[Mesa-dev] [Bug 106187] Vulkan apps run on secondary GPU on multi-GPU system

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106187

            Bug ID: 106187
           Summary: Vulkan apps run on secondary GPU on multi-GPU system
           Product: Mesa
           Version: 17.3
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/radeon
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: brisse at outlook.com
        QA Contact: mesa-dev at lists.freedesktop.org

Created attachment 138997
  --> https://bugs.freedesktop.org/attachment.cgi?id=138997&action=edit
GPU selection in launcher for RotTR

I have two Sapphire R9 Fury's and Vulkan apps default to run on my secondary
headless card which performs worse compared to using the primary card.

I was actually in contact with Feral Interactive support about this after
seeing the issue in Rise of the Tomb Raider, but they claim it's a Vulkan
loader or driver issue, so why don't I just paste the e-mail here as it
describes the problem in more detail:

"Hi Feral!
This isn't really a support request. It's more of a suggestion for improving
performance on multi-GPU systems.
I'm on Debian Sid with kernel 4.15 and Mesa 17.3.9 and noticed that Vulkan
games, including Rise of the Tomb Raider runs on my secondary GPU.
By switching over to my primary GPU in the Feral launcher, I've increased my
benchmark score from 60fps to 73fps (1080p high) and the game runs noticably
smoother. This is something I have to do every time I launch the game becouse
the setting resets between play sessions.
I'ts a bit wierd that the primary GPU is in the bottom of the list. I wonder if
this is a RADV issue since it happens in all Vulkan applications, including non
Feral apps.


Debian Sid
Kernel 4.15
Mesa 17.3.9
Ryzen 1700X
Asus PRIME X370-PRO
32GiB DDR4-2400 cl14
Sapphire Nitro R9 Fury (two of them)"

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