Re: Mouse clicks "delayed" until movement

Alexander V. Makartsev Fri, 24 Apr 2026 10:59:53 -0700

On 4/24/26 20:00, Stefan Monnier wrote:

Since last reboot, my trusty laptop has the following annoying behavior:
mouse clicks don't take effect until the next event (typically moving
the mouse).


I checked with `xev` and indeed after a mouse click I see the following
output:

     [...]

     MotionNotify event, serial 35, synthetic NO, window 0x3800001,
         root 0xf6, subw 0x0, time 21834559, (83,68), root:(369,570),
         state 0x0, is_hint 0, same_screen YES

ButtonPress event, serial 35, synthetic NO, window 0x3800001,

         root 0xf6, subw 0x0, time 21836087, (83,68), root:(369,570),
         state 0x0, button 1, same_screen YES

and it sits there without showing any "ButtonRelease" even though
I definitely released the mouse button.  When I then press a key
I finally see the ButtonRelease followed by the key press/release:

     ButtonRelease event, serial 35, synthetic NO, window 0x3800001,
         root 0xf6, subw 0x0, time 21837777, (83,68), root:(369,570),
         state 0x100, button 1, same_screen YES

KeyPress event, serial 35, synthetic NO, window 0x3800001,

         root 0xf6, subw 0x0, time 21837777, (83,68), root:(369,570),
         state 0x0, keycode 111 (keysym 0xff52, Up), same_screen YES,
         XLookupString gives 0 bytes:
         XmbLookupString gives 0 bytes:
         XFilterEvent returns: False

KeyRelease event, serial 38, synthetic NO, window 0x3800001,

         root 0xf6, subw 0x0, time 21837880, (83,68), root:(369,570),
         state 0x0, keycode 111 (keysym 0xff52, Up), same_screen YES,
         XLookupString gives 0 bytes:
         XFilterEvent returns: False

Any idea where the problem might be coming from, how to track it down,
or (even better) fix it?

This is a Thinkpad T61 running Debian testing, with XFCE running
on Xorg.


=== Stefan

The funky behavior like this almost always leads to some buggypower-saving feature.

Try to disable power-saving within a kernel module which your mouse use.
If it is on usb bus:
$ echo -1 | sudo tee /sys/module/usbcore/parameters/autosuspend


--

 With kindest regards, Alexander.

 Debian - The universal operating system
 https://www.debian.org

Re: Mouse clicks "delayed" until movement

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