[Pkg-acpi-devel] Bug#558645: acpi: screen brightness keyboard glitch on a Dell laptop

Vladimir Komendantsky komendantsky at gmail.com
Sun Nov 29 16:27:06 UTC 2009

Package: acpi
Version: 1.4-2
Severity: important

I have a Dell Inspiron laptop. The backlight brightness keyboard
command, Fn-Up/Down, makes the screen to flicker either in X or in the
text mode. This glitch has appeared recently after an update.

If the keys are pressed in Gnome, the screen brightness popup window
stays on for a long time showing the brightness value to change a few
times in a second, and eventually ends up reaching the value 0.

The Gnome LCD brightness applet is unaffected as well as the direct
parameter setting, e.g.,
"echo 1 > /sys/class/backlight/acpi_video0/brightness"
Only the keyboard commands are affected by the glitch.


-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.30.lowlatency.3 (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages acpi depends on:
ii  libc6                         2.10.1-7   GNU C Library: Shared libraries

acpi recommends no packages.

acpi suggests no packages.

-- no debconf information

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