Jeff Lane, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com /daily-live/current/ .
If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report: apport-collect -p linux <replace-with-bug-number> Also, could you please test the latest upstream kernel available (not the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags: kernel-fixed-upstream kernel-fixed-upstream-VERSION-NUMBER where VERSION-NUMBER is the version number of the kernel you tested. For example: kernel-fixed-upstream-v3.13-rc3 This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag: needs-upstream-testing If the mainline kernel does not fix this bug, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-VERSION-NUMBER As well, please remove the tag: needs-upstream-testing Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding. ** Tags added: bios-outdated-a09 ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete ** Summary changed: - [Lucid] Possible race condition involving rtc wakealarm when hibernating a system + [Dell Alienware M15x] Possible race condition involving rtc wakealarm when hibernating a system -- 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/571977 Title: [Dell Alienware M15x] Possible race condition involving rtc wakealarm when hibernating a system Status in “linux” package in Ubuntu: Incomplete Bug description: I'm working on a test script that sets a time in the future in /sys/class/rtc/rtc0/wakealarm and then uses pm-suspend to hibernate a system. I believe I've found a race condition that's causing my tests to fail. First, the steps to recreate: 0: cat /proc/driver/rtc and verify that alarm_IRQ says 'no' 1: echo '+180' > /sys/class/rtc/rtc0/wakealarm 1.5: cat /proc/driver/rtc and verify that alarm_IRQ says 'yes' and the correct alarm time is set 2: sudo pm-suspend 3: wait 3 minutes 4: system wakes itself 5: wait for system to fully wake (disk activity to stop, or at the very least, keyboard and mouse function to resume on desktop) 6: cat /proc/driver/rtc and verify that current time is > alarm time and alarm_IRQ still says 'yes' The test, when putting the system into an S3 state, does not suffer from this issue. It DOES when I'm using S4. I think the reason is that S3 wakes quickly enough that the kernel can register that the alarm fired and reset /proc/driver/rtc accordingly, however, when waking from suspend, the kernel takes far longer to wake, causing it to think that even though the rtc's alarm_IRQ fired the IRQ didn't fire, so the kernel does not reset /proc/driver/rtc. For example, this is the output from (my comments highlighted with ## # watch -n 5 'cat /proc/driver/rtc |head -5' ## First observation, note alarm_date is empty, this is after echoing '0' to /sys/class/rtc/rtc0/wakealarm rtc_time : 20:35:11 rtc_date : 2010-04-29 alrm_time : 20:38:03 alrm_date : ****-**-29 alarm_IRQ : no ## wakealarm set rtc_time : 20:35:16 rtc_date : 2010-04-29 alrm_time : 20:37:11 alrm_date : 2010-04-29 alarm_IRQ : yes ## executing pm-hibernate now rtc_time : 20:35:21 rtc_date : 2010-04-29 alrm_time : 20:37:11 alrm_date : 2010-04-29 alarm_IRQ : yes rtc_time : 20:35:26 rtc_date : 2010-04-29 alrm_time : 20:37:11 alrm_date : 2010-04-29 alarm_IRQ : yes ## System is now asleep. ## IRQ must be firing, because system wakes itself at this point after sleeping for the proscribed number of seconds (180) rtc_time : 20:38:16 rtc_date : 2010-04-29 alrm_time : 20:37:11 alrm_date : 2010-04-30 alarm_IRQ : yes ## first report after system is fully awake. Note that rtc_time is now a full 60 seconds ahead of alarm time. I'm not sure what's actually causing this behaviour, but what it seems as though the kernel isn't actually registering that the IRQ actually fired during a hibernate (or the rtc is broken, but it works fine during S3 tests and I can verify that the IRQ fires and alarm_IRQ resets to 'no' in S3 tests). In any case, a race is created that isn't met in S3 testing due to the nearly instantaneous kernel resumption from that sleep state, where it is created (or at least the race is lost) when resuming from S4 due to the length of time it takes to resume from that state.) because of this, subsequent setting of /sys/class/rtc/rtc0/wakealarm will fail without first clearing it with a '0' and if a piece of software is actually looking to see if the RTC fired it's alarm_IRQ, that software will believe that the IRQ has not been fired due to /driver/proc/rtc incorrectly reporting the event. ProblemType: Bug DistroRelease: Ubuntu 10.04 Package: linux-image-2.6.32-21-generic 2.6.32-21.32 Regression: No Reproducible: Yes ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2 Uname: Linux 2.6.32-21-generic x86_64 NonfreeKernelModules: nvidia AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21. AplayDevices: **** List of PLAYBACK Hardware Devices **** card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: bladernr 2029 F.... pulseaudio CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xf0f20000 irq 22' Mixer name : 'IDT 92HD83C1X5' Components : 'HDA:111d7604,102802a2,00100104' Controls : 16 Simple ctrls : 10 Card1.Amixer.info: Card hw:1 'NVidia'/'HDA NVidia at 0xcdefc000 irq 16' Mixer name : 'Nvidia ID a' Components : 'HDA:10de000a,10de0101,00100100' Controls : 0 Simple ctrls : 0 Card1.Amixer.values: Date: Thu Apr 29 20:55:42 2010 HibernationDevice: RESUME=UUID=f4e6db09-5257-40b2-ba2a-0718fc0b3f0d InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027) MachineType: Alienware M15x ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-21-generic root=UUID=acc23352-13ab-4854-b1d7-a1099a5bf3a5 ro quiet splash ProcEnviron: LANG=en_US.UTF-8 SHELL=/bin/bash RelatedPackageVersions: linux-firmware 1.34 SourcePackage: linux dmi.bios.date: 03/11/2010 dmi.bios.vendor: Alienware dmi.bios.version: A05 dmi.board.vendor: Alienware dmi.board.version: A05 dmi.chassis.type: 8 dmi.chassis.vendor: Alienware dmi.chassis.version: A05 dmi.modalias: dmi:bvnAlienware:bvrA05:bd03/11/2010:svnAlienware:pnM15x:pvrA05:rvnAlienware:rn:rvrA05:cvnAlienware:ct8:cvrA05: dmi.product.name: M15x dmi.product.version: A05 dmi.sys.vendor: Alienware --- Architecture: i386 DistroRelease: Ubuntu 10.04 InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5) Package: linux (not installed) ProcEnviron: LANG=en_US.UTF-8 SHELL=/bin/bash Tags: lucid Uname: Linux 2.6.34-999-generic i686 UnreportableReason: The running kernel is not an Ubuntu kernel UserGroups: To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/571977/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
