Re: backlight mystery

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On 3/6/07, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
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.

I have a question: why can't we get at the DMI stuff from userspace
since "dmidecode" is a tool in userspace?

Thanks,
Forrest
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