Bug 96768

Summary: Black screen past login with RX 480, Ubuntu 16.04 and AMDgpu-pro 16.30
Product: DRI Reporter: pyrignis
Component: DRM/AMDgpu-proAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED NOTOURBUG QA Contact:
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
output of the dmesg command none

Description pyrignis 2016-07-01 18:43:32 UTC 
Created attachment 124845 [details]
output of the dmesg command

Symptoms:
Login screen renders properly
Past login, the screen turns black, with the pointer visible and a blank pixel in the upper left corner.
On some occasion the pointer turns from the arrow to the vertical bar.
crtl+alt+F<whaterver> works and brings the user to the tty.

all symptoms are reverted when the llvm driver is used.

System:
Ubuntu 16.04 Gnome edition (but even with unity installed and configured as default the symptoms are the same)
AMD Radeon RX 480 8G
AMDgpu-pro 16.30
4.4 kernel

The dmesg file is the output of the command after a tty return with ctrl+alt+F4.

original description here:
https://www.phoronix.com/forums/forum/linux-graphics-x-org-drivers/amd-linux/881991-rx-480-on-ubuntu-has-anyone-been-able-to-use-it
Comment 1 Michel Dänzer 2016-07-04 07:05:14 UTC 
From what I read on the Phoronix forums, this happens because some COGL shaders fail to compile. So it's a bug in either COGL or the AMDGPU-PRO OpenGL driver. In neither case is this the appropriate place to track it.

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