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That can be done like this:
# Vulkan
RADV_TEX_ANISO=16
# OpenGL
AMD_TEX_ANISO=16
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I just purchased a 6800 XT last week, so this has been my first experience with a Radeon card in many years. One key thing to know is that there is no official graphical control panel from AMD, so you'll be doing a long of config file work. I personally enjoy that part of Linux anyway, so it wasn't bad for me.
Desktop usage seems to work light years better than Nvidia. I had so many hacks with my Nvidia cards to keep apps from tearing, animations not performing well, etc. AMD's desktop support seems to be flawless. Mind you, I couldn't use the built-in Mesa driver because it's not available for my card yet, but the open AMDGPU driver from AMD's website worked.
Freesync is the biggest pain. I just finally got it working last night after I found out you have to disable compositing to get it to work. I believe it does not work in windowed mode.
Performance wise, it's hard to tell because I went from a GTX 1070 to an RX 6800 XT. Everything is maxed out on every game for me at 1440p. I soon realized I had to download vulkan drivers separately (something that was in the release notes for the driver but not explained well). Most of the ins and outs I had to learn from forums like this one, so there is a bit of a learning curve. Obviously, it'll be easy for older cards since the driver is literally built into the kernel.
If there's anything I didn't answer, I'd be happy to share more of my experience.
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You can get the latest kernels on Ubuntu derivatives from Ubuntu's kernel PPA (easy to install and manage with the aptly named Ubuntu Mainline Kernel Installer ), and Mesa + LLVM from Kisak's Mesa PPA. If you don't like messing with PPAs, I guess the proprietary AMDGPU driver is a valid option.
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You probably want compositing to be disabled for full-screen anyway, because then you'll have control over Vsync, lower latency, and better framepacing. In vanilla KWin, you'll want to enable "Allow applications to block compositing". There's also the kwin-lowlatency fork which I highly recommend, as it runs compositing at the display refresh rate and reintroduces the option to automatically disable compositing for full-screen applications.
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So I put this in my .profile and that should take care of it right? Like:
# Vulkan
export RADV_TEX_ANISO=16
# OpenGL
export AMD_TEX_ANISO=16
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Yes, if you want that to be just always enabled for everything. I usually put such exports in my game launchers scripts.
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Thanks for bringing that to my attention. I've just been doing Alt+Shift+F12 every time I want to play a game. Having it done automatically would be awesome.
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Yeah, that's a common point - to enable adaptive sync, you need to disable compositing if you have X11 session. I just also do with Alt+Shift+F12.
"Allow applications to block composting" setting is fine and works with native games or video players, but it doesn't work for Wine games somehow. So I just do it manually in such cases.
Last edited by Shmerl on 26 November 2020 at 10:58 pm UTC
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You can disable compositing on a per-app basis by right-clicking the titlebar and going to More Actions -> Configure Special Application Settings. There you can add a "Block compositing" property. Make sure it's set to "Force" (not "Do Not Affect"), and "Yes".