch (which is LTS-only). Issue resolved after removing it.
** Changed in: bluez (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to bluez in Ubuntu. https://bugs.launchpad.net/bugs/1801642 Title: Bluetooth mouse sleep after 5 seconds of inactivity Status in bluez package in Ubuntu: Invalid Bug description: I'm having bluetooth mouse lag issue. After leaving it stationary for 5 seconds, I have to move it for 2 seconds before the pointer starts moving. I recently upgraded to Cosmic 3 days ago (from Bionic). There was no issue in the first 3 days, including after suspend/restart/shutdown. This issue only appears starting today. I tried: 1. Running 'bluetoothctl' and then 'scan off'. The command failed to run with 'Failed to stop discovery: org.bluez.Error.Failed'. 2. modprobe -r btusb, then modprobe it again. 3. sudo sh -c 'echo N > /sys/module/drm_kms_helper/parameters/poll' 4. Disabling wifi. $ apt-cache policy bluez 5.50-0ubuntu1 $uname -a; lspci -nnk | grep -iA2 net; lsusb; dmesg | grep -i bluetooth; dmesg | grep -i firmware; lsmod | grep bluetooth 4.18.0-10-generic #11 02:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 73) Subsystem: Intel Corporation Dual Band Wireless-N 7260 [8086:4460] Kernel driver in use: iwlwifi 03:00.1 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 12) Subsystem: Dell RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1028:05f9] Kernel driver in use: r8169 Kernel modules: r8169 Bus 001 Device 002: ID 8087:8000 Intel Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 003: ID 17e9:4301 DisplayLink Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 002 Device 047: ID 04f3:0206 Elan Microelectronics Corp. Bus 002 Device 006: ID 8087:07dc Intel Corp. Bus 002 Device 034: ID 0461:4d51 Primax Electronics, Ltd 0Y357C PMX-MMOCZUL (B) [Dell Laser Mouse] Bus 002 Device 118: ID 0853:0132 Topre Corporation Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub [ 287.361153] hid-generic 0005:046D:B012.0005: input,hidraw2: BLUETOOTH HID v0.14 Keyboard [MX Master] on FC:F8:AE:33:C7:31 bluetooth 548864 33 btrtl,btintel,btbcm,bnep,btusb,rfcomm ecdh_generic 24576 2 bluetooth ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: bluez 5.50-0ubuntu1 ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12 Uname: Linux 4.18.0-10-generic x86_64 ApportVersion: 2.20.10-0ubuntu13 Architecture: amd64 CurrentDesktop: MATE Date: Mon Nov 5 13:40:01 2018 InstallationDate: Installed on 2018-07-08 (119 days ago) InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) InterestingModules: rfcomm bnep btusb bluetooth MachineType: Dell Inc. Inspiron 7537 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-10-generic root=/dev/mapper/ubuntu--mate--vg-root ro ipv6.disable=1 quiet splash i915.enable_psr=0 SourcePackage: bluez UpgradeStatus: Upgraded to cosmic on 2018-11-02 (3 days ago) dmi.bios.date: 10/31/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A05 dmi.board.name: 07PF9F dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnDellInc.:bvrA05:bd10/31/2013:svnDellInc.:pnInspiron7537:pvr:rvnDellInc.:rn07PF9F:rvrA00:cvnDellInc.:ct8:cvr0.1: dmi.product.family: Shark Bay ULT dmi.product.name: Inspiron 7537 dmi.product.sku: Inspiron 7537 dmi.sys.vendor: Dell Inc. hciconfig: hci0: Type: Primary Bus: USB BD Address: FC:F8:AE:33:C7:31 ACL MTU: 1021:5 SCO MTU: 96:5 UP RUNNING RX bytes:2380 acl:32 sco:0 events:208 errors:0 TX bytes:28560 acl:29 sco:0 commands:170 errors:0 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1801642/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp