[Bug 12637] Re: LCD Brightness on Laptop Always Set Very Low at Boot

hunterthomson darden.tyler at gmail.com
Mon Jan 5 05:38:46 UTC 2009

Hello, I posted before when Ubuntu switched to 8.04. The brightness was
dim on boot/media player start/Game and not as bright. .I then switch to
Archlinux but the problem cotinued but was not as bad, i.e. only dim
once then not the next time you start vlc or game. Then came Ubuntu 8.10
and the problem became strange. Dim on boot and screen saver Only. And
the brightness controls started going bright-> dim->  then bright again
instead of dim->bright. I fooled around fixing the errors in the DSDT
but could not fix the problem. This do to the lack of documentation on
ACPI and AML. Then came chrismulderza on the ubuntuforums.org. He found
out that the DSDT in the Lenovo Idea Pad Y510 was not giving the info to
the kernel in the order it needed it and spesified in the ACPI
standerds. In fact it was just spiting the info about the audio to the
kernel and not ordering it at all. So, he fixed it and now the
brightness is fixed.


Just to make it clear.

This is all the deliberate act of Microsoft to make all computers only
run on windows. They were taken to the supreme court of the United
States of America and Found Guilty.

ACPI standers were made by a group of compays. Intel and Microsoft were
among them. In the end intel made a compiler and Microsoft made one.
Microsoft one is not standers compliant and Microsoft makes windows be
able to run on messed up DSDT's and such that come out of there
compiler. So, when computer manufacturers are writing the DSDT's and
such they use the Micosoft compyler. Why maybe they are installing
windows on most of the computers so they don't care. OR they just don't
relies that the Microsoft complier sucks. At the end of the day windows
only computers are pumped into the market.

LCD Brightness on Laptop Always Set Very Low at Boot
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