confirmed on second machine - Lenovo T530 and X230 have the issue.
** Changed in: xorg (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1271410
Title:
screen brightness does not work after removal of second monitor
Status in “xorg” package in Ubuntu:
Confirmed
Bug description:
Description: Ubuntu Trusty Tahr (development branch)
Release: 14.04
Conditions: Attach second monitor while on batter power. Remove
second monitor.
Expected behavior: Screen brightness would stay at current setting
and be adjustable using function keys or system settings.
Actual behavior: Screen brightness is dim to lowest level and not
adjustable using functions keys or system settings.
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