Re: backlight mystery

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On Tue, 6 Mar 2007 02:43:12 -0500 Dave Jones <davej@xxxxxxxxxx> wrote:

> On Mon, Mar 05, 2007 at 11:30:37PM -0800, Andrew Morton wrote:
>  > 
>  > I always get stuff like this coming out when I boot my x86_64 machine:
>  > 
>  > asus_acpi: Unknown symbol backlight_device_unregister
>  > asus_acpi: Unknown symbol backlight_device_register
>  > ibm_acpi: Unknown symbol backlight_device_unregister
>  > ibm_acpi: Unknown symbol backlight_device_register
>  > toshiba_acpi: Unknown symbol backlight_device_unregister
>  > toshiba_acpi: Unknown symbol backlight_device_register
>  > video: Unknown symbol backlight_device_unregister
>  > video: Unknown symbol backlight_device_register
>  > 
>  > This is a nocoma server, not a laptop.  I'm not sure how those modules are
>  > even getting loaded.  The distro is FC4, which might be doing something
>  > peculiar.  
> 
> I covered this on the list last week.  There's no way to
> have a module autoload based on dmi strings or the like,
> (Which is the only sane way these modules can determine
>  if they need to run).
> 
> Given the absense of mechanism, there's a pretty gross hack
> in Fedora's rc.sysinit which loads every module in drivers/acpi/*/*
> that it finds.  Shameful I know.
> 
> 	Dave

I thought it might be something like that.  I'm a bit surprised that we
can't get at the DMI stuff from userspace, or export it from the kernel. 
But whatever.

Something appears to have gone wrong with the dependencies though - the
load of the acpi drivers should have triggered a load of the backlight
driver.

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