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    Subjecti915/kms/backlight-combo mode problem (was: Re: Linux 2.6.39-rc5)
    Hi,

    I have the problem described in the thread here
    (https://lkml.org/lkml/2011/4/29/217) where the backlight
    values are reversed so although stuff is displayed on the screen, the
    backlight is off. This occurs with kernels from about 2.6.39 onwards.

    After booting a "broken" kernel (>~2.6.39), the backlight can be lit
    temporarily with:
    setpci -s 00:02.0 F4.B=0
    and then turned off with:
    setpci -s 00:02.0 F4.B=FF

    Yesterday I tried this patch, https://lkml.org/lkml/2011/4/30/37 by
    manually applying it to the 3.2.1
    kernel source - this fixes the problem.

    ** Unfortunately the LKML thread stops after this patch and given that
    the problem is still present in the latest source, this code wasn't
    pushed into the kernel. Is there a reason for this or was it just
    forgotten about? What can I do about this? I am happy to make a git
    patch with the latest source if this will help.

    If it is relevant, the backlight brightness controls (Fn-left, Fn-right)
    have never worked on any kernel
    version, although they are picked up by acpi_listen.

    The machine is a Packard Bell XS butterfly laptop, 11.6", 1.3GHz celeron
    743, 2gb ram, etc.
    As per the posting guidelines, here is loads of info about it:

    # dmesg|grep acer

    [ 9.820622] acer_wmi: Acer Laptop ACPI-WMI Extras
    [ 9.821841] acer_wmi: Function bitmap for Communication Device: 0x81
    [ 9.822005] acer_wmi: Brightness must be controlled by generic video
    driver


    # lspci -v

    00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory
    Controller Hub (rev 07)
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: bus master, fast devsel, latency 0
    Capabilities: [e0] Vendor Specific Information: Len=0a <?>
    Kernel driver in use: agpgart-intel

    00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series
    Chipset Integrated Graphics Controller (rev 07) (prog-if 00 [VGA
    controller])
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: bus master, fast devsel, latency 0, IRQ 47
    Memory at 90000000 (64-bit, non-prefetchable) [size=4M]
    Memory at 80000000 (64-bit, prefetchable) [size=256M]
    I/O ports at 50d0 [size=8]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [d0] Power Management version 3
    Kernel driver in use: i915

    00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset
    Integrated Graphics Controller (rev 07)
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: bus master, fast devsel, latency 0
    Memory at 93400000 (64-bit, non-prefetchable) [size=1M]
    Capabilities: [d0] Power Management version 3

    00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
    Controller #4 (rev 03) (prog-if 00 [UHCI])
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: bus master, medium devsel, latency 0, IRQ 20
    I/O ports at 50a0 [size=32]
    Capabilities: [50] PCI Advanced Features
    Kernel driver in use: uhci_hcd

    00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
    Controller #2 (rev 03) (prog-if 20 [EHCI])
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: bus master, medium devsel, latency 0, IRQ 21
    Memory at 96705c00 (32-bit, non-prefetchable) [size=1K]
    Capabilities: [50] Power Management version 2
    Capabilities: [58] Debug port: BAR=1 offset=00a0
    Capabilities: [98] PCI Advanced Features
    Kernel driver in use: ehci_hcd

    00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
    Controller (rev 03)
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: bus master, fast devsel, latency 0, IRQ 45
    Memory at 96700000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: [50] Power Management version 2
    Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
    Capabilities: [100] Virtual Channel
    Capabilities: [130] Root Complex Link
    Kernel driver in use: snd_hda_intel

    00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express
    Port 1 (rev 03) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
    I/O behind bridge: 00004000-00004fff
    Memory behind bridge: 95700000-966fffff
    Prefetchable memory behind bridge:
    0000000090400000-00000000913fffff
    Capabilities: [40] Express Root Port (Slot+), MSI 00
    Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [90] Subsystem: Acer Incorporated [ALI] Device 034b
    Capabilities: [a0] Power Management version 2
    Capabilities: [100] Virtual Channel
    Capabilities: [180] Root Complex Link
    Kernel driver in use: pcieport

    00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express
    Port 2 (rev 03) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=04, subordinate=04, sec-latency=0
    I/O behind bridge: 00003000-00003fff
    Memory behind bridge: 94600000-956fffff
    Prefetchable memory behind bridge:
    0000000091400000-00000000923fffff
    Capabilities: [40] Express Root Port (Slot+), MSI 00
    Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [90] Subsystem: Acer Incorporated [ALI] Device 034b
    Capabilities: [a0] Power Management version 2
    Capabilities: [100] Virtual Channel
    Capabilities: [180] Root Complex Link
    Kernel driver in use: pcieport

    00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express
    Port 3 (rev 03) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=05, subordinate=05, sec-latency=0
    I/O behind bridge: 00001000-00002fff
    Memory behind bridge: 93500000-945fffff
    Prefetchable memory behind bridge:
    0000000092400000-00000000933fffff
    Capabilities: [40] Express Root Port (Slot+), MSI 00
    Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [90] Subsystem: Acer Incorporated [ALI] Device 034b
    Capabilities: [a0] Power Management version 2
    Capabilities: [100] Virtual Channel
    Capabilities: [180] Root Complex Link
    Kernel driver in use: pcieport

    00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
    Controller #1 (rev 03) (prog-if 00 [UHCI])
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: medium devsel, IRQ 23
    I/O ports at 5080 [size=32]
    Capabilities: [50] PCI Advanced Features
    Kernel driver in use: uhci_hcd

    00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
    Controller #2 (rev 03) (prog-if 00 [UHCI])
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: medium devsel, IRQ 19
    I/O ports at 5060 [size=32]
    Capabilities: [50] PCI Advanced Features
    Kernel driver in use: uhci_hcd

    00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
    Controller #3 (rev 03) (prog-if 00 [UHCI])
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: bus master, medium devsel, latency 0, IRQ 20
    I/O ports at 5040 [size=32]
    Capabilities: [50] PCI Advanced Features
    Kernel driver in use: uhci_hcd

    00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
    Controller #1 (rev 03) (prog-if 20 [EHCI])
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: medium devsel, IRQ 23
    Memory at 96705800 (32-bit, non-prefetchable) [size=1K]
    Capabilities: [50] Power Management version 2
    Capabilities: [58] Debug port: BAR=1 offset=00a0
    Capabilities: [98] PCI Advanced Features
    Kernel driver in use: ehci_hcd

    00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
    (prog-if 01 [Subtractive decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=06, subordinate=06, sec-latency=32
    Capabilities: [50] Subsystem: Acer Incorporated [ALI] Device 034b

    00:1f.0 ISA bridge: Intel Corporation ICH9M-E LPC Interface Controller
    (rev 03)
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: bus master, medium devsel, latency 0
    Capabilities: [e0] Vendor Specific Information: Len=0c <?>

    00:1f.2 SATA controller: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E)
    4 port SATA Controller [AHCI mode] (rev 03) (prog-if 01 [AHCI 1.0])
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 43
    I/O ports at 50c8 [size=8]
    I/O ports at 50dc [size=4]
    I/O ports at 50c0 [size=8]
    I/O ports at 50d8 [size=4]
    I/O ports at 5020 [size=32]
    Memory at 96705000 (32-bit, non-prefetchable) [size=2K]
    Capabilities: [80] MSI: Enable+ Count=1/16 Maskable- 64bit-
    Capabilities: [70] Power Management version 3
    Capabilities: [a8] SATA HBA v1.0
    Capabilities: [b0] PCI Advanced Features
    Kernel driver in use: ahci

    00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller
    (rev 03)
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: medium devsel, IRQ 18
    Memory at 96706000 (64-bit, non-prefetchable) [size=256]
    I/O ports at 5000 [size=32]
    Kernel driver in use: i801_smbus

    00:1f.6 Signal processing controller: Intel Corporation 82801I (ICH9
    Family) Thermal Subsystem (rev 03)
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: fast devsel, IRQ 11
    Memory at 96704000 (64-bit, non-prefetchable) [size=4K]
    Capabilities: [50] Power Management version 3

    04:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000
    Subsystem: Intel Corporation Centrino Wireless-N 1000 BGN
    Flags: bus master, fast devsel, latency 0, IRQ 44
    Memory at 94600000 (64-bit, non-prefetchable) [size=8K]
    Capabilities: [c8] Power Management version 3
    Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [e0] Express Endpoint, MSI 00
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [140] Device Serial Number 00-1e-64-ff-ff-3a-4c-ec
    Kernel driver in use: iwlwifi

    05:00.0 Ethernet controller: Atheros Communications Inc. AR8131 Gigabit
    Ethernet (rev c0)
    Subsystem: Acer Incorporated [ALI] Device 034b
    Flags: bus master, fast devsel, latency 0, IRQ 46
    Memory at 93500000 (64-bit, non-prefetchable) [size=256K]
    I/O ports at 1000 [size=128]
    Capabilities: [40] Power Management version 3
    Capabilities: [48] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [58] Express Endpoint, MSI 00
    Capabilities: [6c] Vital Product Data
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [180] Device Serial Number ff-0b-61-4b-70-5a-b6-ff
    Kernel driver in use: atl1c


    # cat /proc/cpuinfo

    processor : 0
    vendor_id : GenuineIntel
    cpu family : 6
    model : 23
    model name : Intel(R) Celeron(R) CPU 743 @ 1.30GHz
    stepping : 10
    microcode : 0xa07
    cpu MHz : 1296.810
    cache size : 1024 KB
    fpu : yes
    fpu_exception : yes
    cpuid level : 13
    wp : yes
    flags : 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 tm pbe syscall
    nx lm constant_tsc up arch_perfmon pebs bts rep_good nopl aperfmperf pni
    dtes64 monitor ds_cpl tm2 ssse3 cx16 xtpr pdcm xsave lahf_lm dts
    bogomips : 2593.62
    clflush size : 64
    cache_alignment : 64
    address sizes : 36 bits physical, 48 bits virtual
    power management:


    # cat /proc/modules

    aes_x86_64 7760 3 - Live 0xffffffffa0089000
    aes_generic 27055 1 aes_x86_64, Live 0xffffffffa007f000
    mperf 1429 0 - Live 0xffffffffa0075000
    cpufreq_userspace 2152 0 - Live 0xffffffffa0071000
    cpufreq_powersave 994 0 - Live 0xffffffffa006d000
    cpufreq_stats 3093 0 - Live 0xffffffffa0069000
    cpufreq_conservative 5057 0 - Live 0xffffffffa0035000
    bluetooth 78815 2 - Live 0xffffffffa0002000
    i915 376275 2 - Live 0xffffffffa0721000
    drm_kms_helper 28203 1 i915, Live 0xffffffffa0714000
    drm 199595 3 i915,drm_kms_helper, Live 0xffffffffa06cd000
    i2c_algo_bit 4834 1 i915, Live 0xffffffffa06c8000
    uinput 6725 1 - Live 0xffffffffa06c3000
    fuse 58861 1 - Live 0xffffffffa06ac000
    nfsd 212927 2 - Live 0xffffffffa066a000
    exportfs 3447 1 nfsd, Live 0xffffffffa0666000
    nfs 264646 0 - Live 0xffffffffa0610000
    lockd 66446 2 nfsd,nfs, Live 0xffffffffa05f7000
    fscache 41009 1 nfs, Live 0xffffffffa05e4000
    auth_rpcgss 37737 2 nfsd,nfs, Live 0xffffffffa05d4000
    nfs_acl 2317 2 nfsd,nfs, Live 0xffffffffa05d0000
    sunrpc 196478 6 nfsd,nfs,lockd,auth_rpcgss,nfs_acl, Live 0xffffffffa058a000
    loop 15447 0 - Live 0xffffffffa0582000
    joydev 9152 0 - Live 0xffffffffa057c000
    snd_hda_codec_hdmi 22257 1 - Live 0xffffffffa0571000
    snd_hda_codec_realtek 197108 1 - Live 0xffffffffa0536000
    arc4 1353 2 - Live 0xffffffffa0532000
    snd_hda_intel 23473 3 - Live 0xffffffffa0526000
    snd_hda_codec 93483 3
    snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel, Live
    0xffffffffa0501000
    snd_hwdep 5752 1 snd_hda_codec, Live 0xffffffffa04fb000
    snd_pcm 73041 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec, Live
    0xffffffffa04df000
    snd_seq 46164 0 - Live 0xffffffffa04cc000
    snd_timer 18682 2 snd_pcm,snd_seq, Live 0xffffffffa04c2000
    snd_seq_device 5829 1 snd_seq, Live 0xffffffffa04bd000
    iwlwifi 165948 0 - Live 0xffffffffa0487000
    snd 60683 15
    snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_seq,snd_timer,snd_seq_device,
    Live 0xffffffffa046e000
    uvcvideo 53221 0 - Live 0xffffffffa045c000
    soundcore 6558 1 snd, Live 0xffffffffa0456000
    videodev 79468 1 uvcvideo, Live 0xffffffffa0439000
    mac80211 201126 1 iwlwifi, Live 0xffffffffa03f6000
    i2c_i801 7770 0 - Live 0xffffffffa03f0000
    psmouse 56724 0 - Live 0xffffffffa03da000
    cfg80211 146500 2 iwlwifi,mac80211, Live 0xffffffffa03a8000
    iTCO_wdt 12072 0 - Live 0xffffffffa03a0000
    acer_wmi 20155 0 - Live 0xffffffffa0396000
    v4l2_compat_ioctl32 7727 1 videodev, Live 0xffffffffa0391000
    mxm_wmi 1851 0 - Live 0xffffffffa038d000
    sparse_keymap 3594 1 acer_wmi, Live 0xffffffffa0389000
    iTCO_vendor_support 2797 1 iTCO_wdt, Live 0xffffffffa0385000
    pcspkr 1830 0 - Live 0xffffffffa0381000
    evdev 8569 16 - Live 0xffffffffa0373000
    serio_raw 4177 0 - Live 0xffffffffa036e000
    i2c_core 23165 6 i915,drm_kms_helper,drm,i2c_algo_bit,videodev,i2c_i801,
    Live 0xffffffffa0362000
    snd_page_alloc 7422 2 snd_hda_intel,snd_pcm, Live 0xffffffffa035c000
    rfkill 16037 4 bluetooth,cfg80211,acer_wmi, Live 0xffffffffa0353000
    wmi 9150 2 acer_wmi,mxm_wmi, Live 0xffffffffa0345000
    battery 6802 0 - Live 0xffffffffa0340000
    ac 2438 0 - Live 0xffffffffa033c000
    button 5105 1 i915, Live 0xffffffffa032f000
    video 12154 1 i915, Live 0xffffffffa0327000
    processor 27867 1 - Live 0xffffffffa02f3000
    ext4 386181 2 - Live 0xffffffffa0278000
    mbcache 6317 1 ext4, Live 0xffffffffa0272000
    jbd2 70425 1 ext4, Live 0xffffffffa0256000
    crc16 1643 1 ext4, Live 0xffffffffa0252000
    sr_mod 13275 0 - Live 0xffffffffa0246000
    sd_mod 30692 4 - Live 0xffffffffa0239000
    cdrom 33723 1 sr_mod, Live 0xffffffffa022b000
    crc_t10dif 1499 1 sd_mod, Live 0xffffffffa0227000
    uhci_hcd 18980 0 - Live 0xffffffffa021e000
    ahci 19800 3 - Live 0xffffffffa0214000
    libahci 20328 1 ahci, Live 0xffffffffa020a000
    libata 169193 2 ahci,libahci, Live 0xffffffffa01ca000
    scsi_mod 190814 3 sr_mod,sd_mod,libata, Live 0xffffffffa0142000
    ehci_hcd 33755 0 - Live 0xffffffffa01bc000
    thermal 8342 0 - Live 0xffffffffa0199000
    thermal_sys 14742 3 video,processor,thermal, Live 0xffffffffa0191000
    atl1c 27404 0 - Live 0xffffffffa0185000
    usbcore 146444 4 uvcvideo,uhci_hcd,ehci_hcd, Live 0xffffffffa0039000
    usb_common 1117 1 usbcore, Live 0xffffffffa0000000


    # cat /proc/ioports

    0000-0cf7 : PCI Bus 0000:00
    0000-001f : dma1
    0020-0021 : pic1
    0040-0043 : timer0
    0050-0053 : timer1
    0060-0060 : keyboard
    0062-0062 : EC data
    0064-0064 : keyboard
    0066-0066 : EC cmd
    0070-0077 : rtc0
    0080-008f : dma page reg
    00a0-00a1 : pic2
    00c0-00df : dma2
    00f0-00ff : fpu
    03c0-03df : vga+
    0400-047f : pnp 00:01
    0400-0403 : ACPI PM1a_EVT_BLK
    0404-0405 : ACPI PM1a_CNT_BLK
    0408-040b : ACPI PM_TMR
    0410-0415 : ACPI CPU throttle
    0420-042f : ACPI GPE0_BLK
    0430-0433 : iTCO_wdt
    0450-0450 : ACPI PM2_CNT_BLK
    0460-047f : iTCO_wdt
    0500-057f : pnp 00:01
    0600-060f : pnp 00:01
    0610-0610 : pnp 00:01
    0800-080f : pnp 00:01
    0810-0817 : pnp 00:01
    0820-0823 : pnp 00:01
    0cf8-0cff : PCI conf1
    0d00-ffff : PCI Bus 0000:00
    1000-2fff : PCI Bus 0000:05
    1000-107f : 0000:05:00.0
    1000-107f : atl1c
    3000-3fff : PCI Bus 0000:04
    4000-4fff : PCI Bus 0000:02
    5000-501f : 0000:00:1f.3
    5000-501f : i801_smbus
    5020-503f : 0000:00:1f.2
    5020-503f : ahci
    5040-505f : 0000:00:1d.2
    5040-505f : uhci_hcd
    5060-507f : 0000:00:1d.1
    5060-507f : uhci_hcd
    5080-509f : 0000:00:1d.0
    5080-509f : uhci_hcd
    50a0-50bf : 0000:00:1a.0
    50a0-50bf : uhci_hcd
    50c0-50c7 : 0000:00:1f.2
    50c0-50c7 : ahci
    50c8-50cf : 0000:00:1f.2
    50c8-50cf : ahci
    50d0-50d7 : 0000:00:02.0
    50d8-50db : 0000:00:1f.2
    50d8-50db : ahci
    50dc-50df : 0000:00:1f.2
    50dc-50df : ahci
    ff2c-ff2f : pnp 00:01


    I am new to all this kernel dev/mailing list stuff so I apologize in
    advance if I have done anything wrong by sending this.
    Thanks for the help,
    Chris.


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