Package: bluez Version: 5.50-1 Severity: normal Dear Maintainer,
I have found that there is a significant latency in the coming button-press if a bluetooth joypad is inactive for more than around 3 seconds. This latency seem to vary up to until 500 ms. I suspect it is a driver issue because I have tried with multiple gamepads (8bitdo SF30 Pro and Bounabay Wee 2) and multiple bluetooth dongles (IOGEAR Bluetooth 4.0 USB Micro Adapter and Plugable USB-BT4LE USB Bluetooth 4.0 Low Energy Micro Adapter) and the issue remains exactly the same. I have also tried with multiple programs and the issue remains the same (chromium at https://html5gamepad.com and retroarch). However, the issue is not there when a controller is connected via USB. However, I have discovered a workaround. If I connect a wireless headset that continuously plays audio the latency does not happen. Could the issue be that the driver goes into sleep mode when it has been inactive for a few seconds and then stops checking bluetooth signals for up to 500 ms? This would exsplain the headset behaiour as the headset would continuously wake up the driver. If it matters, I used blueman-manager to pair and connect the controllers. *** Reporter, please consider answering these questions, where appropriate *** * What led up to the situation? * What exactly did you do (or not do) that was effective (or ineffective)? * What was the outcome of this action? * What outcome did you expect instead? *** End of the template - remove these template lines *** -- System Information: Debian Release: 10.0 APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.19.0-5-amd64 (SMP w/4 CPU cores) Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages bluez depends on: ii dbus 1.12.16-1 ii kmod 26-1 ii libasound2 1.1.8-1 ii libc6 2.28-10 ii libdbus-1-3 1.12.16-1 ii libdw1 0.176-1.1 ii libglib2.0-0 2.58.3-2 ii libreadline7 7.0-5 ii libudev1 241-5 ii lsb-base 10.2019051400 ii udev 241-5 bluez recommends no packages. Versions of packages bluez suggests: ii pulseaudio-module-bluetooth 12.2-4 -- Configuration Files: /etc/bluetooth/input.conf changed: [General] UserspaceHID=true /etc/bluetooth/main.conf changed: [General] FastConnectable = true [Policy] AutoEnable=true -- no debconf information
