[Mesa-dev] [Bug 103921] llvmpipe consume all resources on GPU Vega RX (amdgpu driver) with mesa 17.2.4 if disabled IGPU

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103921

            Bug ID: 103921
           Summary: llvmpipe consume all resources on GPU Vega RX (amdgpu
                    driver) with mesa 17.2.4 if disabled IGPU
           Product: Mesa
           Version: 17.2
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: mikhail.v.gavrilov at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

How reproduce:
1. On Fedora 27 compile and install latest amdgpu driver from branch
amd-staging-drm-next by this instruction
https://fedoraproject.org/wiki/Building_a_custom_kernel
Or install mainline vanilla kernel from this repo
https://fedoraproject.org/wiki/Kernel_Vanilla_Repositories
If you don't make this step Vega RX would be runned under VESA driver which
don't have this issue.
2. By default Fedora 27 shipped with mesa 17.2.4, don't update it to 17.4 from
CORP repo.
3. Restart computer.
4. Goto BIOS and disable IGPU if it was enabled.


Expected result: llvmpipe should work with amdgpu same as with VESA driver
without consuming all CPU resources.


Interesting note:
If go in BIOS and enable Intel GPU graphics without without reconnecting
monitor to mother board (means monitor still connected to Radeon VEGA RX card)
then this issue is gone. Why? In this case still used llvmpipe and amdgpu
driver.


Demonstration: https://youtu.be/rFDeR8-_yMo

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