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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - The cursor "jump" sometimes"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94910#c18">Comment # 18</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - The cursor "jump" sometimes"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94910">bug 94910</a>
from <span class="vcard"><a class="email" href="mailto:jeremy9856@gmail.com" title="Paviluf <jeremy9856@gmail.com>"> <span class="fn">Paviluf</span></a>
</span></b>
<pre>(In reply to Dudley Du from <a href="show_bug.cgi?id=94910#c17">comment #17</a>)
Hi Dudley,
Thank you for your analysis.
<span class="quote">> To doulbe confirm on these symptoms, could you help double check that if it
> was possible that there was a ghost finger reported even there was no finger
> touch on the trackpad device?</span >
Sorry but I don't know how I can do this.
<span class="quote">> Or could you try to press the trackpad with a non-conductor object on the
> trackpad device, which may help to reproduce the ghost finger issue.
> Because the ghost may appear and disapper by itself, so it seems that the
> ghost finger was on the edge to be triggered or not on the trackpad device.</span >
With a non conductor object the jump doesn't occur but the click is not taken
into account. The click is triggered only when I have something conductor on
the touchpad. If I let a finger on the touchpad and click with a non conductive
thing there is no jump.
I don't know if it's relevant because the jump happen when I move the cursor
with the right finger, quickly release it and click with the left finger.
<span class="quote">> If the ghost finger happened on the trackpad device, it may indicate the
> hardware has been broken. For example, in the manufacture, there is a
> foreign matter or air was brought in between the malar and the PCB. Or some
> other factors, that has affect the sensors on the fixed area.</span >
I would say that is, even if it's possible, very unlikely.
<span class="quote">> So could you also try anohter trackpad on anthoer HP Falco Chromebook?</span >
I can't do that.
I don't know if that matter but in GalliumOS and ChromeOS (they both use the
ChromeOS driver and I don't know if there is some kind of patch that discards
any movement larger than 20mm like in synaptics) there is no jump too.</pre>
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