[Bug 109051] intel_idle.max_cstate=1 required on baytrail to prevent crashes

[Robert Small]

Sending from my phone outside school gates so I'm not able to get all the
details. However, previously on 4.5.7 where I don't need the cstates
parameter at all I've found it to be significantly cooler and by manually
checking and trying to remember it seemed to be lower power usage
(powertop).

Incidentally, those commandline parameters were what was needed to drop the
cstates parameter from the commandline with 4.5.7. Not sure how many are
needed now.

Another possibility is that some of these crashes are software not kernel.
I went from stable to testing yesterday and everything kept crashing. I
upgraded to unstable which has proven to be stable to the same level as
stable. Also, I noticed one crash which recovered itself.

Thanks,
Robert.

On Wed, 21 Sep 2016, 8:40 a.m. Nicolas Huillard, <nicolas at huillard.net>
wrote:

> Le mardi 20 septembre 2016 à 20:19 +0100, Robert Small a écrit :
> > Not only can I confirm that this works it makes sound stable on 4.7.3.10!
>
> Great info, thank you Robert !
>
> > cpu0 State  Name     Disabled  Latency  Residency       Time   Usage
> >          0  POLL            0        0          0     139827     655
> >          1  C1-BYT          0        1          1  278968871  443703
> >          2  C6N-BYT         1      300        275     529818     620
> >          3  C6S-BYT         1      500        560    1498249    1034
> >          4  C7-BYT          0     1200       4000   42598904   11160
> >          5  C7S-BYT         0    10000      20000    5278866     421
> ...
>
> I suppose you can confirm that C6* time and usage doesn't change after
> starting the script. C7* are not used that much, but that's probably
> because you got this snapshot shortly after boot/tests.
>
> > cat /proc/cmdline
> > BOOT_IMAGE=/boot/vmlinuz-4.7.3.10 root=/dev/mapper/vgDrudwyn-root64 ro
> > i915.modeset=1 threadirqs intel_iommu=igfx_off clocksource=tsc
> tsc=reliable
> > sdhci.debug_quirks=0x10000 quiet splash
>
> Wow... That's a lot of parameters... I'll check mine when I can.
>
> What about battery life or device temperature when you leave it alone
> (it's a bit warm when I leave it alone without C7*) ?
>
> --
> NH
>
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