Thank you for this info, I've installed the new driver and now stanby works 
well, there are no artefacts of any type, and brightness control works too (but 
I still get the message "Cannot get laptop panel brightness" from gnome 
brightness applet).
Thank you very much for helping me!

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brightness keys don't work on HP 8530w
https://bugs.launchpad.net/bugs/366793
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