 X.org Problems, Problems with Xournal after Upgrade to 2.6.26 Kernel |
OESF Forums > Distros, Development, and Model Specific Forums > Distro Support and Discussion > Angstrom & OpenZaurus  |
 Apr 7 2009, 03:12 AM
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#1
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Group: Members Posts: 10 Joined: 31-October 08 Member No.: 23,292  |
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 |
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Apr 7 2009, 03:40 AM
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#2
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Group: Members Posts: 132 Joined: 27-June 05 From: Prague, Czech Republic, Europe Member No.: 7,468 |
This is a problem of the kernel. According to the Cyril Hrubiš's blog 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. |
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Apr 7 2009, 11:35 AM
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#3
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Group: Members Posts: 142 Joined: 4-December 06 From: Lake Constance, Germany Member No.: 13,087 |
QUOTE(utx @ Apr 7 2009, 01:40 PM)  This is a problem of the kernel. According to the Cyril Hrubiš's blog 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 |
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Apr 8 2009, 07:04 AM
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#4
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Group: Members Posts: 10 Joined: 31-October 08 Member No.: 23,292 |
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 |
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May 25 2009, 04:10 AM
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#5
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Group: Members Posts: 10 Joined: 31-October 08 Member No.: 23,292 |
QUOTE(utx @ Apr 7 2009, 01:40 PM) This is a problem of the kernel. According to the Cyril Hrubiš's blog 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 |
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