| Bug ID | 106006 |
|---|---|
| Summary | Kernel 4.16.0+ switch amdgpu.dc=1 causes screen brightness set to 1 to be dimmed by default |
| Product | DRI |
| Version | unspecified |
| Hardware | x86-64 (AMD64) |
| OS | Linux (All) |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/AMDgpu |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | sass.joel@gmail.com |
I'm noticing that the default screen brightness of my desktop when logged in is set to something beneath "1" when set to "1" with amdgpu.dc=1 switch in the kernel. Test to get to this point: * boot PC - (Grub screen brightness is "normal") * Set kernel value amdgpu.dc=1 and proceed with 4.16.0+ kernel boot - (kernel switches quiet and splash removed, brightness appears normal during boot process) * Lightdm display manager starts (brightness is still "normal") * Log in to any window manager, When X starts, the desktop is immediately darkened with what appears to be a high contrast setting. Looks like equivalent to manual setting I can't actually discern. It's not brightness, necessarily, but the net effect on the desktop is that everything is effectively darker. * I've tested this with Ubuntu's Unity desktop, and gnome-flashback (compiz and metacity), and it behaves the same. When amdgpu.dc=0 is set, desktop appears a normal level of brightness when logging in. It appears from the Xorg.0.log that the AMDGPU module isn't used for X, but brightness isn't affected. I'll include logs from amdgpu.dc=0 and amdgpu.dc=1. Let me know if you need any other logs.
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