I'm using two monitors with AMD Radeon RX570 and Intel onboard graphics on CentOS 8. (My CPU is i3-8100 @ 3.60GHz.)
I have screen tearing on the 2nd monitor which is rendered by Intel onboard graphics when moving a window or watching video.
After googling, I got the information that
PRIME Synchronization makes the 2nd monitor tear-free. To check it, I ran
xrandr --props. The below output is extracted from it.
xrandr --props ... HDMI-1-1 connected 1920x1200+1920+0 (normal left inverted right x axis y axis) 518mm x 324mm _MUTTER_PRESENTATION_OUTPUT: 0 EDID: 00ffffffffffff0038c3240200000000 0811010380342078ea8cb5a7554d9f26 0c5054afef8071408140818081c0a940 b301d1c00101283c80a070b023403020 260006442100001a243680a070381f40 3020250030303100001a000000fd0038 4b1f4d11000a202020202020000000fc 0056434231303739480a2020202001ac 020318f2450405030290230904046503 0c001000830100008c0ad08a20e02d10 103e9600c48e210000188c0ad08a20e0 2d10103e9600138e2100001800000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 0000000000000000000000000000004b PRIME Synchronization: 0 supported: 0, 1 Content Protection: Undesired supported: Undesired, Desired, Enabled aspect ratio: Automatic supported: Automatic, 4:3, 16:9 Broadcast RGB: Automatic supported: Automatic, Full, Limited 16:235 audio: auto supported: force-dvi, off, auto, on link-status: Good supported: Good, Bad CONNECTOR_ID: 71 supported: 71 non-desktop: 0 range: (0, 1) ...
PRIME Synchronization, I ran
xrandr --output HDMI-1-1 --set "PRIME Synchronization" 1. But, after I ran it, the 2nd monitor flicked (maybe it seems to be turned off and on quickly), and then the setting was reset to 0 again.
This situation can only be met after installing AMD linux driver for CentOS 8 v19.30, which is the recent driver at this time. If I don't install it (it means I use the default driver which is included in CentOS 8), screen tearing doesn't occur and
PRIME Synchronization is 1 for the 2nd monitor. But, I should use AMD driver instead of the default driver.
How can I set
PRIME Synchronization to 1? Or how can I find why it cannot be set to 1?
FYI, some information what I know are as below:
lspci -nn | grep "VGA\|Display" 00:02.0 Display controller : Intel Corporation 8th Gen Core Processor Gaussian Mixture Model [8086:3e91] 01:00.0 VGA compatible controller : Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] [1002:67df] (rev ef)
xrandr --listproviders Providers: number : 2 Provider 0: id: 0xa2 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 6 outputs: 5 associated providers: 1 name:Radeon RX 570 Series @ pci:0000:01:00.0 Provider 1: id: 0x45 cap: 0x2, Sink Output crtcs: 3 outputs: 3 associated providers: 1 name:modesetting