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Message-ID: <CAMciSVUwy2cB4=hdX7Qki4Uc3maYdyrWa9t=_c9Uth=Pzh-KAg@mail.gmail.com>
Date: Sat, 22 Mar 2025 21:10:32 +0530
From: Naveen Kumar P <naveenkumar.parna@...il.com>
To: Armin Wolf <W_Armin@....de>
Cc: linux-acpi@...r.kernel.org, rafael@...nel.org,
linux-kernel@...r.kernel.org
Subject: Re: ACPI Error: AE_AML_LOOP_TIMEOUT in \_SB.PCI0.SBUS.RDWD & \_SB.PCI0.SBRG.ADP1._PSR
On Sat, Mar 22, 2025 at 3:02 AM Armin Wolf <W_Armin@....de> wrote:
>
> Am 19.03.25 um 12:29 schrieb Naveen Kumar P:
>
> > Hi all,
> >
> > I am encountering repeated AE_AML_LOOP_TIMEOUT errors in the ACPI RDWD
> > & \_SB.PCI0.SBRG.ADP1._PSR methods. Below are relevant log entries
> > from my system running Linux kernel 6.13.0+:
> >
> > [77998.038653]
> > Initialized Local Variables for Method [RDWD]:
> > [77998.038691] Local1: 00000000d0fe9fee <Obj> Integer
> > 0000000000000015
> > [77998.038862] Local6: 00000000f41c1645 <Obj> Integer
> > 0000000000000000
> > [77998.039031] Local7: 0000000040665c5c <Obj> Integer
> > 000000000000AA55
> >
> > [77998.039237] Initialized Arguments for Method [RDWD]: (2 arguments
> > defined for method invocation)
> > [77998.039273] Arg0: 00000000397dc53d <Obj> Integer
> > 0000000000000014
> > [77998.039442] Arg1: 000000001099e334 <Obj> Integer
> > 0000000000000002
> >
> > [77998.039673] ACPI Error: Aborting method \_SB.PCI0.SBUS.RDWD due to
> > previous error (AE_AML_LOOP_TIMEOUT) (20240827/psparse-529)
> > [77998.040455] ACPI Error: Aborting method \_SB.PCI0.SBRG.ADP1._PSR
> > due to previous error (AE_AML_LOOP_TIMEOUT) (20240827/psparse-529)
> > [77998.043659] ACPI: \_SB_.PCI0.SBRG.ADP1: Error reading AC Adapter
> > state: AE_AML_LOOP_TIMEOUT
> >
> > [78028.442980]
> > Initialized Local Variables for Method [RDWD]:
> > [78028.443019] Local1: 00000000898a9a7e <Obj> Integer
> > 0000000000000017
> > [78028.443192] Local6: 000000000cf0c853 <Obj> Integer
> > 0000000000000000
> > [78028.443362] Local7: 00000000bb4aa65f <Obj> Integer
> > 000000000000AA55
> >
> > [78028.443569] Initialized Arguments for Method [RDWD]: (2 arguments
> > defined for method invocation)
> > [78028.443606] Arg0: 00000000ef8d445b <Obj> Integer
> > 0000000000000016
> > [78028.443775] Arg1: 000000006cacc887 <Obj> Integer
> > 0000000000000003
> >
> > [78028.444006] ACPI Error: Aborting method \_SB.PCI0.SBUS.RDWD due to
> > previous error (AE_AML_LOOP_TIMEOUT) (20240827/psparse-529)
> > [78028.446366] ACPI Error: Aborting method \_SB.PCI0.SBRG.ADP1._PSR
> > due to previous error (AE_AML_LOOP_TIMEOUT) (20240827/psparse-529)
> > [78028.451179] ACPI: \_SB_.PCI0.SBRG.ADP1: Error reading AC Adapter
> > state: AE_AML_LOOP_TIMEOUT
> >
> > [78032.877472]
> > Initialized Local Variables for Method [RDWD]:
> > [78032.877509] Local1: 00000000cf6291ae <Obj> Integer
> > 0000000000000017
> > [78032.877682] Local6: 0000000026aa8a7a <Obj> Integer
> > 0000000000000003
> > [78032.877851] Local7: 00000000acfa20e0 <Obj> Integer
> > 000000000000AA55
> >
> > [78032.878058] Initialized Arguments for Method [RDWD]: (2 arguments
> > defined for method invocation)
> > [78032.878094] Arg0: 00000000a186096f <Obj> Integer
> > 0000000000000016
> > [78032.878262] Arg1: 00000000d0e1eefe <Obj> Integer
> > 0000000000000003
> >
> > [78032.878492] ACPI Error: Aborting method \_SB.PCI0.SBUS.RDWD due to
> > previous error (AE_AML_LOOP_TIMEOUT) (20240827/psparse-529)
> > [78032.881011] ACPI Error: Aborting method \_SB.PCI0.SBRG.ADP1._PSR
> > due to previous error (AE_AML_LOOP_TIMEOUT) (20240827/psparse-529)
> > [78032.883061] ACPI: \_SB_.PCI0.SBRG.ADP1: Error reading AC Adapter
> > state: AE_AML_LOOP_TIMEOUT
> >
> >
> > This issue appears randomly, affecting the RDWD method, which is
> > likely responsible for reading data from a bus, and consequently
> > causing the _PSR method (power state read) to fail.
> >
> >
> > Questions:
> > 1. What typically causes AE_AML_LOOP_TIMEOUT errors?
>
> AFAIK this error is caused by a while loop taking too long to finish. I suspect that
> the ACPI bytecode tries to wait for a non-responsive hardware device.
>
> > 2. Could these ACPI errors impact PCI device access?
> > Since the error originates from _SB.PCI0.SBUS.RDWD, could this failure
> > affect PCI device communication or cause failures when accessing PCI
> > devices?
>
> I do not think so, the SBUS device is likely just a SMBus controller attached to the PCI bus.
>
> >
> > 3. Could this be a firmware/BIOS issue?If so, what tools or steps
> > should I use to verify and debug the ACPI tables?
>
> It is either a hardware issue or a BIOS bug. Can you share the output of the "acpidump" utility
> provided by the ACPICA project? Many Linux distributions already package ACPICA in their package repositories.
I have attached the acpi.tar.gz file as requested. This archive
contains the output from the "acpidump" utility. Below is a list of
the files included in the archive:
ls -ltr acpi
total 760
-rw-rw-r-- 1 murphy murphy 205609 Mar 19 18:30 acpi_tables.txt
-rw-r--r-- 1 root root 60 Mar 19 18:31 mcfg.dat
-rw-r--r-- 1 root root 132 Mar 19 18:31 apic.dat
-rw-r--r-- 1 root root 656 Mar 19 18:31 ssdt2.dat
-rw-r--r-- 1 root root 66 Mar 19 18:31 uefi.dat
-rw-r--r-- 1 root root 36402 Mar 19 18:31 dsdt.dat
-rw-r--r-- 1 root root 260 Mar 19 18:31 lpit.dat
-rw-r--r-- 1 root root 378 Mar 19 18:31 ssdt3.dat
-rw-r--r-- 1 root root 268 Mar 19 18:31 facp.dat
-rw-r--r-- 1 root root 68 Mar 19 18:31 fpdt.dat
-rw-r--r-- 1 root root 1891 Mar 19 18:31 ssdt1.dat
-rw-r--r-- 1 root root 332 Mar 19 18:31 csrt.dat
-rw-r--r-- 1 root root 56 Mar 19 18:31 hpet.dat
-rw-r--r-- 1 root root 64 Mar 19 18:31 facs.dat
-rw-r--r-- 1 root root 890 Mar 19 18:31 ssdt4.dat
-rw-r--r-- 1 root root 141 Mar 19 18:31 ssdt7.dat
-rw-r--r-- 1 root root 1075 Mar 19 18:31 ssdt5.dat
-rw-r--r-- 1 root root 351 Mar 19 18:31 ssdt6.dat
-rw-rw-r-- 1 murphy murphy 5919 Mar 19 18:31 apic.dsl
-rw-rw-r-- 1 murphy murphy 8131 Mar 19 18:31 csrt.dsl
-rw-rw-r-- 1 murphy murphy 337832 Mar 19 18:31 dsdt.dsl
-rw-rw-r-- 1 murphy murphy 10103 Mar 19 18:31 facp.dsl
-rw-rw-r-- 1 murphy murphy 1368 Mar 19 18:31 facs.dsl
-rw-rw-r-- 1 murphy murphy 1802 Mar 19 18:31 fpdt.dsl
-rw-rw-r-- 1 murphy murphy 1863 Mar 19 18:31 hpet.dsl
-rw-rw-r-- 1 murphy murphy 7523 Mar 19 18:31 lpit.dsl
-rw-rw-r-- 1 murphy murphy 1524 Mar 19 18:31 mcfg.dsl
-rw-rw-r-- 1 murphy murphy 9996 Mar 19 18:31 ssdt1.dsl
-rw-rw-r-- 1 murphy murphy 7692 Mar 19 18:31 ssdt2.dsl
-rw-rw-r-- 1 murphy murphy 4296 Mar 19 18:31 ssdt3.dsl
-rw-rw-r-- 1 murphy murphy 8290 Mar 19 18:31 ssdt4.dsl
-rw-rw-r-- 1 murphy murphy 16968 Mar 19 18:31 ssdt5.dsl
-rw-rw-r-- 1 murphy murphy 2843 Mar 19 18:31 ssdt6.dsl
-rw-rw-r-- 1 murphy murphy 1337 Mar 19 18:31 ssdt7.dsl
-rw-rw-r-- 1 murphy murphy 1383 Mar 19 18:31 uefi.dsl
Please let me know if you need any further details or additional
information to assist in debugging the ACPI tables.
Thank you for your help.
>
> >
> > 4. Is there a recommended workaround to mitigate this issue?
>
> You can check if a BIOS update is available for your device.
>
> >
> > 4. How can I debug this further?I can enable additional ACPI debugging
> > logs or provide dumps of ACPI tables if necessary.
>
> I can take a look at the \_SB.PCI0.SBUS.RDWD method inside the ACPI table dumps
> to see where the error is coming from.
>
> Thanks,
> Armin Wolf
>
> >
> > Any guidance on resolving or further diagnosing this issue would be
> > highly appreciated.
> >
> > Best regards,
> > Naveen
> >
Download attachment "acpi.tar.gz" of type "application/x-gzip" (117914 bytes)
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