Bug#846882: wrong scale for backlight with Xfce

[Rpnpif <rpnpif@trob.eu>]

Le  6 décembre 2016, Andreas Boll a écrit :
> xserver-xorg-video-intel has some special backlight handling [2] so
> it's plausible that an updated package could cause regressions related
> to backlight.

> > [    13.881] 
> > X.Org X Server 1.16.4
> > Release Date: 2014-12-20
> > [    13.881] X Protocol Version 11, Revision 0
> > [    13.881] Build Operating System: Linux 3.2.0-4-amd64 i686 Debian
> > [    13.881] Current Operating System: Linux Asus-901 4.7.0-0.bpo.1-686-pae #1 SMP Debian 4.7.8-1~bpo8+1 (2016-10-19) i686
> > [    13.881] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.7.0-0.bpo.1-686-pae root=UUID=2ed3bc82-5cc0-4529-a13c-2e6f80b5b588 ro resume=/dev/sdb1 quiet  
> 
> snip
> 
> > [    14.063] (II) intel(0): Using Kernel Mode Setting driver: i915, version 1.6.0 20160425
> > [    14.063] (II) intel(0): SNA compiled: xserver-xorg-video-intel 2:2.99.917+git20161105-1~bpo8+1 (Vincent Cheng <vcheng@debian.org>)  
> 
> Reassigning to xserver-xorg-video-intel for now.
> 
> Thanks,
> Andreas
> 
> [1] http://snapshot.debian.org/package/xserver-xorg-video-intel/
> [2] https://cgit.freedesktop.org/xorg/driver/xf86-video-intel/log/?qt=grep&q=backlight

You are right!
The 2:2.99.917+git20160706-1~bpo8+1 release works fine but not
2:2.99.917+git20161105-1~bpo8+1.

So it is really a regression on the last release.
Perhaps a wrong choice of the best iface or about, or other thing.

My system have two backlight interfaces:
/sys/class/backlight/eeepc and /sys/class/backlight/intel_backlight

The first is safer but the second permits atomic variations of the
backlight.

Thank you.

-- 
Alain Rpnpif