Re: Minor Backlight Regression in 3.10.7

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On Thu, Aug 15, 2013 at 01:50:49PM +0200, Jochen Striepe wrote:
> 	Hello again,
> 
> Cc'ing Greg since this happens at -stable ... this happens on my
> Asus Eee PC Netbook.

Please cc: stable@xxxxxxxxxxxxxxx for stable questions/issues.

> On Tue, Aug 13, 2013 at 12:37:50PM +0200, Jochen Striepe wrote:
> > > Yes, stable 3.10.5 works fine, too. I guess I will test 3.11 a little
> > > bit later in the release cycle, maybe -rc5 as soon as Linus announces.
> > 
> > Backlight control on 3.11-rc5 works just as fine. Great! :)
> 
> Just tested 3.10.7, and seeing a minor regression: I use the Fn +
> Brighter/ Darker keys to set the backlight brightness, usually on
> tty12 where there is no shell at my system, just the syslog happily
> scrolling by.
> 
> Up to 3.10.5 and in 3.11-rc5 everything was fine, but with 3.10.7
> I get a ^@ at the tty every time I hit either the Darker or the Brighter
> key combination, just before the log message containing the brightness
> change. (Please tell if something's not clear, English is not my native
> language.) I guess this is not intended behaviour?
> 
> BTW, could that be related to the kernel warning I reported at LKML
> in Message-ID <20130813103202.GB2338@xxxxxxxxxxxxxxxxxxxxxxxx>
> (although I think that one has just to do with scsi timer/irqs)?
> The other idea coming to my mind is it could have to do with me
> upgrading glibc to 2.17 (Debian testing). Just guessing wildly.
> 
> Please tell me if you need more information.

Can you run 'git bisect' to track this down to the specific patch in the
3.10-stable releases?

thanks,

greg k-h
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