Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.2-rc5/
If the issue persists, please file an upstream bug at
https://bugs.freedesktop.org/
Product: DRI
Component: DRM/intel
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Thanks for those logs. They show the problem happening immediately, as
soon as 2.5 seconds after the kernel starts.
This bug is now assigned to the kernel ('linux' component). I believe
this is a kernel bug, if not a hardware fault.
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** Attachment added: "journalctl -b0 from successful screen activation"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1830792/+attachment/5270412/+files/journal.txt
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This time I turned off the displayed, unplugged it, then left it
unplugged while I rebooted. After rebooting and logging in, I turned on
the display and plugged it in. Attached is the dmesg from this boot.
** Attachment added: "dmesg from functional boot"
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