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Bug#728671: general: Screen backlight "Pulses" when being lowered and is inconsistent (Debian Testing)

Package: general
Severity: normal


I'm currently running the latest version of Debian Testing (as of 4/11/2013
02:00 GMT+2), and I've noticed a problem while changing the backlight of my

When I press the "Lower Brightness" key combination (FN+Home on my Lenovo
SL500) and keep it pressed, the backlight keeps pulsing on the lowest setting,
like it's trying to go one step lower but it can't. This keeps happening as
long as the key-combo is pressed.

I've noticed that the stepping for the brightness level is kind of unstable as
there's also a small pulse-like effect going on when I change brightness in
general. It gradually becomes more evident as I get close to the lowest
brightness setting.

The amount of steps is inconsistent, as it requires 14 steps to go from
brightest to lowest and only 5 to go from lowest to brightest. Also, the OSD
freezes when keeping the key combination pressed, instead of gradually changing
to the highest or lowest setting. After a while (a few seconds), it unfreezes
and shows the correct value. It also appears that you can't do anything while
the OSD is frozen.

The same problem also occurs when using Ubuntu 13.10 (tried that about a week
ago... so many crashes), on the same laptop. This problem did not occur in
Wheezy or Ubuntu 13.04.

I'm not really sure but I think that this problem has appeared in Testing
today, after installing the latest updates:
[UPGRADE] gnome-icon-theme:amd64 3.8.3-1 -> 3.10.0-1
[UPGRADE] gnome-icon-theme-extras:amd64 3.6.2-2 -> 3.6.2-3
[UPGRADE] gnome-icon-theme-symbolic:amd64 -> 3.10.1-1
[UPGRADE] gnome-terminal:amd64 3.8.4-1 -> 3.10.1-1
[UPGRADE] gnome-terminal-data:amd64 3.8.4-1 -> 3.10.1-1
[UPGRADE] libtxc-dxtn-s2tc0:amd64 0~git20121227-1 -> 0~git20121227-2
[UPGRADE] libtxc-dxtn-s2tc0:i386 0~git20121227-1 -> 0~git20121227-2
[UPGRADE] libxml-libxml-perl:amd64 2.0010+dfsg-1+b1 -> 2.0106+dfsg-1
[UPGRADE] python-apt:amd64 -> 0.9.1
[UPGRADE] python-apt-common:amd64 -> 0.9.1
[UPGRADE] python3-apt:amd64 -> 0.9.1

I also installed (and configured) the lm_sensors and hddtemp packages.

I'm using gnome-shell. I don't know whether a gnome-shell extension is causing
this. I've disabled any newly installed extensions but it hasn't done anything.

Thank you,

-- System Information:
Debian Release: jessie/sid
  APT prefers testing-updates
  APT policy: (500, 'testing-updates'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.10-3-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

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