https://bugzilla.novell.com/show_bug.cgi?id=516797 https://bugzilla.novell.com/show_bug.cgi?id=516797#c13 Rafael Wysocki changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEEDINFO |ASSIGNED InfoProvider|rjw@novell.com | --- Comment #13 from Rafael Wysocki 2011-03-25 00:54:33 UTC --- Well, there are two types of _OSC bits, support bits and control bits. The support bits, if set, mean that the kernel supports specific features (eg. MSI, PCIe ASPM etc.), while the control bits, if set, mean that the kernel wants to control specific features. The support bits we pass to the BIOS depend on the kernel configuration and are subject to quirks (eg. if the machine is quirked not to use MSI, we won't pass the MSI support bit to the BIOS). Generally, the BIOS does whatever it wants with those bits and that's beyond our control. The mask of control bits we pass to the kernel depends on the support bits plus some configuration switches. For those bits the rule is that if _OSC evaluation fails, pretty much whatever the reason, we won't use features the control of which has not been granted. IOW, we only use the _OSC features (for PCI that basically means PCI Express native hotplug, PME and AER, plus SHPC on some systems, very rare) the control of which has been explicitly granted by the BIOS. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.