Summary: Inverted brightness control on Packard Bell EasyNote
LV (black screen of death)
CC: daniel@..., jani.nikula@...
The laptop model Packard Bell EasyNote LV suffer from the "black screen of
on Linux with both Ubuntu Raring and Debian Wheezy.
One fix is to boot with i915.invert_brightness=1, as this stop the drm
from turning off the screen. Another fix is to boot with
which disable the acpi backlight interface and yield to the intel_backligh
interface that do not invert the brightness setting.
When booting with i915.invert_brightness=1, the KDE subsystem powerdevil turn
the screen when the user log in, while with acpi_backlight=vendor the KDE
subsystem do not. Because of this, I suspect the best fix is to either invert
the acpi backlight handling, or to disable acpi backlight handling completely.
I initially suggested to patch the i915 module in thread
<URL: http://lists.freedesktop.org/archives/dri-devel/2013-June/039763.html >,
but was asked to instead submit a bug report here to get the machine in
blacklisted from the acpi system.
I've gathered some notes about the model in question on
<URL: http://www.linlap.com/packard_bell_easynote_lv >.
Please fix the linux kernel to get backlight on this machine working out of the
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