Comment 0 for bug 1438754

This affects 14.04 LTS. I haven't tried any more recent versions.

When the screen is locked, it is not possible to use the Fn+Brightness up/down keys.

If I am using an external monitor, then I turn down the backlight brightness to zero. I often use my laptop at the office with an external monitor and the backlight turned off. When I come home and resume, the backlight is off and I cannot switch it on to see the login prompt.

Steps to reproduce
1. Set backlight brightness to off using Fn+brightness down
2. Lock computer with Super+L
3. Attempt to increase brightness with Fn+brightness up

Expected results:
Backlight switches on, and Lock/login screen becomes visible

Actual results:
Backlight remains off and Lock/login screen is not visible

This is a regression in 14.04 LTS since the 14.04 release. I can't remember when this started happening, but it's been at least a few weeks.