[Bug 111987] Unstable performance (periodic and repeating patterns of fps change) and changing VDDGFX

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111987

--- Comment #6 from Witold Baryluk <witold.baryluk+freedesktop at gmail.com> ---
lspci:

43:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Fiji
[Radeon R9 FURY / NANO Series] (rev c8) (prog-if 00 [VGA controller])
        Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Radeon R9 FURY X /
NANO
        Flags: bus master, fast devsel, latency 0, IRQ 65, NUMA node 1
        Memory at 80000000 (64-bit, prefetchable) [size=256M]
        Memory at 90000000 (64-bit, prefetchable) [size=2M]
        I/O ports at 8000 [size=256]
        Memory at 9f800000 (32-bit, non-prefetchable) [size=256K]
        Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [48] Vendor Specific Information: Len=08 <?>
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010
<?>
        Capabilities: [150] Advanced Error Reporting
        Capabilities: [200] Resizable BAR <?>
        Capabilities: [270] Secondary PCI Express <?>
        Capabilities: [2b0] Address Translation Service (ATS)
        Capabilities: [2c0] Page Request Interface (PRI)
        Capabilities: [2d0] Process Address Space ID (PASID)
        Capabilities: [328] Alternative Routing-ID Interpretation (ARI)
        Kernel driver in use: amdgpu
        Kernel modules: amdgpu

43:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Fiji HDMI/DP Audio
[Radeon R9 Nano / FURY/FURY X]
        Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Fiji HDMI/DP Audio
[Radeon R9 Nano / FURY/FURY X]
        Flags: bus master, fast devsel, latency 0, IRQ 164, NUMA node 1
        Memory at 9f860000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [48] Vendor Specific Information: Len=08 <?>
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010
<?>
        Capabilities: [150] Advanced Error Reporting
        Capabilities: [328] Alternative Routing-ID Interpretation (ARI)
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel

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