Date: Fri, 13 Dec 2013 19:53:48 GMT From: R Tyler Croy <tyler@monkeypox.org> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/184757: Resume fails on the X200 when the C3 power mode is available and engaged Message-ID: <201312131953.rBDJrmce042652@oldred.freebsd.org> Resent-Message-ID: <201312132000.rBDK02p3085859@freefall.freebsd.org>
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>Number: 184757 >Category: kern >Synopsis: Resume fails on the X200 when the C3 power mode is available and engaged >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Dec 13 20:00:02 UTC 2013 >Closed-Date: >Last-Modified: >Originator: R Tyler Croy >Release: FreeBSD 10.0-PRERELEASE amd64 >Organization: >Environment: FreeBSD kiwi 10.0-PRERELEASE FreeBSD 10.0-PRERELEASE #4 r259211: Wed Dec 11 01:08:00 PST 2013 root@kiwi:/usr/obj/usr/src/sys/KIWI amd64 >Description: When tuning some of the performance and power settings, I tried enabling the C3 state as the "lowest" economy power setting. This works all well and good, *unless* I suspend while on battery after some period of idle activity /etc/rc.conf ----8<----8<----8<--- # Performance and power tuning taken from TuningPowerconsumption wiki performance_cx_lowest="C2" economy_cx_lowest="C3" ----8<----8<----8<--- /boot/loader.conf ----8<----8<----8<--- # Performance and power tuning taken from TuningPowerConsumption wiki ##################################################################### # Disable PCI bus devices we don't have something built into the kernel # for. hw.pci.do_power_nodriver=3 # Disable throttling that would be hidden by the C2 state hint.p4tcc.0.disabled=1 hint.acpi_throttle.0.disabled=1 # Enable clocks to make the C3 state viable hint.apic.0.clock=0 hint.atrtc.0.clock=0 # Reduce the interrupt rate to make C3 more effective kern.hz=100 ----8<----8<----8<--- >How-To-Repeat: * Enable the C3 state. * Suspend while on battery, typically after some period of inactivity, allowing the machine to enter C3 * Attempt to resume Observe the black screen on resume followed by a reboot a short time after that. >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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