[Bug 417610] Re: [i965GM] Display brightness completely dimmed after waking up from suspend

[Philippe Lanceleur]

Hi Volker,
I tried different manner but none of them reproduce your behaviour. 
Thanks for the tips and tricks anyway :)
I didn't give up with my tests as I really like this little Amilo 
machine and use it everyday to code web site. So I ended up with a Lenny 
Debian 5 installation to go back to the roots and see what happen. Good 
news:  as you may guess, all is working perfectly !
I hope this feedback will help to diff somewhere the differences between 
Debian Lenny and Jaunty. My kernel is 2.6.26-2.
Or, if someone can tell me where to look at I will be more than happy to 
help.
Philippe

Volker Knollmann a écrit :
> Hmmm... weird... I just found out that correct display brightness is
> restored on resume if the laptop is NOT CONNECTED to the AC power. So
> the problem does not occur when resuming on battery power.
>
> @Philippe:
> Can you confirm this behaviour with our own system?
>
> I have no idea about the detailed technical background, so I'm just guessing:
> Is there some kind of trigger/event/interrupt from ACPI missing/ignored when resuming on AC power? Some trigger like "Hey, adjust your display brightness!!".
> During normal operation such an event seems to be fired when disconnecting AC power, since the display is slightly dimmed. Maybe it's exactly this function "detect transition from AC to battery ==> set brightness" that runs at the very moment the laptop wakes up with AC power disconnected. That would explain why the brightness is restored in that special case.
>
>
> This is just my own theory... since I'm not burdened with any technical expertise chances are high that it's complete bullsh*t... ;-)
>
> Best regards,
> Volker
>
>   

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*Philippe Lanceleur*
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[i965GM] Display brightness completely dimmed after waking up from suspend
https://bugs.launchpad.net/bugs/417610
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