[Bug 616578] Re: Can't get to low C-states using 2.6.35 karmic backport

[Geoffrey Hausheer]

apport information

** Tags added: apport-collected

** Description changed:

  Using 2.6.35-14-generic maverick backport kernel on Lucid (10.04 UNR), my Atom N450 based netbook can only get into C2 (in the default 2.6.32 kernel the netbook will go into C3).  This results in significantly reduced battery life (~1hour as far as I can tell).  The 2.6.35-14 comes with the new intel_idle module, but as built it can't be installed because it loads after acpi.  Recompiling the kernel with intel_idle compiled into the kernel (not as a module), allows the laptop to go into C4, and power is comparable to 2.6.32.  I'm not sure this is a good idea as the capability is marked experimental, but without this change, my system power is significantly higher with 2.6.35 than with 2.6.32.
  I haven't looked at the Maverick kernel options yet, but It would be unfortunate if netbook power was significantly worse on 10.10 than 10.04
+ --- 
+ AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
+ AplayDevices:
+  **** List of PLAYBACK Hardware Devices ****
+  card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog]
+    Subdevices: 1/1
+    Subdevice #0: subdevice #0
+ Architecture: i386
+ ArecordDevices:
+  **** List of CAPTURE Hardware Devices ****
+  card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog]
+    Subdevices: 1/1
+    Subdevice #0: subdevice #0
+ AudioDevicesInUse:
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  ghaushe    1179 F.... pulseaudio
+ CRDA: Error: [Errno 2] No such file or directory
+ Card0.Amixer.info:
+  Card hw:0 'Intel'/'HDA Intel at 0x58200000 irq 45'
+    Mixer name	: 'Realtek ALC272X'
+    Components	: 'HDA:10ec0272,10250349,00100001'
+    Controls      : 14
+    Simple ctrls  : 8
+ DistroRelease: Ubuntu 10.04
+ HibernationDevice: RESUME=UUID=c96e2cc4-230c-4f7d-a059-e7c999ce046e
+ InstallationMedia: Ubuntu-Netbook 10.04 "Lucid Lynx" - Release i386 (20100429.4)
+ MachineType: Acer AO532h
+ Package: linux (not installed)
+ ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-14-generic root=UUID=646cfd4d-aa47-46e3-b651-5853d90b2c22 ro crashkernel=384M-2G:64M,2G-:128M quiet splash
+ ProcEnviron:
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
+ ProcVersionSignature: Ubuntu 2.6.35-14.20~lucid2-generic 2.6.35
+ Regression: Yes
+ RelatedPackageVersions: linux-firmware 1.34.1
+ Reproducible: Yes
+ RfKill:
+  0: phy0: Wireless LAN
+  	Soft blocked: no
+  	Hard blocked: no
+ Tags:  ubuntu-une lucid kconfig regression-potential needs-upstream-testing
+ Uname: Linux 2.6.35-14-generic i686
+ UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
+ dmi.bios.date: 11/12/2009
+ dmi.bios.vendor: Acer
+ dmi.bios.version: V1.05
+ dmi.board.asset.tag: Base Board Asset Tag
+ dmi.board.name: AO532h
+ dmi.board.vendor: Acer
+ dmi.board.version: V1.05
+ dmi.chassis.type: 10
+ dmi.chassis.vendor: Acer
+ dmi.chassis.version: V1.05
+ dmi.modalias: dmi:bvnAcer:bvrV1.05:bd11/12/2009:svnAcer:pnAO532h:pvrV1.05:rvnAcer:rnAO532h:rvrV1.05:cvnAcer:ct10:cvrV1.05:
+ dmi.product.name: AO532h
+ dmi.product.version: V1.05
+ dmi.sys.vendor: Acer

** Attachment added: "AlsaDevices.txt"
   https://bugs.edge.launchpad.net/bugs/616578/+attachment/1486030/+files/AlsaDevices.txt

-- 
Can't get to low C-states using 2.6.35 karmic backport
https://bugs.launchpad.net/bugs/616578
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