https://bugzilla.kernel.org/show_bug.cgi?id=60221
Summary: Inverted brightness control on Packard Bell EasyNote
LV (black screen of death)
Product: ACPI
Version: 2.5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: acpi_power-vi...@kernel-bugs.osdl.org
ReportedBy: p...@hungry.com
CC: dan...@ffwll.ch, jani.nik...@intel.com
Regression: No
The laptop model Packard Bell EasyNote LV suffer from the "black screen of
death"
on Linux with both Ubuntu Raring and Debian Wheezy.
One fix is to boot with i915.invert_brightness=1, as this stop the drm
subsystem
from turning off the screen. Another fix is to boot with
acpi_backlight=vendor,
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
off
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
question
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
box. :)
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