Bug report - Lenovo T440s

Jol Valentine <jolv@xxxxxxxxx> · Thu, 19 Feb 2015 15:20:53 +1100



    Hi folks,

    
    I have a bug report for a Lenovo T440s. I know the "unsupported
    brightness interface" has been reported numerous times, but from an
    end user perspective I have two issues:

    
      once I 'logon' to the Linux desktop and the X display starts
        (i.e. after the gnome logon screen) the brightness is set such
        that the display is blank, and I have to use the brightness keys
        (i.e in the T440s case F8) to increase the brightness to I can
        see the desktop.
      If I have a second monitor plugged in the display stays blank
        and I can't even see the gnome logon display screen at all.
    
    
    Feb 19 14:23:25
        Bosendorfer kernel: [    7.543808] thinkpad_acpi: ThinkPad ACPI
        Extras v0.25

        Feb 19 14:23:25 Bosendorfer kernel: [    7.543810]
        thinkpad_acpi: http://ibm-acpi.sf.net/

        Feb 19 14:23:25 Bosendorfer kernel: [    7.543811]
        thinkpad_acpi: ThinkPad BIOS GJET77WW (2.27 ), EC unknown

        Feb 19 14:23:25 Bosendorfer kernel: [    7.543813]
        thinkpad_acpi: Lenovo ThinkPad T440s, model 20AQCTO1WW

        Feb 19 14:23:25 Bosendorfer kernel: [    7.544300]
        thinkpad_acpi: Unsupported brightness interface, please contact
        ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx

        Feb 19 14:23:25 Bosendorfer kernel: [    7.544371]
        thinkpad_acpi: radio switch found; radios are enabled

        Feb 19 14:23:25 Bosendorfer kernel: [    7.544430]
        thinkpad_acpi: This ThinkPad has standard ACPI backlight
        brightness control, supported by the ACPI video driver

        Feb 19 14:23:25 Bosendorfer kernel: [    7.544431]
        thinkpad_acpi: Disabling thinkpad-acpi brightness events by
        default...

        Feb 19 14:23:25 Bosendorfer kernel: [    7.545366]
        thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is
        unblocked

        Feb 19 14:23:25 Bosendorfer kernel: [    7.545690]
        thinkpad_acpi: Console audio control enabled, mode: monitor
        (read only)

        Feb 19 14:23:25 Bosendorfer kernel: [    7.546796] input:
        ThinkPad Extra Buttons as
        /devices/platform/thinkpad_acpi/input/input9

      
    I am running Debian Jessie (testing) 

    
    Linux Bosendorfer
      3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt4-3 (2015-02-03) x86_64
      GNU/Linux

      
      /proc/acpi/ibm/driver 

      driver:        ThinkPad ACPI Extras

      version:    0.25

      
    Hope this is the correct place to report this,

    
    In response to some of the reports the replies are that "Unsupported
    brightness interface, " is a normal message and can be ignored, 

    and unlike some others who have reported, my F5,F6 keys to adjust
    the brightness do work (although I think they were running
    experimental),

    
    so I'm at a bit of a loss as to what I can do to fix this, the
    second display 'startup' issue is the real nuisance - I have to
    remember to unplug the display when (re)booting.

    
    regards,

    Jol.

    
------------------------------------------------------------------------------
Dive into the World of Parallel Programming The Go Parallel Website, sponsored
by Intel and developed in partnership with Slashdot Media, is your hub for all
things parallel software development, from weekly thought leadership blogs to
news, videos, case studies, tutorials and more. Take a look and join the 
conversation now. http://goparallel.sourceforge.net/
_______________________________________________
ibm-acpi-devel mailing list
ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/ibm-acpi-devel