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    SubjectRe: [Linux-fbdev-devel] 2.6.21-rc2 radeon backlight
    > > > yes, if i disable the radeon backlight and use the ibm acpi module,
    > > > than the backlight works. if i enable the radeon backlight, the screen
    > > > stays dark and i can't turn it on (i tried using radeontool to control
    > > > it but nothing happened).
    > >
    > > Richard, is this actually a bug, or is it a config error or something like that?
    > >
    > > And should we track it as a post-2.6.20 regression?
    >
    > Why don't we compromise for 2.6.21 by marking the Radeon backlight
    > stuff EXPERIMENTAL until the cases where IBM ACPI works and the
    > Radeon backlight stuff does not are worked out?

    How about this?

    diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
    index b8f0a11..eb54d1f 100644
    --- a/drivers/video/Kconfig
    +++ b/drivers/video/Kconfig
    @@ -679,7 +679,6 @@ config FB_NVIDIA
    depends on FB && PCI
    select I2C_ALGOBIT if FB_NVIDIA_I2C
    select I2C if FB_NVIDIA_I2C
    - select FB_BACKLIGHT if FB_NVIDIA_BACKLIGHT
    select FB_MODE_HELPERS
    select FB_CFB_FILLRECT
    select FB_CFB_COPYAREA
    @@ -708,7 +707,8 @@ config FB_NVIDIA_I2C

    config FB_NVIDIA_BACKLIGHT
    bool "Support for backlight control"
    - depends on FB_NVIDIA
    + depends on FB_NVIDIA && EXPERIMENTAL
    + select FB_BACKLIGHT
    default y
    help
    Say Y here if you want to control the backlight of your display.
    @@ -717,7 +717,6 @@ config FB_RIVA
    tristate "nVidia Riva support"
    depends on FB && PCI
    select FB_DDC if FB_RIVA_I2C
    - select FB_BACKLIGHT if FB_RIVA_BACKLIGHT
    select FB_MODE_HELPERS
    select FB_CFB_FILLRECT
    select FB_CFB_COPYAREA
    @@ -754,7 +753,8 @@ config FB_RIVA_DEBUG

    config FB_RIVA_BACKLIGHT
    bool "Support for backlight control"
    - depends on FB_RIVA
    + depends on FB_RIVA && EXPERIMENTAL
    + select FB_BACKLIGHT
    default y
    help
    Say Y here if you want to control the backlight of your display.
    @@ -994,7 +994,6 @@ config FB_RADEON
    tristate "ATI Radeon display support"
    depends on FB && PCI
    select FB_DDC if FB_RADEON_I2C
    - select FB_BACKLIGHT if FB_RADEON_BACKLIGHT
    select FB_MODE_HELPERS
    select FB_CFB_FILLRECT
    select FB_CFB_COPYAREA
    @@ -1024,7 +1023,8 @@ config FB_RADEON_I2C

    config FB_RADEON_BACKLIGHT
    bool "Support for backlight control"
    - depends on FB_RADEON
    + depends on FB_RADEON && EXPERIMENTAL
    + select FB_BACKLIGHT
    default y
    help
    Say Y here if you want to control the backlight of your display.
    @@ -1044,7 +1044,6 @@ config FB_ATY128
    select FB_CFB_FILLRECT
    select FB_CFB_COPYAREA
    select FB_CFB_IMAGEBLIT
    - select FB_BACKLIGHT if FB_ATY128_BACKLIGHT
    select FB_MACMODES if PPC_PMAC
    help
    This driver supports graphics boards with the ATI Rage128 chips.
    @@ -1056,7 +1055,8 @@ config FB_ATY128

    config FB_ATY128_BACKLIGHT
    bool "Support for backlight control"
    - depends on FB_ATY128
    + depends on FB_ATY128 && EXPERIMENTAL
    + select FB_BACKLIGHT
    default y
    help
    Say Y here if you want to control the backlight of your display.
    @@ -1067,7 +1067,6 @@ config FB_ATY
    select FB_CFB_FILLRECT
    select FB_CFB_COPYAREA
    select FB_CFB_IMAGEBLIT
    - select FB_BACKLIGHT if FB_ATY_BACKLIGHT
    select FB_MACMODES if PPC
    help
    This driver supports graphics boards with the ATI Mach64 chips.
    @@ -1106,7 +1105,8 @@ config FB_ATY_GX

    config FB_ATY_BACKLIGHT
    bool "Support for backlight control"
    - depends on FB_ATY
    + depends on FB_ATY && EXPERIMENTAL
    + select FB_BACKLIGHT
    default y
    help
    Say Y here if you want to control the backlight of your display.
    -
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