Hi, I've got an Apple Magicmouse, bluetooth mouse, and it frequently disconnects on linux, more than a dozen times per day, even more than a dozen times per hour sometimes. This happens on an hp laptop, and a Mac laptop running linux (specifically Fedora). When rebooted to Windows 10 and macOS respectively, the mouse works as expected without disconnects. It happens on kernels going back before 4.9 and up to current 5.2rc5 kernels, and is not a regression near as I can tell. Someone else discovered that if CONFIG_HID_BATTERY_STRENGTH is not set, the problem doesn't happen. I can confirm this, but as a consequence I no longer get any battery remaining information which is suboptimal. https://bugzilla.kernel.org/show_bug.cgi?id=103631 So I'm wondering what more information I can provide to figure out why polling the mouse (apparently) causes these disconnects. I never see a kernel message related to the disconnect, only after the reconnect happens. [ 1367.387984] flap.local kernel: magicmouse 0005:05AC:030D.0004: unknown main item tag 0x0 [ 1367.388472] flap.local kernel: input: mouses as /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/bluetooth/hci0/hci0:512/0005:05AC:030D.0004/input/input20 [ 1367.391109] flap.local kernel: magicmouse 0005:05AC:030D.0004: input,hidraw2: BLUETOOTH HID v3.06 Mouse [mouses] on 00:c2:c6:f0:52:57 Hp test system: hci0: Type: Primary Bus: USB BD Address: 00:C2:C6:F0:52:57 ACL MTU: 1021:4 SCO MTU: 96:6 UP RUNNING PSCAN RX bytes:15083 acl:0 sco:0 events:2439 errors:0 TX bytes:600912 acl:0 sco:0 commands:2437 errors:0 Features: 0xbf 0xfe 0x0f 0xfe 0xdb 0xff 0x7b 0x87 Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 Link policy: RSWITCH SNIFF Link mode: SLAVE ACCEPT Name: 'flap.local' Class: 0x0c010c Service Classes: Rendering, Capturing Device Class: Computer, Laptop HCI Version: 4.2 (0x8) Revision: 0x100 LMP Version: 4.2 (0x8) Subversion: 0x100 Manufacturer: Intel Corp. (2) Apple Magic Mouse (original, not the 2) Originally sent to linux-bluetooth, suggestion made to post here instead. https://lore.kernel.org/linux-bluetooth/61972141474cad5b43af0808fa701b0adff12971.camel@xxxxxxxxxx/T/#t -- Chris Murphy
