Needless to say this isn't very conducive to focus when trying to do productivity work (where the odd thinking pause is required, eg: for coding) so I rather hope this is a bug rather than some sort of executive decision of what's "best" for the user.Follow this procedure to troubleshoot when the notebook power light comes on, HDD activity light activates, but there is no display or very dim LCD.
This means that you loose the regular (useful) auto-dimming which would normally occur within 15 minutes or so of inactivity. The obvious solution of switching off idle-dim doesn't work. You can also use the dconf-editor to achieve this as shown on the OP's screenshot. Thankfully, OP's screenshot has suggested a workaround: simply set idle-brightness to 100% (or whatever your regular brightness setting is).Ī way to achieve this with the CLI is: gsettings set .power idle-brightness 100 I have applied all updates and rebooted a couple of times to no avail. try acpi_listen.Īs of a few days ago (~10-Sept-2018) my laptop, a ThinkPad X1c5, running GNOME on stock Ubuntu 18.04 (kernel 4.15.0-34) has developed a similar issue when running on battery: if I leave it idle for just 15 secs without keyboard or mouse input, it dims automatically. If you are lucky, the EC produces an ACPI event (or some sort of event) you can catch with a custom script, and then turn the backlight back up automatically, but how this works (if at all) will depend entirely on your laptop, so you need to do a bit of reading and sleuthing. On my laptop, I can turn the brightness up again manually. If that is the case, looking at Gnome settings or filing a bug is not going to help. So I very much suspect it is the EC that turns down your backlight after a few seconds of confirming that there's no power from the power supply. For Windows, the pre-installed drivers reasonably support it for Linux, the situation is difficult because of the diversity and lack of documentation.
Unfortunately, every vendor does this differently, and none of this is documented somewhere. Especially on Laptops, the embedded controller (EC) does a lot of things, including power management and controlling of the backlight.
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