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Message-ID: <CAPz6YkVkB5JepBoL25DqZ8JHC6rgvQcLzs4wsN+a7Vb1NFmNkw@mail.gmail.com> Date: Tue, 14 May 2013 21:34:41 -0700 From: Sonny Rao <sonnyrao@...omium.org> To: Zhang Rui <rui.zhang@...el.com> Cc: linux-pm@...r.kernel.org, Sameer Nanda <snanda@...omium.org>, "Triplett, Josh" <josh.triplett@...el.com>, Olof <olofj@...omium.org>, len.brown@...el.com, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: Fans at full speed after resume On Tue, May 14, 2013 at 9:29 PM, Zhang Rui <rui.zhang@...el.com> wrote: > On Wed, 2013-05-15 at 12:26 +0800, Zhang Rui wrote: >> please >> >> On Tue, 2013-05-14 at 21:18 -0700, Sonny Rao wrote: >> > Hi, I've seen a regression in kernels since 3.7 on x86 devices where >> > the kernel turns the system fans on to max speed after resuming from >> > ram. Other people have noticed it as well, for example see >> > https://bugzilla.redhat.com/show_bug.cgi?id=895276 >> > >> please check if this is a duplicate of bug >> https://bugzilla.kernel.org/show_bug.cgi?id=56591 > or you can try 3.10-rc1 to see if the problem still exists or not. Ok, I patched in the fix from that bugzilla -- 928c5edbe6f7cb0d1c71bc2353d091bc5b114fe3 but I'm still seeing the issue, I'll try 3.10-rc1 next > > thanks, > rui >> > For example on the Samsung 550 Chromebook, we have one thermal zone >> > and have 5 cooling_devices, 0-4, which correspond to 5 possible fan >> > speeds. Under typical idle, only cooling_device4 and maybe >> > cooling_device3 are active, depending on temperature: >> > >> > cat /sys/class/thermal/cooling_device[01234]/cur_state >> > /sys/class/thermal/thermal_zone0/temp >> > 0 >> > 0 >> > 0 >> > 0 >> > 1 >> > 57000 >> > >> > however after a suspend/resume, we see that cooling_devices 0 and 1 >> > become active: >> > cat /sys/class/thermal/cooling_device[01234]/cur_state >> > /sys/class/thermal/thermal_zone0/temp >> > 1 >> > 1 >> > 0 >> > 0 >> > 1 >> > 54000 >> > >> > and it seems to stay that way, even though the temperature is low >> > enough that the fan shouldn't be running at that speed. If I manually >> > disable cooling_devices 0 and 1 then fan control works normally again. >> > >> > I started bisecting it and was able to do so up until this commit: >> > commit 29b19e250434c6193c8b8e4c34c9c6284dd4f101 >> > Merge: 125c4c7 c072fed >> > Author: Len Brown <len.brown@...el.com> >> > AuthorDate: Tue Oct 9 01:35:52 2012 -0400 >> > Commit: Len Brown <len.brown@...el.com> >> > CommitDate: Tue Oct 9 01:35:52 2012 -0400 >> > >> > Merge branch 'release' of >> > git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux into >> > thermal >> > >> > unfortunately, I'm not able to successfully do a suspend/resume on the >> > commits in that merge, so I wasn't able to bisect down to the exact >> > commit. >> > >> > I did confirm that one parent of the merge is okay: commit >> > 125c4c706b680c7831f0966ff873c1ad0354ec25 idr: rename MAX_LEVEL to >> > MAX_IDR_LEVEL >> > >> > so I think it falls somewhere in this list of commits: >> > c072fed95c9855a920c114d7fa3351f0f54ea06e...e3f25e6e5836c4790fbe395ff42e241f372d859d >> > >> > c072fed9 thermal: Exynos: Fix NULL pointer dereference in >> > exynos_unregister_thermal() >> > a4b6fec9 Thermal: Fix bug on cpu_cooling, cooling device's id conflict problem. >> > 79e093c3 thermal: exynos: Use devm_* functions >> > 17be868e ARM: exynos: add thermal sensor driver platform data support >> > 7e0b55e6 thermal: exynos: register the tmu sensor with the kernel thermal layer >> > f22d9c03c thermal: exynos5: add exynos5250 thermal sensor driver support >> > c48cbba6 hwmon: exynos4: move thermal sensor driver to driver/thermal directory >> > 02361418 thermal: add generic cpufreq cooling implementation >> > a7a3b8c8 Fix a build error. >> > 204dd1d3 thermal: Fix potential NULL pointer accesses >> > 1e426ffdd thermal: add Renesas R-Car thermal sensor support >> > 79a49168 thermal: fix potential out-of-bounds memory access >> > f4a821ce6 Thermal: Introduce locking for cdev.thermal_instances list. >> > 908b9fb79 Thermal: Unify the code for both active and passive cooling >> > ce119f832 Thermal: Introduce simple arbitrator for setting device cooling state >> > b5e4ae62 Thermal: List thermal_instance in thermal_cooling_device. >> > cddf31b3b Thermal: Rename thermal_instance.node to thermal_instance.tz_node. >> > 2d374139 Thermal: Rename thermal_zone_device.cooling_devices >> > b81b6ba3 Thermal: rename structure thermal_cooling_device_instance to >> > thermal_instance >> > 4ae46befb Thermal: Introduce thermal_zone_trip_update() >> > 1b7ddb84 Thermal: Remove tc1/tc2 in generic thermal layer. >> > 601f3d424 Thermal: Introduce .get_trend() callback. >> > 9d99842f9 Thermal: set upper and lower limits >> > 74051ba5 Thermal: Introduce cooling states range support >> > >> > When I get time, I'll try to rebase those commits onto the IDR commit >> > and see if I can get a better bisect. Any insights into the problem >> > would be appreciated, thanks. >> >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-pm" in >> the body of a message to majordomo@...r.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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