Tonga PRO [Radeon R9 285/380] [1002:6939] blank screen

Steven Falco stevenfalco at
Thu Oct 5 16:03:38 UTC 2017

On 10/05/2017 11:16 AM, Deucher, Alexander wrote:
>> -----Original Message-----
>> From: amd-gfx [mailto:amd-gfx-bounces at] On Behalf
>> Of Steven Falco
>> Sent: Thursday, October 05, 2017 10:46 AM
>> To: amd-gfx at
>> Subject: Tonga PRO [Radeon R9 285/380] [1002:6939] blank screen
>> I have a Radeon R9 285/380 video card in a machine that is running Fedora 26.
>> When I run with Fedora kernel version 4.11.11 the video card works properly,
>> using the amdgpu kernel driver.
>> However, once I upgrade to a newer kernel in the 4.12 or 4.13 series, my
>> display goes blank during boot and stays that way.  The monitor appears to
>> be getting sync, because it doesn't go to sleep, however there is nothing
>> visible on the screen.
>> What information should I post to this list to help diagnose the problem?
> Please file a bug report ( and attach your xorg log and dmesg output.
> Thanks!
> Alex

Ok, I've created bug 103111.  It turns out that the monitor does eventually show some output (after waiting several minutes), but the system never boots up to a normal login screen.  Instead, I just keep seeing error messages.  I've attached both good and bad log files.

Curiously, it looks like X restarts at some point, because I get two Xorg.0.log files.  I've attached both.  bad.Xorg.0.log is the first bad one and Xorg.0.log is the second bad one.


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