Hi.
04.12.2017 11:35, Pali Rohár wrote:
On Friday 24 November 2017 13:28:59 Oleksandr Natalenko wrote:
On pátek 24. listopadu 2017 12:25:43 CET Pali Rohár wrote:
> On Friday 24 November 2017 12:17:30 Oleksandr Natalenko wrote:
> > > There are two patches waiting to be tested in
> > > https://bugzilla.kernel.org/show_bug.cgi?id=195751
> >
> > Tested and attached a couple of patches on top of those to the BZ. If
> > disabling fan control is the only approach here, I can confirm that this
> > works.
>
> Hi! Please figure out which SMM call (they are identified by eax and ebx
> registers) cause this freeze. So we would now what needs to be
> blacklisted.
Here it goes:
[ 7.191081] dell_smm_hwmon: smm(0x10a3 0x0000) = 0x002e (took 1837
usecs)
[ 7.194007] dell_smm_hwmon: smm(0x00a3 0x0001) = 0xffff (took 151
usecs)
[ 7.198239] dell_smm_hwmon: smm(0x00a3 0x0000) = 0x0002 (took 1411
usecs)
[ 7.199095] dell_smm_hwmon: smm(0x02a3 0x0001) = 0xffff (took 71
usecs)
[ 7.700493] dell_smm_hwmon: smm(0x02a3 0x0000) = 0x157c (took 488912
usecs)
[ 7.701277] dell_smm_hwmon: smm(0x0025 0X0000) = 0xffff (took 71
usecs)
0x02a3 is I8K_SMM_GET_SPEED.
Ok, so it is really a good idea to disable fan control completely on
your machine.
This still doesn't explain why things work in non-Linux environment… But
as a workaround, okay, let it be.
Your last patch in bugzilla looks ok, you add my Reviewed-by: Pali
Rohár <pali.rohar@xxxxxxxxx>
Could you please advice on how to proceed further? I can submit all 3
patches (incl. yours two), to a ML.
Thanks.
Oleksandr
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