Exceuted the tracing steps suggested in https://wiki.ubuntu.com/DebuggingKernelSuspend using the latest mainline kernel
# uname -r 3.19.0-031900-generic and everything worked as expected. The suspend state was entered seconds after running # sync && echo 1 > /sys/power/pm_trace && pm-suspend and the notebook resumed within seconds after pushing the power button. As usual the display returned fully dimmed and all controls to alter display brightness have no effect any more. /proc/acpi/wakeup has not changed between suspend and resume. The RTC is skewed by nearly 21 years # hwclock --show Thu 19 Apr 1984 06:00:15 PM CEST -0.485252 seconds indicating that some tracing information were put there. However, I can find only find one pair of [ 1.981094] Magic number: 3:558:892 [ 1.981174] bdi default: hash matches which was already included in dmesg before suspend, and doesn't quite match the pattern of what to watch out for. I am attaching dmesg output both gathered before and after suspend/resume. ** Attachment added: "resume-trace.tar.gz" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1390764/+attachment/4324814/+files/resume-trace.tar.gz ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- 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/1390764 Title: Display remains fully dimmed after resume from suspend Status in linux package in Ubuntu: Confirmed Bug description: After resuming from suspend the display returns fully dimmed, and display brightness can't be adjusted, neither using FN keys, nor using KDE power management control. The issue occurs regardless whether the suspend state was activated by low battery, by closing the display, or by explicitly selecting sleep mode in KDE. Killing and restarting X does not solve the problem. A reboot does. --- ApportVersion: 2.14.1-0ubuntu3.5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: michael 2554 F.... pulseaudio michael 2784 F.... pulseaudio CRDA: Error: [Errno 2] No such file or directory DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=UUID=8dc81a6f-65e9-443d-b850-0f62a1ca52c4 InstallationDate: Installed on 2012-05-13 (909 days ago) InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120424) MachineType: Hewlett-Packard HP EliteBook 8530w Package: linux (not installed) PccardctlStatus: Socket 0: 3.3V 16-bit PC Card Subdevice 0 (function 0) bound to driver "pata_pcmcia" ProcEnviron: LANGUAGE=en_US:en TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 nouveaufb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-39-generic root=/dev/mapper/vg00-lv_root ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-3.13.0-39-generic N/A linux-backports-modules-3.13.0-39-generic N/A linux-firmware 1.127.7 Tags: trusty Uname: Linux 3.13.0-39-generic x86_64 UpgradeStatus: Upgraded to trusty on 2014-05-10 (181 days ago) UserGroups: _MarkForUpload: True dmi.bios.date: 06/24/2009 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: 68PDV Ver. F.0C dmi.board.name: 30E7 dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 90.23 dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvr68PDVVer.F.0C:bd06/24/2009:svnHewlett-Packard:pnHPEliteBook8530w:pvrF.0C:rvnHewlett-Packard:rn30E7:rvrKBCVersion90.23:cvnHewlett-Packard:ct10:cvr: dmi.product.name: HP EliteBook 8530w dmi.product.version: F.0C dmi.sys.vendor: Hewlett-Packard To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1390764/+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
