I can confirm that a Lenovo T400 experiencing this problem with "Graphic mode=Switchable" was resolved with "Graphic mode=Discrete". Note that I also needed to set "OS Detection for Switchable Graphics=Disabled"
I can confirm that a Lenovo T400 experiencing this problem with "Graphic mode=Switchable" was resolved with "Graphic mode=Discrete".
Note that I also needed to set "OS Detection for Switchable Graphics=Disabled"