So, it sounds like its basically working for you now? For tilt reporting pressure, I suspect this is just way inductive technology works with limitations touchscreens impose. Maybe Ping can confirm.
The only additional tweaks I can think of: 1) Maybe pressure values from hardware should be ignored unless either tip or eraser press is reported by hardware. Does tip/eraser map to a real internal button indicating physical touch? I suspect so since there is a delay in ability to detect pin vs. eraser. To test this idea, edit wcmISDV4.c around line 171 and add "if (!coord.tip && !coord.eraser) ds->pressure = 0;" 2) Maybe hardware is reporting maximum of 127 values for a reason. Even though its returning 0-255 we might need to ignore all pressure values below 128. To test this idea, edit wcmISDV4.c around line 171 and add if (ds->pressure > 128) ds->pressure = 0;" Chris On Thu, Jan 20, 2011 at 4:30 AM, AndrewP <[email protected]> wrote: > Finally I saw maxZ=255 in Xorg.0.log when set maxZ to 255 in git drivers > also xinput shows level 2048 when I press much stronger. But still it > catches > pressure very willingly: > I get values about 800-1000 with light press. > 0-168 when not even touching it. Don't see anything wrong when holding pen > exactly straight up. But when holding in my natural way it's even up to 168. > If I tilt it > even more I get values around 600-800 easily (no touching). > After values of 1600 it feels pretty linear. > Tried several Threshold values as it should be it affect only when "click" > is actually > recognized, thus limiting a pressure range. > On Wed, Jan 19, 2011 at 15:02, Chris Bagwell <[email protected]> wrote: >> >> On Tue, Jan 18, 2011 at 4:18 PM, AndrewP <[email protected]> wrote: >> > How do I tell if some other driver is using the device? >> > I removed tablet device from xorg.conf >> > and I guess inputattch won't keep working if serial port is already >> > used. >> > I get pressure in gimp but it feels way less then even 127 levels. of >> > course >> > it is very >> > subjective but I get around 30-40 levels and I need to press really >> > light to >> > be able >> > to use it. >> > >> >> After you upgraded to latest git, you did not re-patch wcmISDV4.cc to >> force MaxZ to 254. Can you do that and try gimp again? >> >> Please realize that without this change that pressure of 127 to 254 >> will all equal 2048. Also, what did you end up setting your Threshold >> to? Somewhere around 800? >> >> Divide what ever that Threshold value is by 16. Example: 800/16=50. >> So this example means that only pressures of 50-127 are useful for >> drawing. A very small range indeed and very much shifted to light >> pressure side. >> >> If you change MaxZ=254 then it becomes 800/8=100 so 100-254 are valid >> pressure ranges. A much greater range. You'll want to also adjust >> your Threshold value down by 1/2 since Thresholds are different units >> once the MaxZ=127 bug is fixed (the 16 vs 8 I mentioned). So halving >> to Threshold=400 would give you pressure ranges of 50-254. >> >> Chris > > ------------------------------------------------------------------------------ Protect Your Site and Customers from Malware Attacks Learn about various malware tactics and how to avoid them. Understand malware threats, the impact they can have on your business, and how you can protect your company and customers by using code signing. http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ Linuxwacom-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linuxwacom-devel
