Bug 207999

Summary: Screen goes black when loaded i915kms
Product: Base System Reporter: Johannes Lundberg <johalun0>
Component: kernAssignee: freebsd-bugs (Nobody) <bugs>
Status: Closed Overcome By Events    
Severity: Affects Some People CC: amd64, grahamperrin, jpm820
Priority: --- Keywords: i915
Version: CURRENT   
Hardware: amd64   
OS: Any   
Description Flags
dmesg none

Description Johannes Lundberg 2016-03-14 21:53:46 UTC
Created attachment 168187 [details]

2012 Macbook Air (Sandybridge)

Brightness is set to 0 when loading i915kms from console with kldload.
Blindly (or via ssh) typing intel_backlight 80 restores brightness.

Setting hw.acpi.video.lcd0.fullpower = some value in loader.conf does not help.
Comment 1 Joe Maloney 2016-08-26 14:46:29 UTC
I can confirm this behavior when booted using BIOS mode.  VT works fine after KMS is loaded using EFI mode.  I can confirm this with nvidia-modeset, and radeomkms as well.  All work fine when using EFI.
Comment 2 Joe Maloney 2016-08-26 14:48:22 UTC
I think this may be related to: