<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - Trackpad drags halt suddenly" href="https://bugs.freedesktop.org/show_bug.cgi?id=99975#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - Trackpad drags halt suddenly" href="https://bugs.freedesktop.org/show_bug.cgi?id=99975">bug 99975</a> from <a class="email" href="mailto:peter.hutterer@who-t.net" title="Peter Hutterer <peter.hutterer@who-t.net>"> Peter Hutterer</a> <pre>When you were using the synaptics driver, did you change its options for FingerHigh or FingerLow? here's what happens here, the touchpad is set up for a schmitt trigger with values 30 high and 25 low, i.e. over 30 triggers a touch down, falling below 25 triggers a touch up. In the recording this first happens here E: 5.600873 0003 0035 2390 # EV_ABS / ABS_MT_POSITION_X 2390 E: 5.600873 0003 003a 0024 # EV_ABS / ABS_MT_PRESSURE 24 E: 5.600873 0003 0000 2390 # EV_ABS / ABS_X 2390 E: 5.600873 0003 0018 0024 # EV_ABS / ABS_PRESSURE 24 E: 5.600873 0000 0000 0000 # ------------ SYN_REPORT (0) ---------- +12ms and after that you don't make a pressure of 30 anymore. Device range is 0..3276, so 2390 is 73% of the way in, so that matches your description. The lowest pressure recording of true interaction seems to be 14. the synaptics driver pretty disabled pressure-based touchpads for elantech touchpads so that would explain why you're seeing a change now with libinput, I left it intentionally. I think measuring the real finger pressure would be a useful here, I'll see if I can produce a useful tool for this. You can hack this up for now if you want, in libinput's tp_init_pressure() function set tp->pressure.high and tp->pressure.low to 1. Then you can use the touchpad normally and run evemu-record in the background for a few hours to collect enough data.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>