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Bug 671659 - [3.3.18] generates too many scroll events with a delta of 0
[3.3.18] generates too many scroll events with a delta of 0
Status: RESOLVED FIXED
Product: gtk+
Classification: Platform
Component: Backend: X11
3.3.x
Other Linux
: Normal normal
: ---
Assigned To: gtk-bugs
gtk-bugs
Depends on:
Blocks:
 
 
Reported: 2012-03-08 15:38 UTC by Sebastien Bacher
Modified: 2012-03-09 03:37 UTC
See Also:
GNOME target: 3.4
GNOME version: ---

Attachments
xi2: Don't reset scroll valuators too often (1.08 KB, patch)
2012-03-09 03:37 UTC, Matthias Clasen 		committed Details | Review

Description Sebastien Bacher 2012-03-08 15:38:12 UTC 
Using gtk 3.3.18 scrolling with an usb mouse scroll wheel seems to "skip" events (i.e sometimes scrolling doesn't happen when the wheel turns)

Using GDK_DEBUG=events to get info it seems quite some scroll events are generated with a delta of 0, not sure if that's the cause of the issue though
Comment 1 Sebastien Bacher 2012-03-08 15:39:15 UTC 
i.e log has 

"Gdk-Message: configure notify:	window: 37748847  x,y: 331 793	w,h: 21 68  b-w: 0  above: 19204272	 ovr: 1
Gdk-Message: smooth scroll:	window 37748739
	deltas: 0,000000 0,000000
Gdk-Message: unmap notify:		window: 37748847
Gdk-Message: property notify:	window: 37748739, atom(350): "_NET_WM_USER_TIME"
Gdk-Message: smooth scroll:	window 37748739
	deltas: 0,000000 0,000000
Gdk-Message: property notify:	window: 37748739, atom(350): "_NET_WM_USER_TIME"
Gdk-Message: smooth scroll:	window 37748739
	deltas: 0,000000 0,000000
Gdk-Message: property notify:	window: 37748739, atom(350): "_NET_WM_USER_TIME"
Gdk-Message: smooth scroll:	window 37748739
	deltas: 0,000000 0,000000
..."
Comment 2 Matthias Clasen 2012-03-09 03:37:13 UTC 
The following fix has been pushed:
9d16886 xi2: Don't reset scroll valuators too often
Comment 3 Matthias Clasen 2012-03-09 03:37:16 UTC 
Created attachment 209297 [details] [review]
xi2: Don't reset scroll valuators too often

According to XInput gurus, a motion event without valuators
does not invalidate the stored value, so we should keep it.