have a similar problem (see bug #881396 which is marked as a duplicate of this) with an HP Probook 4540s with Intel graphics (it has dual radeon intel but I have the radeon turned off in the BIOS settings).
have a similar problem (see bug #881396 which is marked as a duplicate of this) with an HP Probook 4540s with Intel graphics (it has dual radeon intel but I have the radeon turned off in the BIOS settings).