Kernel panic when kldunload acpi_video

Norberto Meijome freebsd at
Tue Jan 15 19:36:44 PST 2008

On Wed, 16 Jan 2008 14:04:39 +1100 (EST)
Ian Smith <smithi at> wrote:

> Beto, hi,
> not to detract from the seriousness of the problem,

Hey Ian,

> two dumb questions: 
> 1) why would you need to unload it?  

no reason at all really - other than I wanted to see if it made any difference and I stumbled upon it...or rather the whole system stumbled and crashed...

> ie did loading it fix the problem?

nope - it doesn't seem to be related to the ACPI brightness control.

> 2) does this mean the acpi_ibm brightness controls aren't working in X?

means exactly that, for me. ACPI msgs are triggered  - the tpb util brings up the meter on the screen, but nothing actually changes. I need to double check with DRI disabled, but I think it wasnt working either. Tpb has never actually changed the meter of brightness, as it does with Volume - it has always been stuck in 0 ... never bothered to chase that down because the brightness changes happened anyway.

It does work fine on text mode.

PS : finally hit 31+ in Syd... i will need a separate AC unit to cool down the 'breathing' of the servers on my desk :P Luckily i'm not in Melb ;)... 
{Beto|Norberto|Numard} Meijome

"Unix is very simple, but it takes a genius to understand the simplicity."
   Dennis Ritchie

I speak for myself, not my employer. Contents may be hot. Slippery when wet. Reading disclaimers makes you go blind. Writing them is worse. You have been Warned.

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