linux-kernel - Re: [PATCH 4.19 014/639] leds: tlc591xx: update the maximum brightness

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sun, 26 Jan 2020 10:18:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Pavel Machek <pavel@...x.de>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Jean-Jacques Hiblot <jjhiblot@...com>
Subject: Re: [PATCH 4.19 014/639] leds: tlc591xx: update the maximum
 brightness

On Sat, Jan 25, 2020 at 12:18:26AM +0100, Pavel Machek wrote:
> On Fri 2020-01-24 10:23:04, Greg Kroah-Hartman wrote:
> > From: Jean-Jacques Hiblot <jjhiblot@...com>
> > 
> > commit a2cafdfd8cf5ad8adda6c0ce44a59f46431edf02 upstream.
> > 
> > The TLC chips actually offer 257 levels:
> > - 0: led OFF
> > - 1-255: Led dimmed is using a PWM. The duty cycle range from 0.4% to 99.6%
> > - 256: led fully ON
> > 
> > Fixes: e370d010a5fe ("leds: tlc591xx: Driver for the TI 8/16 Channel i2c LED driver")
> > Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...com>
> > Signed-off-by: Pavel Machek <pavel@....cz>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> Its a new feature, really and quite unusual one: 257 brightness levels
> is not usual. It is theoretically safe, but...
> 
> Lets not do that for -stable.
> 
> (I'm a LED maintainer).

Ok, now dropped from 4.19 and older, thanks!

greg k-h