Hi Jonas,

> sorry for all the noise, I promise this is the last message I'm sending
> for today.

Well, it's very useful noise. You've pretty much figured it out...

> The bug doesn't happen either with the current upstream version of
> xf86-video-intel. i just upgraded to the git version and i don't
> experience it anymore.
>
> i suspect thus, it is actually in xf86-video-intel and got fixed between
> version 2.15.0-1 and current upstream.

If this is confirmed by others, we're probably in good shape!
I suspect it might have to do with

http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=3145530feed879082bcfab11ffc8e7fd0911c920

(This is a commit from 3 days ago, fixing an issue with flushing refresh 
requests. Not intel965-specific, but it is a display refresh issue. 
There's also a couple of April 17 commits that might or might not be 
about processing of batch requests, one of them i965-specific).

But I am really not sure.

Anyway: it seems impractical to try and work around such a specific 
issue in xournal in an unobtrusive way -- xournal is very far removed 
from the intel driver in the processing chain. If the upgrade to the git 
version of the intel driver fixes the issue for everyone, I'd advocate 
contacting the xf86-video-intel maintainer in the relevant distributions 
to report the problem and request an update of the distribution's intel 
driver package to include the latest upstream commits.

Thanks again for all your detective work!
Denis


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