Lion and external display

Hi,
When I wake up my MacBoo Pro usingto work with external display, my laptop gets very hot and I with Snow Leo I was used to open the lid to cool it down.
It worked fine, because the laptop screen was black but with Lion I cannot do it because after opening the laptop lid I am getting immediately cloned desktop on my laptop.
Is it possible to come back to the previous behaviour or somehow to switch-off the laptop screen after opening the lid, still with keeping the external display as active and main one?

Hi tgr2007
According to Apple support, it is "expected behaviour" under Lion for the MBP's internal display to reactivate upon opening the lid. A new version of the clamshell mode-related knowledgebase article (replacing HT3131) is due shortly confirming this.
This is despite:
- the obvious temperature-related benefits that were previously achievable (under Snow Leopard) by opening your MBP lid whilst continuing to output solely to a 27" cinema display
- the complete and total waste of energy and graphics processing power in running two active screens if running your MBP in clamshell mode would otherwise make it too hot and/or noisy
- the negative longer-term impact on the battery and other components from running the MBP at any hotter a temperature than it needs to be.   
If you would like to have the previous behaviour restored, please join us (ie the many customers who are being adversely affected by this change) in lobbying Apple to change how Lion handles clamshell mode.
Options available to Apple include changing Lion's expected behaviour or adding a user-selectable option within System Preferences.
Please submit your feedback here:
http://www.apple.com/feedback/macosx.html

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