Bug 837316

Summary:	Power consumption on laptops with i915 hw
Product:	Red Hat Enterprise Linux 6	Reporter:	Stanislav Graf <sgraf>
Component:	kernel	Assignee:	Lenny Szubowicz <lszubowi>
Status:	CLOSED INSUFFICIENT_DATA	QA Contact:	Red Hat Kernel QE team <kernel-qe>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	6.3	CC:	jshortt, just4nick, mbaudier, mstowe, ppecka, tjackson, twillber
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-10-08 18:17:44 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1269638

Description Stanislav Graf 2012-07-03 12:47:55 UTC

Description of problem:
I need to manually set kernel cmdline paramaters 'pcie_aspm=force i915.i915_enable_rc6=1' to decrease heating of my laptop from 55 to 45 °C. Also increase battery time.

Tested on 2 laptops:

ThinkPad T420s
--------------
# lspci -s 00:02.0 -v
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
	Subsystem: Lenovo Device 21d2
	Flags: bus master, fast devsel, latency 0, IRQ 31
	Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
	Memory at e0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at 4000 [size=64]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 2
	Capabilities: [a4] PCI Advanced Features
	Kernel driver in use: i915
	Kernel modules: i915
# uname -a
Linux localhost.localdomain 2.6.32-280.el6.x86_64 #1 SMP Mon Jun 18 17:28:46 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux

HP Mini 5103 (WT211ES#ARL)
--------------------------
# lspci -s 00:02.0 -v
00:02.0 VGA compatible controller: Intel Corporation N10 Family Integrated Graphics Controller (rev 02) (prog-if 00 [VGA controller])
	Subsystem: Hewlett-Packard Company Device 1608
	Flags: bus master, fast devsel, latency 0, IRQ 26
	Memory at 90480000 (32-bit, non-prefetchable) [size=512K]
	I/O ports at 30a0 [size=8]
	Memory at 80000000 (32-bit, prefetchable) [size=256M]
	Memory at 90300000 (32-bit, non-prefetchable) [size=1M]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 2
	Kernel driver in use: i915
	Kernel modules: i915
# uname -a
Linux localhost.localdomain 2.6.32-220.17.1.el6.x86_64 #1 SMP Tue May 15 17:16:46 CDT 2012 x86_64 x86_64 x86_64 GNU/Linux

Version-Release number of selected component (if applicable):
kernel-2.6.32-220.17.1.el6.x86_64
kernel-2.6.32-280.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Try default RHEL installation on laptop that can use i915 kernel driver
2. Check CPU temperature and battery time.
3. Add at boot 'pcie_aspm=force i915.i915_enable_rc6=1'
4. Check CPU temperature and battery time.
  
Actual results:
Default RHEL cpu temperature is 10 degrees higher. Battery time is shorter.

Expected results:
Default RHEL cpu temperature is NOT 10 degrees higher. Battery time is NOT shorter.

Additional info:

Comment 1 John Poelstra 2012-07-03 18:37:37 UTC

I can confirm that battery life is horrible on the Lenovo x220 with RHEL 6.3, 3 to 4 hours.  With Fedora 17 it's close to 10.  

I tried the kernel args:
pcie_aspm=force i915.i915_enable_rc6=1 i915.lvds_downclock=1 i915.i915_enable_fbc=1 

as described in this article: http://www.williambrownstreet.net/blog/?p=387 

and saw significant improvement--in line with Fedora.  Bonus points too because the bottom of the unit is much cooler and the fan barely runs, making it less noisy.

Comment 2 Toni Willberg 2012-07-04 08:02:40 UTC

I had 62'C temperature after installing RHEL6.3 workstation on my X220, and after applying the kernel args from comment #1 the temperature dropped to 49'C.

Comment 3 Matthew Garrett 2012-07-08 21:39:02 UTC

I'm pretty reluctant to change the ASPM policy in 6, given the potential for breaking hardware.

Comment 4 John Poelstra 2012-07-09 16:54:14 UTC

making bug public--if it shouldn't be, feel free to change back.

Comment 5 Stanislav Graf 2012-09-18 08:40:41 UTC

(In reply to comment #3)
> I'm pretty reluctant to change the ASPM policy in 6, given the potential for
> breaking hardware.

And what about 'i915.i915_enable_rc6=1' - is that possible?
If it is not, can we add this into 'tuned' package?

Comment 6 Red Hat Bugzilla 2023-09-14 01:30:20 UTC

The needinfo request[s] on this closed bug have been removed as they have been unresolved for 1000 days