Problem with s3c24xx pwm driver

Russell King - ARM Linux linux at arm.linux.org.uk
Thu Sep 24 16:34:37 EDT 2009


On Thu, Sep 24, 2009 at 05:33:24PM +0300, Vasily Khoruzhick wrote:
> Ok, I've found source of  problem: it seems to be some issue with backlight 
> LED driver (hardware, not software) with selected PWM clock. It seems that  
> part of period with "1" is not long enought to charge capacitor, or something 
> like this. PWM itself works fine.

Is it LED or is it CCFL?  If it's CCFL, it needs to be 'struck' and then
you can reduce the intensity level - by going to max brightness when you
turn it on and then back the intensity down.

That's fairly normal for CCFL stuff.



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