On Thursday, 20 of March 2008, Pavel Machek wrote: > On Tue 2008-03-18 21:25:27, Eric W. Biederman wrote: > > Alan Stern <stern at rowland.harvard.edu> writes: > > > > > On Wed, 19 Mar 2008, Rafael J. Wysocki wrote: > > > > > >> Well, I've been saying that for I-don't-remember-how-long: on my box, if you > > >> use S5 instead of entering S4, the fan doesn't work correctly after the > > >> resume. Plain and simple. > > >> > > >> Perhaps there's a problem with our ACPI drivers that causes this to happen, > > >> but I have no idea what that can be at the moment. > > > > > > IMO it would be worthwhile to track this down. It's a clear indication > > > that something is wrong somewhere. > > > > > > Could it be connected with the way the boot kernel hands control over > > > to the image kernel? Presumably ACPI isn't prepared to deal with that > > > sort of thing during a boot from S5. It would have to be fooled into > > > thinking the two kernels were one and the same. > > > > It should be easy to test if it is a hand over problem, by turning off > > the laptop by placing it in S5 (shutdown -h now) and then booting same > > kernel again. > > Feel free to help with testing. > > I believe ACPI is simply getting confused by us overwriting memory > with that from old image. I don't see how you can emulate it with > shutdown. Well, in fact ACPI has something called the NVS memory, which we're supposed to restore during the resume and which we're not doing. The problem may be related to this. I have fixing that on my todo list, but frankly there's many different things in there. :-) Thanks, Rafael
