I'm not sure if bluez can do anything about this.
First, please check that you haven't left the Bluetooth settings window
open since doing so can cause problems (scanning for new devices limits
bandwidth for existing devices).
There does however seem to be a recurring error in the kernel log:
[ 187.070936] WARNING: CPU: 4 PID: 7854 at net/bluetooth/hci_conn.c:404
hci_conn_timeout+0x112/0x170 [bluetooth]
[ 187.070938] Modules linked in: hidp hid cmac rfcomm bnep overlay pci_stub
vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) intel_rapl
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel binfmt_misc
nls_iso8859_1 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
snd_hda_codec_hdmi snd_soc_skl snd_soc_hdac_hda snd_hda_ext_core
snd_soc_skl_ipc snd_soc_sst_ipc snd_soc_sst_dsp snd_soc_acpi_intel_match
snd_soc_acpi snd_soc_core snd_hda_codec_realtek aesni_intel
snd_hda_codec_generic snd_compress aes_x86_64 ac97_bus crypto_simd cryptd
snd_pcm_dmaengine glue_helper intel_cstate btusb uvcvideo btrtl
videobuf2_vmalloc btbcm videobuf2_memops btintel videobuf2_v4l2
videobuf2_common bluetooth videodev media ecdh_generic snd_hda_intel
snd_hda_codec snd_hda_core snd_seq_midi snd_seq_midi_event intel_rapl_perf
snd_rawmidi snd_hwdep joydev iwlwifi input_leds serio_raw snd_seq snd_pcm
wmi_bmof intel_wmi_thunderbolt thinkpad_acpi nvram cfg80211 ledtrig_audio
snd_seq_device snd_timer mei_me
[ 187.070957] ucsi_acpi processor_thermal_device mei typec_ucsi
intel_soc_dts_iosf intel_pch_thermal idma64 intel_xhci_usb_role_switch typec
snd virt_dma roles soundcore int3403_thermal int340x_thermal_zone
int3400_thermal acpi_thermal_rel acpi_pad mac_hid sch_fq_codel iptable_filter
ip6table_filter ip6_tables br_netfilter bridge stp llc arp_tables parport_pc
ppdev lp parport ip_tables x_tables autofs4 i915 kvmgt vfio_mdev mdev
vfio_iommu_type1 vfio kvm irqbypass i2c_algo_bit drm_kms_helper syscopyarea
sysfillrect sysimgblt nvme fb_sys_fops psmouse e1000e sdhci_pci drm cqhci ahci
nvme_core sdhci intel_lpss_pci libahci intel_lpss wmi video
[ 187.070975] CPU: 4 PID: 7854 Comm: kworker/u17:2 Tainted: G OE
5.0.9-050009-generic #201904200830
[ 187.070975] Hardware name: LENOVO 20LW000YPB/20LW000YPB, BIOS R0QET54W (1.31
) 01/21/2019
[ 187.070985] Workqueue: hci0 hci_conn_timeout [bluetooth]
[ 187.070993] RIP: 0010:hci_conn_timeout+0x112/0x170 [bluetooth]
[ 187.070996] Code: dc 48 8d bb 80 01 00 00 e8 5b 75 98 dc 48 8b 35 3c 6d b2
dd bf 00 20 00 00 48 8d 93 60 01 00 00 e8 c3 06 3a dc e9 59 ff ff ff <0f> 0b e9
16 ff ff ff 48 8b 83 80 04 00 00 4c 89 e9 48 c7 c6 ee 34
[ 187.070997] RSP: 0018:ffffb2154800fe68 EFLAGS: 00010286
[ 187.070998] RAX: ffffffffc0d147f0 RBX: ffff9cb1271ed8e8 RCX: ffff9cb12e8a8820
[ 187.070998] RDX: 0000000000000001 RSI: ffff9cb08708eeb0 RDI: ffff9cb1271ed8e8
[ 187.070999] RBP: ffffb2154800fe80 R08: 0000000000000000 R09: 0000000030696368
[ 187.071000] R10: 8080808080808080 R11: 0000000000000001 R12: 00000000ffffffff
[ 187.071000] R13: ffff9cb1271ed800 R14: ffff9cb1271ed8e8 R15: 0ffff9cb12517da0
[ 187.071001] FS: 0000000000000000(0000) GS:ffff9cb132500000(0000)
knlGS:0000000000000000
[ 187.071002] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 187.071002] CR2: 00007f5f1001bff8 CR3: 000000011a40e005 CR4: 00000000003606e0
[ 187.071003] Call Trace:
[ 187.071007] process_one_work+0x20f/0x410
[ 187.071008] worker_thread+0x34/0x400
[ 187.071010] kthread+0x120/0x140
[ 187.071012] ? process_one_work+0x410/0x410
[ 187.071013] ? __kthread_parkme+0x70/0x70
[ 187.071016] ret_from_fork+0x35/0x40
[ 187.071018] ---[ end trace 4e30755b679676aa ]---
So maybe an improvement could be made in the Intel kernel driver?
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1826516
Title:
bluetooh mouse lag when use bluetooth hedphones
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