Comment 4 for bug 1593124

I installed kernel from proposed today:

$ uname -a
Linux delllap-16 4.4.0-34-generic #53-Ubuntu SMP Wed Jul 27 16:06:39 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

On Dell Precision 5510, I don't see any improvement while using the synaptics client. I especially still have the symptom that the cursor flies to the bottom of the screen in a seemingly random way.

The "disable while typing" feature is the only thing that really helps, but if you use that, then you go crazy because, when you stop typing, you have to stop and wait a second or two in order to use the touchpad again.

I can't find any settings for the Palm features that make a noticeable difference. The synaptics documentation is pretty vague on the numbers and their meaning, but i've tried all kinds of variations like

$ synclient -l | grep Palm
    PalmDetect = 1
    PalmMinWidth = 15
    PalmMinZ = 10

$ synclient -l | grep Palm
    PalmDetect = 1
    PalmMinWidth = 5
    PalmMinZ = 50

It looks like this latter one means any touch wider than a finger counts as a palm, but I still see the cursor thrashing about wildly while I move my lower hand and brush the keyboard.

The most horrible element in this is that, if I'm typing while looking at a book, sometimes the cursor will jump to a new position, a section will get highlighted, and then it is obliterated by the next thing I type.

I will try with libinput, but I don't really want to because I have to give up a lot of features I depend on from day to day. Several tapping and coasting settings have not been implemented there yet.