Bug 196127

Summary:	intel_idle.max_cstate=1 required to prevent crashes - Braswell - HP 250 G5 laptop
Product:	Power Management	Reporter:	Volodymyr Saveliev (vov4ik829)
Component:	intel_idle	Assignee:	Len Brown (lenb)
Status:	RESOLVED UNREPRODUCIBLE
Severity:	normal	CC:	yu.c.chen
Priority:	P1
Hardware:	Intel
OS:	Linux
Kernel Version:	4.4.0-79-generic	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	lspci and "cat /proc/cpuinfo" output

Description Volodymyr Saveliev 2017-06-19 22:17:48 UTC

Created attachment 257075 [details]
lspci and "cat /proc/cpuinfo" output

I have issues with my HP 250 G5 laptop, similar with issues described here:

https://bugzilla.kernel.org/show_bug.cgi?id=109051 and here:
https://bugzilla.kernel.org/show_bug.cgi?id=193011

My laptop suffers from random freezes and the only way to cure it seems to add intel_idle.max_cstate=1 to boot parameters.

Comment 1 Len Brown 2017-06-19 23:16:20 UTC

is there a way to make the freezes *LESS* random
and occur *MORE* frequently?

what is the highest number N in "intel_idle.max_cstate=N"
where this system is stable?

Comment 2 Volodymyr Saveliev 2017-06-20 17:09:10 UTC

(In reply to Len Brown from comment #1)
> is there a way to make the freezes *LESS* random
> and occur *MORE* frequently?
> 
> what is the highest number N in "intel_idle.max_cstate=N"
> where this system is stable?

Regrding more frequently. It happens often while watching HTML5 videos. Also it may freeze if notebook is left untouched for long time, even half of an hour.

Regarding highest N, I will check and report.

Comment 3 Volodymyr Saveliev 2017-07-04 11:36:32 UTC

Hello, I updated kernel to version 4.4.0-83-generic, which came with ubuntu updates. I'm using the laptop for several days since, and can confirm that it didn't freeze even without "intel_idle.max_cstate". Suppose it was fixed someway.
Great thanks to everyone, who is engaged.