Re: Brightness keys and booting the kernel

matt Fri, 04 May 2012 14:38:47 -0700

On 05/01/12 10:13, Nikolay Tychina wrote:

  >  Considering the fact that brightness keys work until kernel is loaded,
  >  is it possible to make them work
  >  after the kernel is booted in some simple way?
  >  I remember my previous laptop was able to control brightness without
  >  any acpi_* modules and disregarding
  >  OS running.


What make and model laptop?  What OS?  (this one, and the previous?)

% head -24 /var/run/dmesg.boot

should provide a clue or two.

cheers, Ian

This is Samsung RV511-S02 which runs FreeBSD 9-RELEASE, previous was
Acer Aspire 5520G running FreeBSD 8-STABLE until it burned away in
2010, and I couldn't find dmesg for it.

Regards


ACPI set debug layer 'ACPI_ALL_COMPONENTS ACPI_ALL_DRIVERS' level
'ACPI_LV_ERROR'
Copyright (c) 1992-2012 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 9.0-RELEASE #1: Thu Feb 23 18:33:29 MSK 2012
     nicholas@rv511:/usr/obj/usr/src/sys/GENERIC amd64
CPU: Intel(R) Core(TM) i3 CPU       M 380  @ 2.53GHz (2527.05-MHz K8-class CPU)
   Origin = "GenuineIntel"  Id = 0x20655  Family = 6  Model = 25  Stepping = 5
   
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
   
Features2=0x9ae3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,POPCNT>
   AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
   AMD Features2=0x1<LAHF>
   TSC: P-state invariant, performance statistics
real memory  = 4294967296 (4096 MB)
avail memory = 3940532224 (3757 MB)
Event timer "LAPIC" quality 600
ACPI APIC Table:<PTLTD        APIC>
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
FreeBSD/SMP: 1 package(s) x 2 core(s) x 2 SMT threads
  cpu0 (BSP): APIC ID:  0
  cpu1 (AP): APIC ID:  1
  cpu2 (AP): APIC ID:  4
  cpu3 (AP): APIC ID:  5
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I know that Thinkpads (obviously not the same but the information may beuseful) start in "BIOS" mode, where acpi does not handle most hotkeys,brightness etc. So the brightness keys work. As soon as acpi attaches,however, it "trapdoors" into ACPI mode, where it expects Windows orLinux drivers to handle hotkeys and call either acpi video extensions orother ACPI methods to initiate display changes and brightness. Have youtried using the acpi_video module?The reason it works during early kernel and prior on Thinkpads is due tothe fact it hasn't been "trapdoored" into ACPI mode yet.


Matt
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Re: Brightness keys and booting the kernel

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