Re: [Linuxwacom-discuss] Intuos4 and pointer jitter

[SHIRAKAWA A. <shi...@gm...>]

On 2009-12-22 21:51, Alexia Death wrote:
> Well, nothing to do with the shaking anyway because the linuxwacom
> driver does not touch this data AFAIK.

I think I've seen in the linuxwacom drivers a connection speed setting 
(even if I'm using a USB tablet). I don't know if it can be tweaked or 
not, maybe it can help. But again, other users report no problem...

> Your last mail said that windows virual on linux shared the problem, right?

More like this:
- on native Windows Vista (Nforce 430, AMD Athlon X2) = OK
- on native Windows Vista (Intel G45, Core 2 Duo E8500) = OK
- on native Windows 7 (Intel G45, Core 2 Duo E8500) = OK
- on native Ubuntu 9.XX XXbit (Intel G45, Core 2 Duo E8500) = Jitter!
- on native Ubuntu 9.10 64bit (Nforce 430, AMD Athlon X2) = Jitter!
- on native Ubuntu 9.XX 32bit (Nforce 2, AMD Athlon XP) = Jitter!
- on virtual Ubuntu 9.10 64bit (Intel G45, Core 2 Duo E8500) = Jitter!

I still haven't had the chance to check under virtual Windows under 
Linux, but I suspect the tablet would work correctly if USB data is 
passed raw to the virtualized system.

> Amount shouldn't be the problem but stability may be.

Could be, but in the end (the last part of my previous message) I tried 
on a different PC and the problem was still there.

> If it works, complaints/bugs probably need to land on the USB driver.

Unfortunately I've been unable to force USB speed to 1.1 on my current 
PC. I should try on other ones (even an Intel Atom netbook) tomorrow.

>> I don't know what to think anymore...
>> If it's the tablet, why under Windows it works perfectly it's beyond my
>> comprehension. I also guess it's not an USB driver issue.
> Not under virtual windows in linux tho, right? If it worked there too,
> one might suspect that windows driver is doing some smoothing....

Unfortunately I can't try Virtual Windows in Linux, at least not right 
now. It would take a while to set up.

> I dont know... In electronics, unexplained noise usually starts with a
> bad ground connection somewhere... but here...

I checked that too; the ground connection on every pc in my house is ok. 
My PC actually had a faulty ground until a few months ago, but that was 
before I got my Intuos tablet (and my previous Bamboo Fun tablet worked 
excellently under Ubuntu anyway, no jitter at all).

-- 
SHIRAKAWA Akira