I hit shutdown, and the monitors go through more slow switching between various stages.It's not in the video, but KDE display configuration shows all monitors are enabled, and has virtual screen space allocated and usable for them. I hit printscreen, which shows the x server thinks it's displaying on all 5 monitors.The monitors slowly switch between various stages of being tty and mirrored, no signal, on but dark, off with amber, and it's 60 seconds before it stabalizes with monitors 1, 3, and 4 being displayed independently, with 2 and 5 off. It takes 16 seconds, instead of the typical 5 seconds. At KMS, monitors 1, 3, and 4 wind up being mirrored, with 1 getting no signal momentarily.From POST to late KMS, monitors 1 and 2 are mirrored, and 3-5 are off with amber LED's.Monitor 2 is daisy chained off 1, and 5 is daisy chained off 4. Monitors 1, 3, and 4 are connected to the card. In my text below for each video, I refer to the monitors with numbers from left to right. Here are videos of 5.12 with the bug, and 5.5.13 without it. AMD package version: No package, only kernel amdgpu.Custom kernel: Various commits, mentioned elsewhere.Kernel version: Bug happens on 5.6 - 5.12, so I run 5.5.13 to avoid it.Emerson LCD TV using Highwings HDMI 2.0, rated for 4K 60Hz. 2 of the Acer LCD's have another one daisy chained off them, and 1 is by itself. Type of Display Connection: Acer LCD's using Accell DisplayPort 1.2 HBR2 VESA-Cerified cable B142C-007B, rated for 4K 60Hz.During all testing, the LCD TV was off - seen, but off. Display(s): (5) Acer K272HUL, (1) Emerson LCD TV.System Memory: 64GB (Samsung 8x8GB 1066MHz PC3-8500 ECC Registered).GPU: Vega 10 XL/XT (rev c1) - Sapphire 2G (Radeon RX Vega 64 8GB).I've tried many versions after 5.5.13, including at least one in each major release. I've been running linux 5.5.13 for about a year due to this, and haven't had any of these problems, including versions before that going back around an additional year. I haven't been able to replicate having a lucky boot with all 5 on in 5.12, but maybe I've just been unlucky. So, that 5.12 leaves only the daisy chained ones off could be a red herring. This has been happening since linux 5.6, although along the way other versions would randomly and rarely get all 5 on, and didn't seem to consistently have only the monitors plugged directly into the video card on. *** sysfs, xrandr, and KDE Plasma Display Configuration show all 5 monitors are properly connected and in use, even when the video card has turned them off! *** ![]() Those 2 that are off are momentarily on during the switching mode problems, but all 5 aren't on at once. They seem to always stabilize with having the 3 monitors directly connected to the video card on, and the 2 daisy chained off them to being off. On linux 5.12, when switching modes, including early or late KMS, my 5 monitors slowly switch between: being on and properly displayed on but pure black and off.
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