Bug 96768 - Black screen past login with RX 480, Ubuntu 16.04 and AMDgpu-pro 16.30
Summary: Black screen past login with RX 480, Ubuntu 16.04 and AMDgpu-pro 16.30
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/AMDgpu-pro (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Default DRI bug account
QA Contact:
Depends on:
Reported: 2016-07-01 18:43 UTC by pyrignis
Modified: 2016-07-04 07:05 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

output of the dmesg command (142.56 KB, text/plain)
2016-07-01 18:43 UTC, pyrignis
no flags Details

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

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.

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:
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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