Wow, I do not know where i got line 171 from. Its around line 721
that it needs to be done. To give you some context, it would be added
after this to reset pressure values:
/* pressure */
ds->pressure = coord.pressure;
BTW, Nicolas posted agreeing with Ping that tilt issue sounds very
much like a stylus problem.
Can you confirm one more time that you do not see similar behavior
under Windows with same stylus? I think I recall you saying behavior
is different. Is it different after you made MaxZ=255 change?
Chris
On Fri, Jan 21, 2011 at 12:16 AM, AndrewP <[email protected]> wrote:
> Are you sure it should go there? I couldn't compile with this correction.
> http://dpaste.org/dF7J/
> On Thu, Jan 20, 2011 at 14:21, Chris Bagwell <[email protected]> wrote:
>>
>> 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
>> >
>> >
>
>
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