This happened to me as well, and I'm on
14.04 Trusty Gnome
It happened to me because I deleted the default key ring which then
brought other failures
Not sure if thats a bug or not, but it might be a good idea to have the
default key default to nothing if it isn't specified
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Have the same problem with my msi ge 600 laptop. Driver issue likely
because I can adjast brightness switching to another video card.
lshw -c video
*-display
VGA compatible controller
Madison [Mobility Radeon HD 5000 Series]
Hynix Semiconductor (Hyundai
** Bug watch added: Linux Kernel Bug Tracker #43741
http://bugzilla.kernel.org/show_bug.cgi?id=43741
** Also affects: gnome-control-center via
http://bugzilla.kernel.org/show_bug.cgi?id=43741
Importance: Unknown
Status: Unknown
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** Changed in: gnome-control-center
Status: Unknown = Confirmed
** Changed in: gnome-control-center
Importance: Unknown = Medium
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https://bugs.launchpad.net/bugs/999888
Title:
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-control-center (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/999888
Yes, it also happens in a guest session. I'm attaching the corresponding
~/.xsession-errors
I do not use a background picture on the desktop:
$ gsettings get org.gnome.desktop.background picture-uri
''
$ gsettings reset org.gnome.desktop.background picture-uri
$ gsettings get
** (gsd-backlight-helper:3003): WARNING **: failed to find any devices
is likely the issue, could be a kernel bug...
** Changed in: gnome-control-center (Ubuntu)
Status: Incomplete = New
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Thank you for your bug report, could you add the .xsession-errors from a
session having the issue?
** Changed in: gnome-control-center (Ubuntu)
Importance: Undecided = Low
** Changed in: gnome-control-center (Ubuntu)
Status: Confirmed = Incomplete
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Attaching ~/.xsession-errors
** Attachment added: .xsession-errors
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/999888/+attachment/3176202/+files/.xsession-errors
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Does it happen in a guest session as well?
what does gsettings get org.gnome.desktop.background picture-uri
gives? does doing a gsettings reset on that key solve the issue?
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I also tried to run gnome-control-center with sudo:
$ sudo gnome-control-center screen
(gnome-control-center:3122): screen-cc-panel-WARNING **: Error getting
brightness: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No
such interface `org.gnome.SettingsDaemon.Power.Screen' on object at
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubuntu
Status: New = Confirmed
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Title:
Missing
** Package changed: ubuntu = gnome-control-center (Ubuntu)
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Title:
Missing brightness control in System Settings/Brightness and Lock
To manage
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