@penalvch : I got the same profesionnal DELL laptop and the same issue with Precise. On AC or battery, cur_freq is sticked to 800000. I tried to remove cpufreq tools, but nothing changed.
The strange part is when I plug my laptop on my Dell dock at the office, power strategies are working absolutely well ... As soon as it runs undocked, cpu is working at its lowest speed step even when i've not suspended the system once. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1260112 Title: [Dell Latitude E6540] CPU stuck on minimum frequency after resume from suspend and unplugged Status in “linux” package in Ubuntu: Incomplete Bug description: This happens on a Dell Latitude E6540 (4th gen core i7 CPU). Steps to reproduce: 1) normally boot the computer and make sure everything works as expected (i use the ondemand governor) 2) suspend 3) make the computer is unplugged and resume Expected behavior: cpu should work normally Actual behavior: cpu always stays at minimum frequency (in my case 800 MHz) If i resume from suspend while plugged to the AC charger, everything works as expected. --- ApportVersion: 2.12.5-0ubuntu2.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: gjm 2337 F.... pulseaudio /dev/snd/controlC0: gjm 2337 F.... pulseaudio DistroRelease: Ubuntu 13.10 HibernationDevice: RESUME=UUID=98df70b7-f534-4ef6-8647-8e98200ccd64 InstallationDate: Installed on 2013-12-06 (4 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MachineType: Dell Inc. Latitude E6540 MarkForUpload: True Package: linux (not installed) ProcFB: 0 inteldrmfb 1 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic.efi.signed root=UUID=22510d0e-a296-4b0f-a97a-27cb89a65419 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10 RelatedPackageVersions: linux-restricted-modules-3.11.0-15-generic N/A linux-backports-modules-3.11.0-15-generic N/A linux-firmware 1.116 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no Tags: saucy Uname: Linux 3.11.0-15-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo dmi.bios.date: 09/03/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A05 dmi.board.name: 0725FP dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA05:bd09/03/2013:svnDellInc.:pnLatitudeE6540:pvr01:rvnDellInc.:rn0725FP:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E6540 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1260112/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp