On Fri, 15 Feb 2008 04:51:15 -0800 (PST)
[EMAIL PROTECTED] wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=9995
> 
>            Summary: 2.6.25-rc1 regression - IBM ACPI backlight controlls do
>                     not work
>            Product: ACPI
>            Version: 2.5
>      KernelVersion: 2.6.25-rc1
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: BIOS
>         AssignedTo: [EMAIL PROTECTED]
>         ReportedBy: [EMAIL PROTECTED]
> 
> 
> Latest working kernel version: 2.6.24
> Earliest failing kernel version: 2.6.25-rc1
> Distribution: Ubuntu/Hardy
> Hardware Environment: ThinkPad T61
> Software Environment: n/a
> Problem Description: /sys/class/backlight/acpi_video0 does not control
> backlight, nothing happens if I change brightness.
> 
> Steps to reproduce: echo {15,5,0} > 
> /sys/class/backlight/acpi_video0/brightness 
> nothing happens.
> 

I've lost the plot on what's happening with backlight.  I think you're
about to find that this is not-a-bug, even though it stopped working.

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