Bug 202481

Summary:	the first keystroke of BT-keyboards lost on idle resume
Product:	Drivers	Reporter:	mybigspam
Component:	Bluetooth	Assignee:	linux-bluetooth (linux-bluetooth)
Status:	NEW ---
Severity:	high	CC:	luiz.dentz
Priority:	P1
Hardware:	All
OS:	Linux
URL:	https://www.spinics.net/lists/linux-bluetooth/msg42966.html
Kernel Version:	5.14	Subsystem:
Regression:	No	Bisected commit-id:

Description mybigspam 2019-02-01 02:21:37 UTC

When bluetooth keyboard disconnects itself on 10 min idle timeout(which is normal), the first key press just losses, while the keyboard reconnects successfully. After ~3-5 sec the operation returns to normal.  


It doesn't occurs on the same system with Windows 10 - the key doesn't lost on reconnect.
One of my Android device Asus Zenhone Max with kernel 3.10.108 doesn't have this problem, while the other, Sony Xperia Tablet Z2, with 3.4.0 kernel, suffers from it.

It was reported earlier: https://www.spinics.net/lists/linux-bluetooth/msg42966.html

Please, help investigate the problem - it's really annoying.

Comment 1 mybigspam 2019-02-01 02:59:53 UTC

Also tested on kernels v3.2 (Ubuntu 12.04.1 LTS), v3.13 (Ubuntu 12.04.5 LTS) - the problem still there.
Occurs on different computers, with different BT-adapters (in-built, USB external).

Not sure if it regression or not. Help.