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Thread: Backlight control not working in kubuntu 12.04

  1. #1
    Join Date
    Nov 2005
    Location
    Aveiro, Portugal
    Beans
    92
    Distro
    Kubuntu 12.04 Precise Pangolin

    Cool Backlight control not working in kubuntu 12.04

    Hi all.

    I have a Toshiba A300-202 laptop. With older installations of kubuntu I hadd full control over the backlight. After a clean instalation of kubuntu 12.04.1 the backlight control stopped working.
    The desktop responds to the brightness Fn-keys but there's no response from the display.

    Here's the output of lshw
    Code:
    WARNING: you should run this program as super-user.
    tinta-roriz               
        description: Computer
        width: 64 bits
        capabilities: vsyscall32
      *-core
           description: Motherboard
           physical id: 0
         *-memory
              description: System memory
              physical id: 0
              size: 3953MiB
         *-cpu
              product: Intel(R) Core(TM)2 Duo CPU     T9550  @ 2.66GHz
              vendor: Intel Corp.
              physical id: 1                                                                                                                                                                                       
              bus info: cpu@0                                                                                                                                                                                      
              size: 2667MHz
              capacity: 2667MHz
              width: 64 bits
              capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm ida dtherm tpr_shadow vnmi flexpriority cpufreq
         *-pci
              description: Host bridge
              product: Mobile 4 Series Chipset Memory Controller Hub
              vendor: Intel Corporation
              physical id: 100
              bus info: pci@0000:00:00.0
              version: 07
              width: 32 bits
              clock: 33MHz
            *-pci:0
                 description: PCI bridge
                 product: Mobile 4 Series Chipset PCI Express Graphics Port
                 vendor: Intel Corporation
                 physical id: 1
                 bus info: pci@0000:00:01.0
                 version: 07
                 width: 32 bits
                 clock: 33MHz
                 capabilities: pci normal_decode bus_master cap_list
                 configuration: driver=pcieport
                 resources: irq:40 ioport:5000(size=4096) memory:d6300000-d63fffff ioport:c0000000(size=268435456)
               *-display
                    description: VGA compatible controller
                    product: RV635 [Mobility Radeon HD 3650]
                    vendor: Hynix Semiconductor (Hyundai Electronics)
                    physical id: 0
                    bus info: pci@0000:01:00.0
                    version: 00
                    width: 32 bits
                    clock: 33MHz
                    capabilities: vga_controller bus_master cap_list rom
                    configuration: driver=radeon latency=0
                    resources: irq:46 memory:c0000000-cfffffff ioport:5000(size=256) memory:d6300000-d630ffff memory:d6320000-d633ffff
               *-multimedia
                    description: Audio device
                    product: RV635 HDMI Audio [Radeon HD 3600 Series]
                    vendor: Hynix Semiconductor (Hyundai Electronics)
                    physical id: 0.1
                    bus info: pci@0000:01:00.1
                    version: 00
                    width: 32 bits
                    clock: 33MHz
                    capabilities: bus_master cap_list
                    configuration: driver=snd_hda_intel latency=0
                    resources: irq:49 memory:d6310000-d6313fff
            *-usb:0
                 description: USB controller
                 product: 82801I (ICH9 Family) USB UHCI Controller #4
                 vendor: Intel Corporation
                 physical id: 1a
                 bus info: pci@0000:00:1a.0
                 version: 03
                 width: 32 bits
                 clock: 33MHz
                 capabilities: uhci bus_master cap_list
                 configuration: driver=uhci_hcd latency=0
                 resources: irq:16 ioport:60e0(size=32)
            *-usb:1
                 description: USB controller
                 product: 82801I (ICH9 Family) USB UHCI Controller #5
                 vendor: Intel Corporation
                 physical id: 1a.1
                 bus info: pci@0000:00:1a.1
                 version: 03
                 width: 32 bits
                 clock: 33MHz
                 capabilities: uhci bus_master cap_list
                 configuration: driver=uhci_hcd latency=0
                 resources: irq:21 ioport:60c0(size=32)
            *-usb:2
                 description: USB controller
                 product: 82801I (ICH9 Family) USB2 EHCI Controller #2
                 vendor: Intel Corporation
                 physical id: 1a.7
                 bus info: pci@0000:00:1a.7
                 version: 03
                 width: 32 bits
                 clock: 33MHz
                 capabilities: ehci bus_master cap_list
                 configuration: driver=ehci_hcd latency=0
                 resources: irq:19 memory:d6405c00-d6405fff
            *-multimedia
                 description: Audio device
                 product: 82801I (ICH9 Family) HD Audio Controller
                 vendor: Intel Corporation
                 physical id: 1b
                 bus info: pci@0000:00:1b.0
                 version: 03
                 width: 64 bits
                 clock: 33MHz
                 capabilities: bus_master cap_list
                 configuration: driver=snd_hda_intel latency=0
                 resources: irq:48 memory:d6400000-d6403fff
            *-pci:1
                 description: PCI bridge
                 product: 82801I (ICH9 Family) PCI Express Port 1
                 vendor: Intel Corporation
                 physical id: 1c
                 bus info: pci@0000:00:1c.0
                 version: 03
                 width: 32 bits
                 clock: 33MHz
                 capabilities: pci normal_decode bus_master cap_list
                 configuration: driver=pcieport
                 resources: irq:41 ioport:3000(size=8192) memory:d5300000-d62fffff ioport:d0000000(size=17825792)
               *-network
                    description: Ethernet interface
                    product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
                    vendor: Realtek Semiconductor Co., Ltd.
                    physical id: 0
                    bus info: pci@0000:02:00.0
                    logical name: eth0
                    version: 02
                    serial: 00:1e:33:90:eb:df
                    size: 100Mbit/s
                    capacity: 100Mbit/s
                    width: 64 bits
                    clock: 33MHz
                    capabilities: bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
                    configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=N/A ip=10.112.40.121 latency=0 multicast=yes port=MII speed=100Mbit/s
                    resources: irq:45 ioport:3000(size=256) memory:d0010000-d0010fff memory:d0000000-d000ffff
            *-pci:2
                 description: PCI bridge
                 product: 82801I (ICH9 Family) PCI Express Port 2
                 vendor: Intel Corporation
                 physical id: 1c.1
                 bus info: pci@0000:00:1c.1
                 version: 03
                 width: 32 bits
                 clock: 33MHz
                 capabilities: pci normal_decode bus_master cap_list
                 configuration: driver=pcieport
                 resources: irq:42 ioport:2000(size=4096) memory:d4200000-d52fffff ioport:d1100000(size=16777216)
               *-network
                    description: Wireless interface
                    product: WiFi Link 5100
                    vendor: Intel Corporation
                    physical id: 0
                    bus info: pci@0000:03:00.0
                    logical name: wlan0
                    version: 00
                    serial: 00:22:fa:18:fb:24
                    width: 64 bits
                    clock: 33MHz
                    capabilities: bus_master cap_list ethernet physical wireless
                    configuration: broadcast=yes driver=iwlwifi driverversion=3.2.0-38-generic firmware=8.83.5.1 build 33692 ip=172.22.1.154 latency=0 multicast=yes wireless=IEEE 802.11abgn
                    resources: irq:47 memory:d4200000-d4201fff
            *-pci:3
                 description: PCI bridge
                 product: 82801I (ICH9 Family) PCI Express Port 5
                 vendor: Intel Corporation
                 physical id: 1c.4
                 bus info: pci@0000:00:1c.4
                 version: 03
                 width: 32 bits
                 clock: 33MHz
                 capabilities: pci normal_decode bus_master cap_list
                 configuration: driver=pcieport
                 resources: irq:43 ioport:1000(size=4096) memory:d3200000-d41fffff ioport:d2100000(size=16777216)
            *-usb:3
                 description: USB controller
                 product: 82801I (ICH9 Family) USB UHCI Controller #1
                 vendor: Intel Corporation
                 physical id: 1d
                 bus info: pci@0000:00:1d.0
                 version: 03
                 width: 32 bits
                 clock: 33MHz
                 capabilities: uhci bus_master cap_list
                 configuration: driver=uhci_hcd latency=0
                 resources: irq:23 ioport:60a0(size=32)
            *-usb:4
                 description: USB controller
                 product: 82801I (ICH9 Family) USB UHCI Controller #2
                 vendor: Intel Corporation
                 physical id: 1d.1
                 bus info: pci@0000:00:1d.1
                 version: 03
                 width: 32 bits
                 clock: 33MHz
                 capabilities: uhci bus_master cap_list
                 configuration: driver=uhci_hcd latency=0
                 resources: irq:19 ioport:6080(size=32)
            *-usb:5
                 description: USB controller
                 product: 82801I (ICH9 Family) USB UHCI Controller #3
                 vendor: Intel Corporation
                 physical id: 1d.2
                 bus info: pci@0000:00:1d.2
                 version: 03
                 width: 32 bits
                 clock: 33MHz
                 capabilities: uhci bus_master cap_list
                 configuration: driver=uhci_hcd latency=0
                 resources: irq:16 ioport:6060(size=32)
            *-usb:6
                 description: USB controller
                 product: 82801I (ICH9 Family) USB UHCI Controller #6
                 vendor: Intel Corporation
                 physical id: 1d.3
                 bus info: pci@0000:00:1d.3
                 version: 03
                 width: 32 bits
                 clock: 33MHz
                 capabilities: uhci bus_master cap_list
                 configuration: driver=uhci_hcd latency=0
                 resources: irq:18 ioport:6040(size=32)
            *-usb:7
                 description: USB controller
                 product: 82801I (ICH9 Family) USB2 EHCI Controller #1
                 vendor: Intel Corporation
                 physical id: 1d.7
                 bus info: pci@0000:00:1d.7
                 version: 03
                 width: 32 bits
                 clock: 33MHz
                 capabilities: ehci bus_master cap_list
                 configuration: driver=ehci_hcd latency=0
                 resources: irq:23 memory:d6405800-d6405bff
            *-pci:4
                 description: PCI bridge
                 product: 82801 Mobile PCI Bridge
                 vendor: Intel Corporation
                 physical id: 1e
                 bus info: pci@0000:00:1e.0
                 version: 93
                 width: 32 bits
                 clock: 33MHz
                 capabilities: pci subtractive_decode bus_master cap_list
                 resources: memory:d3100000-d31fffff
               *-firewire
                    description: FireWire (IEEE 1394)
                    product: R5C832 IEEE 1394 Controller
                    vendor: Ricoh Co Ltd
                    physical id: 6
                    bus info: pci@0000:04:06.0
                    version: 05
                    width: 32 bits
                    clock: 33MHz
                    capabilities: ohci bus_master cap_list
                    configuration: driver=firewire_ohci latency=64 maxlatency=4 mingnt=2
                    resources: irq:17 memory:d3100000-d31007ff
               *-generic:0
                    description: SD Host controller
                    product: R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter
                    vendor: Ricoh Co Ltd
                    physical id: 6.1
                    bus info: pci@0000:04:06.1
                    version: 22
                    width: 32 bits
                    clock: 33MHz
                    capabilities: bus_master cap_list
                    configuration: driver=sdhci-pci latency=32
                    resources: irq:17 memory:d3100b00-d3100bff
               *-generic:1
                    description: System peripheral
                    product: R5C592 Memory Stick Bus Host Adapter
                    vendor: Ricoh Co Ltd
                    physical id: 6.2
                    bus info: pci@0000:04:06.2
                    version: 12
                    width: 32 bits
                    clock: 33MHz
                    capabilities: bus_master cap_list
                    configuration: driver=r592 latency=64
                    resources: irq:17 memory:d3100900-d31009ff
               *-generic:2
                    description: System peripheral
                    product: xD-Picture Card Controller
                    vendor: Ricoh Co Ltd
                    physical id: 6.3
                    bus info: pci@0000:04:06.3
                    version: 12
                    width: 32 bits
                    clock: 33MHz
                    capabilities: bus_master cap_list
                    configuration: driver=r852 latency=64
                    resources: irq:17 memory:d3100800-d31008ff
            *-isa
                 description: ISA bridge
                 product: ICH9M LPC Interface Controller
                 vendor: Intel Corporation
                 physical id: 1f
                 bus info: pci@0000:00:1f.0
                 version: 03
                 width: 32 bits
                 clock: 33MHz
                 capabilities: isa bus_master cap_list
                 configuration: latency=0
            *-storage
                 description: SATA controller
                 product: 82801IBM/IEM (ICH9M/ICH9M-E) 4 port SATA Controller [AHCI mode]
                 vendor: Intel Corporation
                 physical id: 1f.2
                 bus info: pci@0000:00:1f.2
                 version: 03
                 width: 32 bits
                 clock: 66MHz
                 capabilities: storage ahci_1.0 bus_master cap_list
                 configuration: driver=ahci latency=0
                 resources: irq:44 ioport:6108(size=8) ioport:6114(size=4) ioport:6100(size=8) ioport:6110(size=4) ioport:6020(size=32) memory:d6405000-d64057ff
            *-serial UNCLAIMED
                 description: SMBus
                 product: 82801I (ICH9 Family) SMBus Controller
                 vendor: Intel Corporation
                 physical id: 1f.3
                 bus info: pci@0000:00:1f.3
                 version: 03
                 width: 64 bits
                 clock: 33MHz
                 configuration: latency=0
                 resources: memory:d6406000-d64060ff ioport:6000(size=32)
    WARNING: output may be incomplete or inaccurate, you should run this program as super-user.
    Unfortunately, display brightness is permanently set to the maximum, which is extremelly uncomfortable.
    Does anyone has a hint on how to fix this up?
    Thanks!
    Last edited by tomane; March 19th, 2013 at 04:52 PM.

  2. #2
    Join Date
    Jul 2010
    Location
    ozarks, Arkansas, USA
    Beans
    6,541
    Distro
    Lubuntu 14.04 Trusty Tahr

    Re: Backlight control not working in kubuntu 12.04

    tomane; Hi !

    This solution is directed to the Acer products, but may prove of value in your situation. Worth a try.
    The boot parameters :"acpi_osi=Linux acpi_backlight=vendor".
    Try these in grub's booting. If it works in that instance then commit the changes in /etc/default/grub config file.

    hope this helps

  3. #3
    Join Date
    Nov 2005
    Location
    Aveiro, Portugal
    Beans
    92
    Distro
    Kubuntu 12.04 Precise Pangolin

    Re: Backlight control not working in kubuntu 12.04

    ( weird-o, some post just got removed, but its contents weren't all that useful either... 0.o)

    Bashing-om, thanks for your hint. I think I already tried some boot param trick before but I'm pretty sure that is was different from your suggestion. I'll give it a try and see how it goes.

    Cheers,

  4. #4
    Join Date
    Nov 2005
    Location
    Aveiro, Portugal
    Beans
    92
    Distro
    Kubuntu 12.04 Precise Pangolin

    Re: Backlight control not working in kubuntu 12.04

    I just checked and actually I already had tried the acpi_backlight=vendor portion.

    Adding the acpi_osi=Linux caused the Fn-keys not to be recognized anymore. However, trying to change backlight intensity using the GUI (using the mouse and system settings) still yelded no effect.

    Then, just for kicks, I decided to try acpi_osi=Windows. Fn-keys are recognized (including BL control), but there's no change in actual display brightness.

    Either the backlight is not controlled by ACPI (maybe the GFX card is in charge of this??) or somehow the desktop reacts to keys but doesn't notify the bios/acpi/whatever about the command.

    Does anyone know some trick for laptops using Radeon cards or Toshiba laptops?

    Thanks...

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