Messages in this thread |  | | Date | Fri, 10 Apr 2015 08:19:44 +0200 | From | Jim Bos <> | Subject | Re: [PATCH] x86/ACPI: Fix regression caused by 16ee7b3dcc56 |
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On 04/10/2015 03:56 AM, Jiang Liu wrote: > On 2015/4/10 0:41, Jim Bos wrote: >> On 04/09/2015 12:15 PM, Jiang Liu wrote: >>> On 2015/4/8 23:51, Jim Bos wrote: >>>> On 04/08/2015 07:26 AM, Jiang Liu wrote: >>>>> On 2015/4/8 0:49, Jim Bos wrote: >>>>>> On 04/07/2015 04:34 PM, Jiang Liu wrote: > <snip> >>> Hi Jim, >>> I'm really confused. I can't even explain why my previous >>> patch fixes the issue on AMD geode board now:( >>> >>> For the Dell laptop, seems you have: >>> 1) build a kernel with Local APIC and IOAPIC enabled >>> 2) lapic is disabled by BIOS, so there's no ACPI MADT(APIC) >>> table at all. >>> That means the laptop is working with 8259 PICs only. >>> There's little change between 3.16 and 4.0 related to 8259. >>> >>> For the AMD geode board, I still think original code is right. >>> I can't explain why the patch fix the issue. >>> >>> So could you please help to: >>> 1) Try to enable lapic on Dell laptop in BIOS >>> 2) Dump acpi tables and dmesg on AMD board >>> >>> If that still doesn't help, I will try to send you some >>> debug patches to gather more info. >>> Thanks! >>> Gerry >>>> _ >>>> Jim >>>> >>> >> >> Gerry, >> >> As you mentioned your patch shouldn't make a difference, run some more >> tests, as it turns out: >> - geode system broken on 3.16+ up to and including 3.19, however, on >> plain 4.0-rc6 it works! Root cause appears to be there isn't an ACPI >> interrupt assigned in non-working kernels. >> - other system I got my hands on: Pentium(R) CPU G3220, broken on 3.19.0 >> when boot parameter 'nosmp' is specified, again no acpi entry in >> /proc/interrupts, working fine on 4.0-rc6 >> >> So obviously between 3.19 and 4.0-rc6 something got fixed here! > Hi Jim, > Yes, the bugfix patch should be: > commit 1ea76fbadd66("x86/irq: Fix regression caused by commit b568b8601f05") > >> The Dell laptop remains the only problem then on 4.0-rc6, there IS an >> acpi interrupt (but firing once apparently). >> There isn't an option in BIOS to enable LAPIC, however, when specifying >> 'lapic' as boot parameter I got interesting result, still not working >> and /proc/interrups still shows XT-PIC. Doing a diff between dmesg on >> 3.19 and 4.0-rc6 this pops out: >> >> -Local APIC disabled by BIOS -- you can enable it with "lapic" >> -APIC: disable apic facility >> -APIC: switched to apic NOOP >> +Local APIC disabled by BIOS -- reenabling. >> +Found and enabled local APIC! >> >> +Enabling APIC mode: Flat. Using 0 I/O APICs > What's the last know working kernel for Dell laptop? > Does it work as expected with v3.19 kernel? > Do you means this message is from plain v4.0-rc6 kernel? > Thanks! > Gerry > >> >> Jim >> > Last know working version on the Dell laptop is 3.16 and yes this message"
>> -Local APIC disabled by BIOS -- you can enable it with "lapic" >> -APIC: disable apic facility >> -APIC: switched to apic NOOP >> +Local APIC disabled by BIOS -- reenabling. >> +Found and enabled local APIC!
is from the v4.0-rc6 message. Full dmesg attached.
Jim.
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