Date: Fri, 27 Jun 2014 16:48:57 -0400 From: Anthony Jenkins <Anthony.B.Jenkins@att.net> To: Ian Smith <smithi@nimnet.asn.au> Cc: Bykov Vladislav <envolyse@gmail.com>, freebsd-acpi@freebsd.org Subject: Re: Impossible shutdown Message-ID: <53ADD8B9.5060401@att.net> In-Reply-To: <20140627143031.P50382@sola.nimnet.asn.au> References: <20140625222911.GA34447@hellgate.Dlink> <53AC07A3.7070904@att.net> <20140627143031.P50382@sola.nimnet.asn.au>
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On 06/27/2014 01:16, Ian Smith wrote:
> On Thu, 26 Jun 2014 07:44:35 -0400, Anthony Jenkins wrote:
> > On 06/25/2014 18:29, Bykov Vladislav wrote:
> > > Hello.
> > >
> > > I have a problem with ACPI on HP Envy 4 that causes in impossible shutdown. It
> > > reaches an error while prepairing to shutdown, and reboots the machine.
> > >
> > > I already did sent a bug report about 2-3 months ago, but things doesn't seems
> > > to move on.
> > >
> > > Here's an error when booting the machine:
> > >
> > > ACPI Error: No handler for Region [RCM0] (0xfffffe0002b0f800) [SystemCMOS] (20110527/evregion-421)
> > > ACPI Error: Region SystemCMOS (ID=5) has no handler (20110527/exfldio-310)
> > > ACPI Error: Method parse/execution failed [\134_SB_.WMID.ESDT] (Node 0xfffffe0002aee440), AE_NOT_EXIST (20110527/psparse-560)
> > > ACPI Error: Method parse/execution failed [\134_SB_.PCI0.LPCB.EC0_._Q42] (Node 0xfffffe0002b16d40), AE_NOT_EXIST (20110527/psparse-560)
> > > acpi_ec0: evaluation of query method _Q42 failed: AE_NOT_EXIST
> > >
> > > And here's the one when I'm trying to shut it down:
> > >
> > > usbus2: Controller shutdown complete
> > > ACPI Error: No handler for Region [RCM0] (0xfffffe0002b15900) [SystemCMOS] (20110527/evregion-421)
> > > ACPI Error: Region SystemCMOS (ID=5) has no handler (20110527/exfldio-310)
> > > ACPI Error: Method parse/execution failed [\_SB_.WMID.ESDT] (Node 0xfffffe0002af5800), AE_NOT_EXIST (20110527/psparse-560)
> > > ACPI Error: Method parse/execution failed [\_PTS] (Node 0xfffffe0002af86c0), AE_NOT_EXIST (20110527/psparse-560)
> > > acpi0: AcpiEnterSleepStatePrep failed - AE_NOT_EXIST
> > > Rebooting...
> > >
> > > I've tried FreeBSD 9, FreeBSD 10, and -CURRENT. All have the same problem.
> >
> > Here's a case where my patch to implement the SystemCMOS region
> > handler should help; it allows my HP Envy to power down and allows it
> > to suspend/resume except the LCD backlight doesn't come back when
> > resuming. Biggest problem with the patch IMHO is I'm stealing
> > ("borrowing") from the real time clock (RTC) I/O region, but I don't
> > think we have an "actual" FreeBSD driver for that.
> >
> > Reposting here, or search this list for "Naive implementation of
> > AcpiExCmosSpaceHandler", let me know if it doesn't apply cleanly to
> > your version of FreeBSD . I've posted it upstream to the acpica
> > mailing list, but no response.
> >
> > diff --git a/source/components/events/evhandler.c b/source/components/events/evhandler.c
>
> Interesting. I wonder if this is needed for reading the RTC for the
> time on boot, and writing it back on shutdown - which I would have
> thought too generic to have left out on any machine? Or is this perhaps
> retrieving at boot then restoring at shutdown some other system-specific
> information in NVRAM?
It's the latter; they (presumably the BIOS ACPI shutdown/resume methods) are just reading/writing locations in the non-volatile CMOS storage, which just happens to be shared with the RTC. The RTC proper has some 16 bytes of registers which represent the real time clock - the rest are presumably storage, though the platform could probably do whatever it wants with various locations.
> If the latter, then the usage in /sys/dev/acpi_support/acpi_ibm.c
> revealed below might illustrate another way of dealing with this?
>
> % find /sys/ -type f -exec egrep -H 'rtcin|writertc' {} \; | grep -v drm_mode_set_crtcinfo
>
> shows everything using the rtcin() and writertc() functions, implemented
> for x86 at least in /sys/x86/isa/atrtc.c .. but I have no idea whether
> you can access those functions from where / when you're tinkering here.
This is the way I think it's /supposed/ to be done - from my skimming of one of the ACPI specs, there's a PNP identifier for the CMOS/RTC device. If that identifier is probed, the OS should install a SystemCMOS region handler (which would use the I/O methods of the RTC driver which takes care of locking/consistency).
> Yours looks more likely portable for upstream acpica, but it also looks
> potentially quite dangerous 'in the wrong hands' :)
Personally I don't think my patch can live upstream in acpica-land because it can step on the toes of an existing OS CMOS/RTC driver talking to the RTC I/O ports. I just don't know how to do all this with our rtc driver yet, particularly the PNPxxxxxx stuff. I'll look into it when I get some free cycles.
> cheers, Ian
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