Dear reader,
I have a Probook 6550B with windows7, Intel HD Graphics.
It switches irregularly to 'duplicate screen' mode when there is no external monitor connected. In fact, when i do attach an external monitor and set the intel HD graphics to 'internal screen' - it keeps that setting and the external monitor stays black... but as soon as i disconnect it, the laptop resets to 'duplicate screen mode' again (or whatever the English version of Windows7/the Intel driver calls it... with cloned screens.)
When i manualy select 'internal display', after a while the laptops bleeps - and switches to 'cloned screen with external monitor' again..(Fn-F4 or via the fastmenu on the right, no screen cloning or wide desktop; 1 internal monitor only.
i do receive an error message: that the screen resolution is not optimal for the external monitor...
I have not found any reason (software, heat, overload) for the laptop to spontaniously switch it's graphics settings. It happens while playing a game, but also when nothing (except for the OS) is running.
When i only connect a VGA cable, without monitor, the laptop still tries to switch to cloned screen...
The laptop has been send to HP - but it never got repaired... so the desparate owner (who switched to Mac, by the way) asked me to fix it ;-)
Boy, am i lucky...
I tried to disable the external VGA in the BIOS - no succes
I did update, replaced, reinstalled the driver Intel HD driver - no succes
I even reinstalled Windows7 - you guessed it. Even with a totaly clean install (reset), the problem occurs.
Since i haven't found anyone with the same problem, i guess it's a hardware error...
Anyone?
thnxs!
jorgen