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
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** 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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