** Description changed: - System works fine until Speedstep throttles down the system. + Ubuntu 9.04-system on Dell XPSM1330 works fine until Speedstep is + enabled and throttles down the system. - System doing a hard reboot happening after 1-3 Minutes: - Logfile says: "Clocksource tsc unstable (delta = -192002274 ns)" + If speedstep is enabled, system is doing a "hard reboot". (Suddenly + screen is black and system restarts) This happening after 1-3 Minutes + after the system is started up, usually after "speedstep" has throttled + the CPUs down to 800MHz. - - running burnBX on both cores parallelly: system runs fine (due to avoiding throttleing down) + LAst entry in logfile prior to "sudden reboot": + "Clocksource tsc unstable (delta = -192002274 ns)" + + Workarounds: + - running burnBX on both cores parallelly to keep them busy at 100%: system runs fine (due to avoiding throttleing down) - CPU-Policy set to "Performance": system runs fine (due to avoiding throttleing down) - Disable Speedstep in BIOS: system runs fine + Some details I foud relevant: + $sudo cat /sys/devices/system/clocksource/clocksource0/available_clocksource - hpet acpi_pm jiffies tsc + hpet acpi_pm jiffies tsc $sudo cat /sys/devices/system/clocksource/clocksource0/current_clocksource hpet + Note: I have tried all other clocksources without any noticable improvement: - acpi_pm jiffies tsc + acpi_pm jiffies tsc I also tried the following Ubuntu LiveCDs Ubuntu 8.04.3 Ubuntu 9.04 Ubuntu 9.10-alpha-6 Ubuntu 9.10-beta - Same result, system unstable with Speedstep enabled. + memtest86+ does not report any errors. + + My conclusion on rootcause: + System unstable with Speedstep enabled. ProblemType: Bug Architecture: i386 DistroRelease: Ubuntu 9.04 HibernationDevice: RESUME=UUID=2ac6d3c4-5a63-4caa-885f-1ade094f2517 MachineType: Dell Inc. XPS M1330 NonfreeKernelModules: nvidia Package: linux-image-2.6.28-16-generic 2.6.28-16.55 ProcCmdLine: root=UUID=2b5d1383-c3fd-471f-b452-32cb3040ce2f ro quiet splash ProcEnviron: PATH=(custom, user) LANG=de_DE.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 2.6.28-16.55-generic SourcePackage: linux
-- Clocksource tsc unstable when "Speedstep" is activated https://bugs.launchpad.net/bugs/461406 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
