Sorry Timo, I had missed your last comment.
It's not a regression. The same thing happens on a 18.04.2 live session.
Please find attached a snapshot of the BIOS screen.
As you can see, there are two options:
- Enable Switchable Graphics (1)
- Discrete Graphics Controller Direct Output Mode (2)
I tried to start the 19.04 beta live USB in the four possible cases,
here are the results:
(1) | (2) | Comments
-----+-----+-------------------------------------------------------------------
[ ] | [ ] | Issue described in original description
-----+-----+-------------------------------------------------------------------
[ ] | [X] | Issue described in original description
-----+-----+-------------------------------------------------------------------
[X] | [ ] | OK (/sys/class/backlight/ has only one element: "intel_backlight"
| | Backlight can be adjusted with backlight keys
| | `lspci` freezes, probably because of a nouveau bug
| | Enough to install Ubuntu and switch to nvidia closed drivers
-----+-----+-------------------------------------------------------------------
[X] | [X] | OK (/sys/class/backlight/ has only one element: "intel_backlight"
| | Backlight can be adjusted with backlight keys
| | `lspci` freezes, probably because of a nouveau bug
| | Enough to install Ubuntu and switch to nvidia closed drivers
-----+-----+-------------------------------------------------------------------
** Attachment added: "20190403_100225.jpg"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1821882/+attachment/5252334/+files/20190403_100225.jpg
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1821882
Title:
Screen is very dark and brightness cannot be adjusted
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