If I build SLES11 SP4 x86_64 on HP Gen9 server with UEFI and Secure Boot enabled the mgag200 video driver is used (I believe). If later I disable Secure Boot in hardware RBSU settings, the OS will still boot but no graphical session starts. Secure Boot must be re-enabled in HW for my graphical session to start. Anyone know if this is by design? After installation with Secure Boot enabled, is the only possibility of disabling Secure Boot to reinstall the OS after first disabling Secure Boot in HW? Or...is there some setting in the OS that can be changed prior to changing the HW setting that allows moving the same installation between Secure Boot off and on?
Likewise, if SLES11 SP4 is installed with Secure Boot off, is there a way to turn Secure Boot on, or must I reinstall?
I suppose it wouldn't be very Secure if it could be turned off, but I can't find anything in writing regarding this and my organization wants to know the rules: When a change can be made, when a system must be reinstalled if that change is desired, etc.