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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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