<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Acer Aspire 5749 - The cursor jumps when scrolling with two fingers" href="https://bugs.freedesktop.org/show_bug.cgi?id=96275#c8">Comment # 8</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Acer Aspire 5749 - The cursor jumps when scrolling with two fingers" href="https://bugs.freedesktop.org/show_bug.cgi?id=96275">bug 96275</a> from <a class="email" href="mailto:benjamin.tissoires@gmail.com" title="Benjamin Tissoires <benjamin.tissoires@gmail.com>"> Benjamin Tissoires</a> <pre>thanks for the dmesg. Here are my analysis: - the touchpad is a synaptics one, using the non image sensor - the touchpad support multi-finger but given the poor tracking, the kernel sets the SEMI_MT flag. - the touchpad has the following caps: SYN_CAP_EXTENDED, SYN_CAP_MULTIFINGER, SYN_CAP_PALMDETECT, SYN_CAP_ADV_GESTURE So: - finger jumps in the slotted touches are normal here, we are using semi-mt protocol - at E: 0.542783, I don't think the ABS_X/Y are jumping, so you should be fine in term of scrolling for this event at least. Peter: when we have semi-mt devices, we can't assume the kernel won't send jumps. So I think libinput should not tell user-space that there is a jump and should simply detect and discard the jumps.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>