Rafael J. Wysocki wrote: > On Sunday, 21 of September 2008, Maxim Levitsky wrote: >> Maxim Levitsky wrote: >>> Rafael J. Wysocki wrote: >>>> On Saturday, 20 of September 2008, Maxim Levitsky wrote: >>>>> Hi, >>>>> >>>>> I hit a dead end when trying to understand why my notebook can't >>>>> resume from suspend to ram >>>>> if this is done two times a row. >>>>> >>>>> Single suspend/resume cycle works almost perfectly (beep that goes >>>>> through the sound card is muted... no morse code for me... :-( >>>>> >>>>> ) >>>>> >>>>> I compiled a minimal kernel (absolutely nothing but disk drivers, all >>>>> experimental option like nohz >>>>> turned off) >>>>> >>>>> But I had to turn SMP, since without it system won't resume first >>>>> time I suspend it. >>>>> (How could this affect suspend?) >>>> It could if the system is 64-bit. In which case please have a look at >>>> http://bugzilla.kernel.org/show_bug.cgi?id=11237 >>>> >>>>> With SMP and minimal kernel (of course no closed drivers), I get >>>>> same behavior, >>>>> first resume works second hangs. >>>>> >>>>> I then added some debug code to real mode wakeup code, I put there in >>>>> first >>>>> place instructions, that will save some magic value to rtc (to alarm >>>>> registers that I know are preserved during boot cycle), and I >>>>> discovered sad thing that first time bios does pass control to >>>>> linux, but second time >>>>> (when it hangs), it doesn't. >>>>> >>>>> I tried to update bios, and I got same results. >>>>> >>>>> Of course it does work with that @#$%^& OS >>>> So we're doing something wrong. Please try the appended patch. >>> Thanks a lot, but this didn't help. >>> >>> It still has same pattern, first suspend/resume works perfectly, second >>> suspend/resume hangs hard. >>> It always happens like this, first resume always work (unless I turn off >>> smp in kernel (I test this again), or reserve all low memory) >>> >>> Also note that if I suspend the system to ram, resume, and then suspend >>> to disk, then I can suspend to ram and resume, it seems that >>> >>> on suspend to ram cycle somehow arms BIOS or something else, so second >>> resume in a row doesn't work. >>> >>> I run 32 bit kernel here, this is a long story (this bios doesn't turn >>> fan on when running 64-bit version, I could update it, and I know that >>> fan issue is fixed there, but new bios introduces bigger bug, namely it >>> makes fan to run almost always regardless of 32/64 type of os. >>> And it doesn't fix this suspend/resume issue, I tested this. I could >>> start/stop fan manually with a script, but this could fail, and maybe I >>> will do so someday.) >>> >>> The bugzilla seems to be unrelated here, since bios does pass control >>> there, but corrupts memory. >>> Here I also have seen that bios corrupts memory, but everything resumes >>> fine first time, and on second time, >>> bios doesn't pass control (I put set of instructions in beginning of >>> wakeup real mode assembly file, no page tables, GDT/LDT are used there) >> I did same test for kernel without SMP, yes it hangs on first resume, but bios >> does pass control to linux, so while this is a minor bug, it is unrelated. > > Still, I'd be interested in debugging this one too, if possible. That may be > easier too. ;-) I take a look at that. > >> I also tested noapic, pci=nommconf. No luck. >> >> Pattern is always the same, first resume works always, second doesn't. >> It is sad since first resume is almost perfect (when I have free time I need to look at sound codec datasheet >> and fix few issues there, anyways here alsa has few issues, all this is trivial, I already fixed all issues with desktop >> which has a sigmatel codec) > > If you have more than 2 GB of RAM, you can try iommu=soft . > > I guess that all of the /sys/power/pm_test tests are passed? Well, I didn't run /sys/power/pm_test. But this system has rock solid suspend to disk, I use it always. iommu? I don't think this mobo has it, it has PM965/GM965/GL960 (according to lspci) Best regards, Maxim Levitsky > > Thanks, > Rafael _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
