Fixed with kernel boot option "acpi_osi=" (without quotation marks).
** Changed in: acpi-support (Ubuntu)
Status: New => Fix Released
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LCD backlight brightness control only works until boot starts
https://bugs.launchpad.net/bugs/279163
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"Good news, everyone..."
Playing with the options explained here
http://www.columbia.edu/~ariel/acpi/acpi_howto.txt I finally managed to
get it done.
I added the boot option acpi_osi= to my kernel line in
/boot/grub/menu.lst and now it works. By default acpi_osi is used to
hand over a string to t
I'm now on Arch and with a very simple installation the error is the
same. As soon as acpid is loaded the brightness cannot be changed
anymore.
cat /proc/acpi/video/IGD/LCD/info
yields following output
device_id: 0x0110
type: UNKNOWN
known by bios: no
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LCD backlight brightness control only w
Is there any more information I shall provide? How can I try debugging
it on my own?
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LCD backlight brightness control only works until boot starts
https://bugs.launchpad.net/bugs/279163
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
This is the related thread with information what fixes I tried:
http://ubuntuforums.org/showthread.php?p=5915703
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LCD backlight brightness control only works until boot starts
https://bugs.launchpad.net/bugs/279163
You received this bug notification because you are a member of Ubuntu
Bugs, whi
** Attachment added: "output of sudo dmidecode"
http://launchpadlibrarian.net/18266165/output_of_sudo_dmidecode
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LCD backlight brightness control only works until boot starts
https://bugs.launchpad.net/bugs/279163
You received this bug notification because you are a member of Ubuntu
Bugs, w
** Attachment added: "output of sudo lspci -vvnn"
http://launchpadlibrarian.net/18266129/output_of_sudo_lspci_-vvnn
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LCD backlight brightness control only works until boot starts
https://bugs.launchpad.net/bugs/279163
You received this bug notification because you are a member of Ubuntu
Bug
This happened when trying to copy the acpi directory to tmp:
cp: cannot open `/proc/acpi/event' for reading: Device or resource busy
Hope it doesn't make a difference.
** Attachment added: "output of uname -a"
http://launchpadlibrarian.net/18266104/output_of_uname_-a
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LCD backlight bright
** Attachment added: "tarball of /proc/acpi"
http://launchpadlibrarian.net/18266084/acpi.tar.bz
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LCD backlight brightness control only works until boot starts
https://bugs.launchpad.net/bugs/279163
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscrib
