OESF Portables Forum

Everything Else => Zaurus Distro Support and Discussion => Distros, Development, and Model Specific Forums => Archived Forums => Angstrom & OpenZaurus => Topic started by: olipage on April 07, 2009, 07:12:59 am

Title: X.org Problems
Post by: olipage on April 07, 2009, 07:12:59 am

Hi,

I am using latest angstroem kernel 2.6.26 on my zaurus. After the upgrade to this kernel everything works as supposed, even better poverall performance. i was experimenting with window manager xfce, but didn't work out. now that i return to matchbox, actually setting everything back to matchbox i have a strange behaviour in xournal.

When trying to "write" or set marks to whatever the touchscreen seems to be really really sensible as it is almost unpossible to make a more or less good line. i have marks looking like a heartbeat in fact when trying to make a straight line?

does anyone have any idea where to begin searching for this thing? i liked xournal, but now its almost unusable as i can't write anything. when trying to write the marks get absolutely unreadable. besides of this all the otherthings are working fine...

kind regards,

Oliver Zieger

Title: X.org Problems
Post by: utx on April 07, 2009, 07:40:50 am

This is a problem of the kernel. According to the Cyril Hrubiš's blog (http://watashi-metan.livejournal.com/2955.html) and private talk, touch screen code in the kernel needs rewrite: Current implementation is polling based, but it should be interrupt based. To eliminate noise, reading of touchscreen should be synchronized with the LCD panel refresh.

As an ugly work-around you can use tslib filtering.

Note: Collie have had the same problem in past.

Title: X.org Problems
Post by: ofels on April 07, 2009, 03:35:40 pm

Quote from: utx

This is a problem of the kernel. According to the Cyril Hrubiš's blog (http://watashi-metan.livejournal.com/2955.html) and private talk, touch screen code in the kernel needs rewrite: Current implementation is polling based, but it should be interrupt based. To eliminate noise, reading of touchscreen should be synchronized with the LCD panel refresh.

As an ugly work-around you can use tslib filtering.

Note: Collie have had the same problem in past.

Needless to say that the same is occuring under zubuntu...

Oliver

Title: X.org Problems
Post by: olipage on April 08, 2009, 11:04:32 am

hey guys,

thanks a lot for this. so thats the reason for this. hm, it used to work fine with 2.6.23, so i thought this wouldn't really be something of the kernel, but ok.

kind regards,

Oliver

Title: X.org Problems
Post by: olipage on May 25, 2009, 08:10:45 am

Quote from: utx

This is a problem of the kernel. According to the Cyril Hrubiš's blog (http://watashi-metan.livejournal.com/2955.html) and private talk, touch screen code in the kernel needs rewrite: Current implementation is polling based, but it should be interrupt based. To eliminate noise, reading of touchscreen should be synchronized with the LCD panel refresh.

As an ugly work-around you can use tslib filtering.

Note: Collie have had the same problem in past.

well, i somehow got tslib to work, and using ts_test i get a really good result using the touchscreen. unfortunately, when using xournal, the result is still unusable. it seems, ts_test DOES use the device through the filtering using the env-vars, but the xournal for example not. is there a way to have the flitering used by all programs? unfortunatly i can't even say whether it is using filtering other then in ts_test. is there somewhere to look it up? setup and daemon seems to get started, following init.d (there is a start script, using the ts.conf) - if i have an invalid ts.conf screen does not work at all. so it seems to get loaded at least.

thanks for any advice...

Oliver