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Bug 1594927 - kernel-4.17.2-200.fc28.ppc64le shows blank screen with AMD wx5100
Summary: kernel-4.17.2-200.fc28.ppc64le shows blank screen with AMD wx5100
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: xorg-x11-drv-ati
Version: 28
Hardware: ppc64le
OS: Linux
Target Milestone: ---
Assignee: X/OpenGL Maintenance List
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2018-06-25 18:21 UTC by Alan Mock
Modified: 2018-07-14 14:56 UTC (History)
26 users (show)

Fixed In Version:
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Attachments (Terms of Use)
dmesg output from kernel-4.17.2-200.fc28.ppc64le (deleted)
2018-06-25 18:21 UTC, Alan Mock
no flags Details

Description Alan Mock 2018-06-25 18:21:42 UTC
Created attachment 1454449 [details]
dmesg output from kernel-4.17.2-200.fc28.ppc64le

Description of problem:
With kernel-4.17.2-200.fc28.ppc64le the output of my WX5100 is blank.  With kernel-4.16.16-300.fc28.ppc64le the display worked.

Version-Release number of selected component (if applicable):

How reproducible:
This is 100% reproducible.

Steps to Reproduce:
1. Boot machine with kernel-4.17.2-200.fc28.ppc64le

Actual results:
A blank screen.

Expected results:
The default login screen.

Additional info:
I'm running an AMD WX5100 in a Talos II with dual POWER9 CPUs. There are three lines in the dmesg output for the kernel with the broken display that seem suspicious:

[    4.418241] amdgpu: [powerplay] There must be 1 or more PCIE levels defined in PPTable.
[    4.418305] amdgpu: [powerplay] Failed to populate SCLK during PopulateNewDPMClocksStates Function!
[    4.418415] amdgpu: [powerplay] Failed to populate and upload SCLK MCLK DPM levels!

Comment 1 Alan Mock 2018-06-29 18:22:52 UTC
This only occurs when I have the firmware available for Petitboot to use the WX5100.  When I remove the firmware from Petitboot the 4.17 kernel is able use the display.

Comment 2 dn49i7+hdm8u5shsmcg 2018-07-14 14:56:54 UTC
Same bug here with 4.17.6-200 and an AMD WX7100, removing firmware from petitboot fixes the issue as well

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