Mbp 15 external display via mini display to hdmi flicker

wondering why my mbp 15 to samsung 22" led monitor via minidisplay to hdmi give me flickers, whereas if i connected to my samsung 37" lcd tv no flicker at all. right now i had to connect to my monitor using minidisplay to vga to avoid the flicker.

While we all have MacBooks in this forum most of us don’t run Lion. There's a Lion Support Community where everybody has Lion. You should also post this question there to increase your chances of getting an answer. Lion seems to have problems with external monitors.  https://discussions.apple.com/community/mac_os/mac_os_x_v10.7_lion

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