Bug 48855

Summary:	Scrolling tends to "coast"
Product:	xorg	Reporter:	Gavin Troy <gavtroy>
Component:	Input/synaptics	Assignee:	Peter Hutterer <peter.hutterer>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	thomas
Version:	git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Gavin Troy 2012-04-17 21:52:35 UTC

Scrolling now has a strong tendency to "coast" when finger is lifted. Applies to both edge scrolling and two-finger scrolling.

Just to be clear, this is nothing to do with the coasting feature (which I have disabled).

5a1612d4496b51682c9043aa064025c545249de6 introduces this issue.

Comment 1 Thomas Wouters 2012-04-18 02:35:34 UTC

(In reply to comment #0)
> Just to be clear, this is nothing to do with the coasting feature (which I have
> disabled).

Not sure what you mean with having it disabled, but I noticed that after installing xf86-input-synaptics 1.5.99.903 there seems to happen some coasting while scrolling which disappears after setting either of these:

synclient CoastingSpeed=0 (disables coasting completely)
synclient CornerCoasting=1 (stops unintentional coasting, but enables CornerCoasting)

Comment 2 Gavin Troy 2012-04-18 07:23:13 UTC

(In reply to comment #1)
> Not sure what you mean with having it disabled

I wasn't very clear there. I only meant that CornerCoasting was unset.

> synclient CoastingSpeed=0 (disables coasting completely)
> synclient CornerCoasting=1 (stops unintentional coasting, but enables
> CornerCoasting)

Setting either of these also stops the unintentional coasting for me.

Comment 3 Peter Hutterer 2012-04-18 15:05:40 UTC

Please try from git, 1c155f644824133315ac5b3dac9076db71430eb6 should have fixed this issue.

Comment 4 Gavin Troy 2012-04-18 18:10:53 UTC

For me this seems fixed. The behaviour is more or less back to how it was a month ago, when there was a reasonable amount of kinetic scrolling.

It seems that the CornerCoasting setting has always affected this behaviour. This seems odd to me, but it's probably of little relevance to this bug.

Comment 5 Peter Hutterer 2012-04-18 18:38:19 UTC

Thanks, closing as per comment #4.

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