No longer able to turn lcd backlight off with 2.6.11->2.6.12-rc2

No longer able to turn lcd backlight off with 2.6.11->2.6.12-rc2

[klug]

After upgrading to 2.6.11.6 from 2.6.9 I am no longer able to turn the 
lcd backlight off with the command "echo lcd_out:0 > 
/proc/acpi/toshiba/video". I have since tried, 2.6.11, 2.6.11.7, 
2.6.12-rc1, and 2.6.12-rc2 with no luck. With that command I have been 
able to turn the lcd backlight off with all 2.6 kernels up to and 
including 2.6.9. Previous to the upgrade, nothing appeared in my kernel 
logs after giving the command, however, now with 2.6.11->2.6.12-rc2 I 
get the entry "[kernel] video bus notify". I have also tried the new 
option "CONFIG_BACKLIGHT_LCD_SUPPOT", but again that does not allow me 
to turn the backlight off. My complete setup including hardware/kernel 
options is avaiable at, http://bugme.osdl.org/show_bug.cgi?id=4468

-klug


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Re: No longer able to turn lcd backlight off with 2.6.11->2.6.12-rc2

[klug]

I tested 2.6.10, and had the same results as with 2.6.11->2.6.12-rc2. So 
it appears this is where the problem began.

klug wrote:

> After upgrading to 2.6.11.6 from 2.6.9 I am no longer able to turn the 
> lcd backlight off with the command "echo lcd_out:0 > 
> /proc/acpi/toshiba/video". I have since tried, 2.6.11, 2.6.11.7, 
> 2.6.12-rc1, and 2.6.12-rc2 with no luck. With that command I have been 
> able to turn the lcd backlight off with all 2.6 kernels up to and 
> including 2.6.9. Previous to the upgrade, nothing appeared in my 
> kernel logs after giving the command, however, now with 
> 2.6.11->2.6.12-rc2 I get the entry "[kernel] video bus notify". I have 
> also tried the new option "CONFIG_BACKLIGHT_LCD_SUPPOT", but again 
> that does not allow me to turn the backlight off. My complete setup 
> including hardware/kernel options is avaiable at, 
> http://bugme.osdl.org/show_bug.cgi?id=4468
>
> -klug
>


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