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I'm running Arch/KDE Plasma with two GPUs with HDMI cable attached to the primary one.
1. Primary: Intel HD Graphics 4600
2. Secondary: RX580
When I was running with just the RX580 everything was fine. After I changed to the scenario above, I notice huge performance drop on my games. I'm certain that I'm not using my Intel's when running my games. I have no freaking idea of what is happening. Everything seems fine. I can't find anything that could give me a clue.
Xorg conf files:
19-intel.conf: ↓ ↓
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "DRI" "3"
Option "TearFree" "true"
EndSection
20-amdgpu.conf: ↓ ↓
Section "Device"
Identifier "AMD"
Driver "amdgpu"
Option "DRI" "3"
EndSection
Logs:
Xorg.0.log -> https://pastebin.com/485DiQyw
vulkaninfo - Ignore the first three lines. - > https://pastebin.com/zEinCDb9
xrandr -> https://pastebin.com/MBYFuYfu
xrandr --listproviders:
Providers: number : 2
Provider 0: id: 0x47 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 3 outputs: 5 associated providers: 1 name:Intel
Provider 1: id: 0x94 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 6 outputs: 5 associated providers: 1 name:Radeon RX 580 Series @ pci:0000:01:00.0
Solved:
The "Option "TearFree" "true"" at my 19-intel.conf was causing it. Unfortunately, I didn't understand why this was happening and why removing the option solved it. Would be very nice if someone could explain this. Thank you, community.
Last edited by lucasrizzini (2020-08-06 00:02:04)
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Troubleshooting:
It briefly goes away if I reset Xorg restarting the display manager(SDDM) and doesn't happen on power on or restart.
Last edited by lucasrizzini (2020-08-06 07:55:46)
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The Option "TearFree" is a very xf86-video-intel specific option that likely bites itself with what the renderer for amdgpu wants to do. In general from a xorg perspective it would probably be better to use the modesetting driver for the intel... (in general, xf86-video-intel is very sporadically if at all updated) and especially in combination with another GPU.
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Same thing occur without TearFree option.
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