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

[Nicolas Huillard]

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