Post AX8kqFwtABy1XsOwca by lil5@fosstodon.org
 (DIR) More posts by lil5@fosstodon.org
 (DIR) Post #AX8cEuEa8Th1qoM9D6 by a@social.exozy.me
       2023-06-28T03:48:11Z
       
       0 likes, 0 repeats
       
       For some unknown reason, the computer for exozy.me only displays a black screen when I boot it and plug in a monitor later. I tried enabling SDDM, LightDM, Ly, or no display manager and each time, the same problem happens.If the monitor is plugged in during boot, everything works fine as expected. However, if I plug in the monitor later, I have to SSH into the computer and restart SDDM in order to fix the black screen. Is there perhaps some kernel parameter I need? The computer has an AMD GPU.
       
 (DIR) Post #AX8cNvfAC26Ut85lke by a@social.exozy.me
       2023-06-28T03:49:50Z
       
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       I've been trying to fix this for months. My temporary workaround is to have a systemd socket that starts SDDM, so I can simply send a packet to the machine instead of SSHing in and starting SDDM, but I'd love to have a better solution than this hack.
       
 (DIR) Post #AX8kqFwtABy1XsOwca by lil5@fosstodon.org
       2023-06-28T05:24:33Z
       
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       @a could it be an xorg issue l? Or a monitor queue configuration issue?
       
 (DIR) Post #AX9YZj5qXyyKiju1pI by a@social.exozy.me
       2023-06-28T14:41:50Z
       
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       @lil5 Maybe. But the problem also occurs if I run SDDM using Wayland.
       
 (DIR) Post #AX9ZVBKYEbDEnqB4HA by a@social.exozy.me
       2023-06-28T14:52:14Z
       
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       This seems like kinda a niche problem, but I'd expect Raspberry Pis to also have this issue since RPis don't have a built-in screen and sometimes maybe people boot their RPis and then later plug in a monitor.But apparently RPis have a setting hdmi_force_hotplug=1 in their /boot/config.txt that fixes this. Does this correspond to some kernel parameter or something?
       
 (DIR) Post #AX9ajkVgKnhTv0tUAq by a@social.exozy.me
       2023-06-28T15:06:00Z
       
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       I found a similar kernel parameter: video=HDMI-A-1:3840x2160@60:D (according to https://unix.stackexchange.com/questions/236916/ubuntu-forcing-hdmi-output-on-boot-if-monitor-disconnected)I haven't tried this yet but it seems promising.