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[Bug 1175605] Re: Monitor Dim to black workaround breaks Power management settings in Kubuntu and Ubuntu 13.04

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Fri, 05 Dec 2014 20:46:01 -0000
Reply-to: Bug 1175605 <1175605@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

catseye2500, this bug report is being closed due to your last comment
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1175605/comments/3
regarding this being fixed with an update. For future reference you can
manage the status of your own bugs by clicking on the current status in
the yellow line and then choosing a new status in the revealed drop down
box. You can learn more about bug statuses at
https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time
to report this bug and helping to make Ubuntu better. Please submit any
future bugs you may find.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1175605

Title:
  Monitor Dim to black workaround breaks Power management settings in
  Kubuntu and Ubuntu 13.04

Status in linux package in Ubuntu:
  Invalid

Bug description:
  System: Acer Aspire V3-771G-9456

  Intel I7 Core-3632QM 2.2GHZ
  6 gig memory 
  120GB OGZ Solid State Drive
  Nvidia Optimus-Geforce GT 640M with 2GB dedicated video memory

  Kubuntu 12.10
  Kernel 3.5.0-28
  KDE 4.10.2

  Kubuntu 13.04
  Kernel 3.8.0-18
  KDE 4.10.2

  During boot up of live CD and after installation of both Kubuntu 12.10
  and 13.04 my screen dims to black. I had to manually using the
  keyboard adjust the brightness for my screen to see. I found a
  solution to this by adding the following to my grub menu:

  "acpi_backlight=vendor" so it looks like this in the menu:

  GRUB_DEFAULT=0
  GRUB_HIDDEN_TIMEOUT=0
  GRUB_HIDDEN_TIMEOUT_QUIET=true
  GRUB_TIMEOUT=0
  GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
  GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
   
  On both versions this allows me to boot up and the screen does not dim to black. 

  The issue is for some reason, in Kubuntu 13.04 it breaks KDE power
  management settings so I can not dim the screen, suspend, or adjust
  the brightness of the monitor. When I take the acpi_backlight=vendor
  out of the grub menu the power management settings work fine in
  Kubuntu 13.04. I just have to manually adjust the brightness to login.

  The odd thing is the above configurations works flawlessly in Kubuntu
  12.10. I have the “acpi_backlight=vendor” in my grub menu and the
  power management setting work just fine.

  BTW: I also did a fresh Install of Ubuntu 13.04 and it did the same as
  Kubuntu 13.04.

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