Ubuntu
linux package

Power state does not drop lower than pc03 for package (Haswell i7-4500U)

Bug #1581236 reported by Greg Lutostanski
14
This bug affects 2 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Expired
Medium
Unassigned

Bug Description

So similarly to bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1579917, I am also not able to get into pc10, as described there.

I am using a sata drive, and after setting min_power to /sys/class/scsi_host/*/link_power_management_policy still does not get me into any states lower than pc03.

Following these links -- without testing the patched kernel (Setting min_power gets me to pc03, but not any further)
https://mjg59.dreamwidth.org/42156.html
https://mjg59.dreamwidth.org/41713.html

Attaching the powertop screencap:
http://pastebin.ubuntu.com/16382692/

Revision history for this message
Brad Figg (brad-figg) wrote : Missing required logs.

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1581236

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete
Revision history for this message
Joseph Salisbury (jsalisbury) wrote :

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.6 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc7-wily/

Changed in linux (Ubuntu):
importance: Undecided → Medium
penalvch (penalvch)
tags: added: needs-apport-collect
Revision history for this message
Dave Chiluk (chiluk) wrote :

@Greg

Our Haswell servers aren't seeing this, but one of my desktops is.

By chance do you happen to have an nvidia card in that machine? I've been meaning to rip it out of my desktop and try again, but I haven't found the time.

Also please run apport-collect and upload the logs to this case.

Thank you,

Revision history for this message
Launchpad Janitor (janitor) wrote :

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]

Changed in linux (Ubuntu):
status: Incomplete → Expired
Revision history for this message
Dave Chiluk (chiluk) wrote :

I was able to remove the nvidia card from my desktop and check again. Removing the nvidia card and enabling the integrated graphics resulted in my machine reaching pc6. So I'll leave this as expired for the time being.

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