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With Raspbian Wheezy I could do the following without any problem through a PHP script run by Apache on the local Pi:

exec('env DISPLAY=:0 xdotool mousemove 20 10 2>&1', $output);

But now I have upgraded to the latest Raspbian Jessie it doesn't work anymore. I get the following error in $output:

No protocol specified
Error: Can't open display: (null)
Failed creating new xdo instance

Why is that and how do I fix it?

Note: The X session is running under the pi user and Apache is running under the www-data user.

Note: With Wheezy I used matchbox-window-manager and kweb browser, but now I use LXDE and Chromium that comes with Jessie. I don't think that should matter though, since as far as I recall xdotool also worked with LXDE in Wheezy (don't recall 100% for sure though).

Here is a very similar question but the answer is a work-around that doesn't work for me.

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