Re: [Linuxwacom-discuss] Wacom Intuos3 / Debian Stretch / Tilt values wrong in relative mode

[Hanns H. R. <co...@sc...>]

Hello,

thanks for the answers. But as I said, you cannot do _anything_ useful
with relative/integrated tilt because the values are meaningless, so I
can't imagine any application using those values. Or am I missing some
use case?

Would it be possible to fix this issue?

Best, .h.h.


On 09/01/18 04:34, Peter Hutterer wrote:
> On Mon, Jan 08, 2018 at 12:00:19PM -0800, Jason Gerecke wrote:
>> My apologies for the delay in replying --
>>
>> When the tablet is switched to relative mode, it seems that all axes
>> (not just X and Y) begin emitting relative data. This appears to be
>> intentional, however: commit 49d7635e19 introduced this behavior,
>> noting that "the [axis value] builds up to the maximum and stays
>> there, even when the pen is lifted off the tablet." It links to
>> https://sourceforge.net/p/linuxwacom/bugs/156/ which suggests leaving
>> the pressure/tilt/etc. values absolute and only making the X and Y
>> axes relative. Why this suggestion was not acted on, I'm not sure...
>> Perhaps applications assume(d) that all axes were absolute or
>> relative, and so having a device "partially relative" caused problems?
> 
> I think this was the issue. In the XI 1.x protocol you only have a device
> mode, not a per-axis mode (that's XI2, but well, backwards compatibility
> guarantees we can never use it). So you can't have one axis as relative and
> one as absolute, no way to tell the client that's the case. And the mode is
> device-global (with no event, iirc).
> 
> Cheers,
>    Peter
> 
>> I'm pinging the person who made that change to see if they can
>> remember anything, but its been this way for an awfully long time...
>>
>> Jason
>> ---
>> Now instead of four in the eights place /
>> you’ve got three, ‘Cause you added one  /
>> (That is to say, eight) to the two,     /
>> But you can’t take seven from three,    /
>> So you look at the sixty-fours....
>>
>>
>> On Mon, Jan 8, 2018 at 2:14 AM, Hanns Holger Rutz <co...@sc...> wrote:
>>> ping...
>>>
>>> On 21/11/17 13:40, Hanns Holger Rutz wrote:
>>>> hi,
>>>>
>>>> I don't know if this is the right place to ask (if not, please kindly
>>>> point me to a better forum) -- I'm having problems with a Wacom Intuos3
>>>> on Debian Stretch; whenever I use relative coordinate mode, the tilt
>>>> values are fluctuating more or less randomly and not correctly
>>>> initialised when I approach the tablet with the stylus; it seems there
>>>> is a bug that tries to apply some "relative integration" to the tilt
>>>> values as well, which of course is wrong.
>>>>
>>>> Is this a known issue?
>>>>
>>>> Best, .h.h.
>>>>
>>>
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