Messages in this thread | | | From | Bjorn Helgaas <> | Date | Wed, 21 Mar 2012 14:54:05 -0600 | Subject | Re: [PATCH] sky2: override for PCI legacy power management |
| |
On Wed, Mar 21, 2012 at 2:47 PM, Stephen Hemminger <shemminger@vyatta.com> wrote: > On Wed, 21 Mar 2012 14:22:01 -0600 > Bjorn Helgaas <bhelgaas@google.com> wrote: > >> On Wed, Mar 21, 2012 at 9:32 AM, Stephen Hemminger >> <shemminger@vyatta.com> wrote: >> > Some BIOS's don't setup power management correctly (what else is >> > new) and don't allow use of PCI Express power control. Add a special >> > exception module parameter to allow working around this issue. >> > Based on slightly different patch by Knut Petersen. >> > >> > Reported-by: Arkadiusz Miskiewicz <arekm@maven.pl> >> > Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> >> >> Is there a problem report URL you can include here? >> >> It looks like this requires a user to figure out that he might be >> suffering from this problem, then use this module parameter to work >> around it. How would a user figure that out? Can we do it >> automatically to save him the trouble? > > I am not a power management expert. Looks like a BIOS issue where the > BIOS has configured the device to disable power management but the > user wants to override that value. There is no method to determine > when the BIOS is broken versus when the BIOS setting is correct and > we should follow what it says.
I'm not a power management expert either. I was just wondering whether the known broken BIOSes could be encoded in a blacklist or something, because it looks like a case where a user might have to request help or debug the problem again before discovering this flag.
Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |