I suggest that you remove/disable xfce4-power-manager and test again.
Furthermore, we need details about your GPU + used driver. Please attach
the output of "lspci -v" to this bug report.
** Changed in: xfce4-power-manager (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1384515
Title:
Laptop screen dims on logout
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