Public bug reported:
Regression confirmed by A/B test on identical hardware:
kernel 7.0.0-38 works perfectly, 7.0.0-42 fails consistently.
Hardware: Acer Aspire A315-54
Bluetooth ID 04ca:3015: Qualcomm, HCI 4.2, USB bus (hci0), BD_ADDR
a4:63:a1:24:ac:da
WiFi/BT combo chip: Qualcomm QCA9377 (ath10k_pci 0000:01:00.0)
Controller: Sony DualShock 4 (054C:09CC), hw_version=0x0000b408,
fw_version=0x0000a00a, connected via Bluetooth
Kernel affected: 7.0.0-42-generic
Kernel working: 7.0.0-38-generic
Symptom:
After upgrading from 7.0.0-38 to 7.0.0-42, the DualShock 4 over Bluetooth
shows severe input lag and stuck inputs (character keeps moving in one
direction, attacks repeat without release). Occurs in 100% of gaming
sessions, typically within 5-10 minutes of connecting. The same controller
works perfectly over USB on both kernels.
Relevant dmesg on 7.0.0-42:
Bluetooth: Unexpected start frame (len 83)
Bluetooth: Frame is too long (len 83, expected len 81)
playstation 0005:054C:09CC.0006: DualShock4 input CRC's check failed
playstation 0005:054C:09CC.0005: unknown main item tag 0x0
Note: the machine uses Ethernet only; WiFi is not connected, but the
QCA9377 combo chip still reports PCIe correctable errors:
ath10k_pci 0000:01:00.0: PCIe Bus Error: severity=Correctable,
type=Physical Layer, [8] Rollover, [12] Timeout
Steps to reproduce:
1. Boot kernel 7.0.0-42
2. Pair DualShock 4 via Bluetooth
3. Open any game (tested with Ravenswatch on Steam)
4. Observe input lag and stuck inputs within minutes
Already ruled out:
- btusb autosuspend (disabled via modprobe.d, no change)
- Bluetooth link policy SNIFF (cleared via hcitool, no change)
- Steam Input (same behavior with it on and off)
- Reloading hid_playstation module (no change)
- Re-pairing the controller (temporary fix only, bug returns)
- WiFi interference (machine uses Ethernet only)
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-42-generic 7.0.0-42.42
ProcVersionSignature: Ubuntu 7.0.0-42.42-generic 7.0.14
Uname: Linux 7.0.0-42-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: fe-pichorz 2900 F.... wireplumber
/dev/snd/seq: fe-pichorz 2878 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Fri Oct 30 23:40:08 2026
InstallationDate: Installed on 2025-09-05 (420 days ago)
InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Release amd64 (20250415.3)
IwDevWlp1s0Link: Not connected.
MachineType: Acer Aspire A315-54
ProcEnviron:
LANG=pt_BR.UTF-8
PATH=(custom, user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-42-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash video=eDP-1:d
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-05-17 (167 days ago)
dmi.bios.date: 06/23/2020
dmi.bios.release: 1.11
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.11
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Sleepy_WC
dmi.board.vendor: CML
dmi.board.version: V1.11
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.11
dmi.ec.firmware.release: 1.4
dmi.modalias:
dmi:bvnInsydeCorp.:bvrV1.11:bd06/23/2020:br1.11:efr1.4:svnAcer:pnAspireA315-54:pvrV1.11:rvnCML:rnSleepy_WC:rvrV1.11:cvnAcer:ct10:cvrV1.11:sku0000000000000000:pfaAspire3:
dmi.product.family: Aspire 3
dmi.product.name: Aspire A315-54
dmi.product.sku: 0000000000000000
dmi.product.version: V1.11
dmi.sys.vendor: Acer
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2172650
Title:
Bluetooth: "Unexpected start frame (len 83)" and "Frame is too long"
with DualShock 4 on kernel 7.0.0-42 (regression from 7.0.0-38)
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