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Re: Projector and specific laptop not working together

A quick Google search found that this is a known issue at HP. They have a tech note number c03911990 that has a driver patch for the 8540.  There may be something for your specific model as well.

http://h20565.www2.hp.com/portal/site/hpsc/template.PAGE/public/kb/docDisplay?javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken&javax.portlet.prp_ba847bafb2a2d782fcbb0710b053ce01=wsrp-navigationalState=docId%3Demr_na-c04004313-1%7CdocLocale%3D%7CcalledBy%3D&javax.portlet.tpst=ba847bafb2a2d782fcbb0710b053ce01&ac.admitted=1415220017616.876444892.492883150

There are a couple of other threads with people having the same issue as well, with no definite resolution to the problem.

http://h30434.www3.hp.com/t5/Notebook-Display-and-Video/G6-1201sa-Projector-output-Flickering-when-connected-to/td-p/1352711

http://h30499.www3.hp.com/t5/Notebook-HP-ProBook-ZBook/HP-EliteBook-6930p-Projector-Display-Problem/td-p/1137861#.VFqKnodOUqY