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    SubjectCONFIG_ACPI_VIDEO on Thinkpad blanks display.
    On Wed, Sep 24, 2008 at 11:02:44PM -0700, carbonated beverage wrote:
    > I just upgraded from to on my Thinkpad Z61t, and found
    > the brightness keys will cause the X server to die. When using the
    > brightness up/down keys, the screen will go blank -- Control+Alt+F# will
    > still switch to a different virtual console, but switching back will not
    > restore the video state.

    (Subject changed to match the observed cause)

    Figured out what the change was -- in 2.6.25.x, the brightness keys worked
    without setting CONFIG_ACPI_VIDEO. However, in 2.6.26.x, the brightness keys
    do not work on the console without that enabled.

    If 2.6.25.x has that config option enabled, I still get the same blank screen
    symptoms -- with the following in the X logs:

    (II) PM Event received: Capability Changed
    I830PMEvent: Capability change
    (II) I810(0): Next ACPI _DGS [0] 0x80000100
    (II) I810(0): ACPI Toggle devices 0x1
    (II) I810(0): ACPI Toggle to 0x1
    (II) I810(0): Hotkey switch to 0x800.
    (II) I810(0): Attachable device 0x80000100.
    (II) I810(0): Attachable device 0x80000240.
    (II) I810(0): Attachable device 0x80000410.
    (II) I810(0): Requested display devices 0x800.
    (II) I810(0): Toggle (1) 0x1
    (II) I810(0): Detected duplicate devices. Toggling (0x1)
    (II) I810(0): Detected display change operation (0x0, 0x800, 0x1).
    (II) I810(0): Clearing Clone mode
    (II) I810(0): Primary pipe is now A.
    (--) I810(0): A non-CRT device is attached to pipe A.
    No refresh rate overrides will be attempted.
    (II) I810(0): Display plane A is enabled and connected to Pipe A.
    (II) I810(0): Display plane B is disabled and connected to Pipe B.
    (II) I810(0): Enabling plane A.
    (II) I810(0): Display plane A is now enabled and connected to Pipe A.
    (II) I810(0): Display plane B is now disabled and connected to Pipe B.
    (II) I810(0): PIPEACONF is 0x80000000
    (II) I810(0): PIPEBCONF is 0x00000000
    (II) I810(0): Mode bandwidth is 58 Mpixel/s
    (II) I810(0): maxBandwidth is 1152 Mbyte/s, pipe bandwidths are 48 Mbyte/s, 0 Mb
    (WW) I810(0): Changing XVideo pipe (1 to 0).

    Without CONFIG_ACPI_VIDEO, the above message don't appear. From this point,
    any pointers on figuring out why the ACPI features makes the screen go blank?

    -- DN

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