On 12.05.2017 08:56, Martin Kepplinger wrote:
No, you won't have "move after hold>5s" broken. Because at the HID
level, the device is supposed to send an update on every touch when
reporting a touch (for Windows 8 devices). So if there are tiny
movements filtered at the input level in the kernel, we will get those
and I suspect the timeout will only appear when the finger actual
leaves the surface.
ok. sounds a little more like a solution in the kernel would be
justified. Isn't it? It still feels dangerously ugly.
Mainly I wanted to point out that if you somehow have to stay with "no"
for such broken devices, tslib would be a garbage can for userspace
workarounds. (in this case, most probably a new device-specific hidraw
based module).
(...)
Thank you for clarification. So do someone have an idea how it is
possible that Windows manages this? From my point of view, they can't
rely on timeouts because effect is visible immediately after releasing
finger. Is it possible that they use other protocol for communication
with device then we do? Because beside that, I don't see any other
option - there is too few information from device to correctly handle
this situation.
hey, Benjamin explained what most probably is going on, see above, so:
1. convice yourself that microsoft isn't using out-of-band data by
sniffing the connection.
Touchscreen is communicating via i2c - am i right? Can you recommend
some i2c sniffer for windows?
2. if not, and Benjamin is right, come up with a timer- and hidraw based
solution (I guess) and convince him and Dmitry to take it.
3. if they don't see any chance to support such broken behaviour in the
kernel, which could as well be and also has it's benefits in some way,
you write the thing in userspace (a tslib raw module is only one example
that would make it easy for you).
Even *if* Synaptics would come up with a firmware update:
1. the current firmware is already out there in the wild;
2. it takes time and work to get people to update
so, if I had the device, I'd write a workaround.
It is reasonable what you've wrote. The only blocker for me is that I
have almost zero-experience in low level programming. I'm from java
world :-) It is why I was looking for some low entry level solution.
I'll do my best but every helping hand will be appreciated.
Cheers,
Arek
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