Am Thu, 2 Jun 2016 10:26:22 -0700 Kevin Oberman <rkober...@gmail.com> schrieb:
> On Thu, Jun 2, 2016 at 7:41 AM, Hans Petter Selasky <h...@selasky.org> wrote: > > > On 06/02/16 03:07, RayCherng Yu wrote: > > > >> I got a suddenly poweroff in r300097 (and previous revision in April and > >> May) when I built textproc/docproj. > >> My machine is Macbook Pro 13 2011 early. I have checked the Apple website. > >> My bios is the latest version. > >> Actually it also happened in 10.3-STABLE. > >> It happened when the machine load was heavy. Before it shutdown, the fan > >> started to run very loudly. After several seconds (20 or 30 seconds), my > >> laptop shutdown (poweroff directly) suddenly. It seems not happen with the > >> AC power supply connected. > >> > >> I installed both Mac OSX and FreeBSD (dual boot). It never happened in Mac > >> OSX. > >> > >> My dmesg: > >> http://pastebin.com/QjZmbGCB > >> > >> My sysctl hw.acpi: > >> > >> hw.acpi.acline: 0 > >> hw.acpi.battery.info_expire: 5 > >> hw.acpi.battery.units: 1 > >> hw.acpi.battery.state: 1 > >> hw.acpi.battery.time: 87 > >> hw.acpi.battery.life: 59 > >> hw.acpi.cpu.cx_lowest: C8 > >> hw.acpi.reset_video: 0 > >> hw.acpi.handle_reboot: 1 > >> hw.acpi.disable_on_reboot: 0 > >> hw.acpi.verbose: 0 > >> hw.acpi.s4bios: 0 > >> hw.acpi.sleep_delay: 1 > >> hw.acpi.suspend_state: S3 > >> hw.acpi.standby_state: NONE > >> hw.acpi.lid_switch_state: NONE > >> hw.acpi.sleep_button_state: S3 > >> hw.acpi.power_button_state: S5 > >> hw.acpi.supported_sleep_state: S3 S4 S5 > >> > >> > > Hi, > > > > Do you have a temperature sysctl? Usually FreeBSD will shutdown the system > > if the ACPI temperature exceeds some value. Maybe it would be better to > > reduce the CPU load when the temperature goes up instead of facing a > > shutdown? > > > > --HPS > > > The relevant information is probably found in dev.cpu. That is where all > temperature information is located as it is per-CPU, not per-system. Of > particular interest is dev.cpu.0.cx_lowest, dev.cpu.0.cx_supported, and > dev.cpu.0.freq_levels. A snapshot of dev.cpu.0 when the fan has cranked up, > but before shutdown would be nice, too. > > I see no hw.acpi.thermal information. This is very odd. These values > indicate what the system will do and is doing if it starts getting too hot. > > Is coretemp loaded? It is required to see the core temperatures and those > are almost certainly significant. It may account for the lack of thermal > information. Finally, a dmesg might be useful as it will tell us more about > just what thermal control techniques are enabled. > > Just to explain a bit on how this should work: when the temperature exceeds > some BIOS defined point, the system should "throttle" by pausing one of > every 8 clock cycles. If that does not fix the problem, the it rests for > two of every 8 and so on until the temperature is reduced. If it continues > to rise and reaches another BIOS set point, it will initiate an emergency > shutdown. If it reaches a CPU defined temperature, the power will shut off > immediately. Note that this is entirely a hardware function with no BIOS or > OS involvement. It should NEVER happen in normal operation as it is > triggered by a significant overtemp that threatens to destroy the CPU. I've > only seen it once when the CPU heat sink came loose on an old P4 system > several years ago. > > I should mention that I have zero experience with Apple hardware and it is > possible that they do some things differently than I have seen on other > hardware. > -- > Kevin Oberman, Part time kid herder and retired Network Engineer > E-mail: rkober...@gmail.com > PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683 I have had such problems many times with older hardware. In most cases "dried out" thermal conductive pad or grease was the reason overheating the CPU du to a ineffective thermal conductivity from the CPU's surface to the heat spreader/cooler. I had recently two laptops with such a phenomenon - using high-quality thermal grease solved the problem for my. In both cases, the former high-viscous thermal grease has become like dry mud. Same with pads.
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