I also tried fractional scaling; got the same delay. And when I tried
adjusting the resolution to 1920x1080 directly with the resolution
setting instead of 200% magnification, I got the delay again. So the
only fast adjustment is with magnification and no fractional scaling.
Attached is the System
This one is a bit of an improvement. Boot time to a working desktop was
about 3 minutes. But most interesting was that I could change my display
resolution almost instantly with a 200% magnification. Attempting to
change by adjusting the resolution directly (from 3840x2160 to
2560x1440) caused the
Is this still problem for you with v5.8-rc2?
https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D
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Title:
Cannot be past login screen in kerne
I just tested the latest kernel, and it is worse. This time it didn't
even make it to the login screen, and I let it run for 5 minutes. dmesg
from that boot attempt is attached.
Given the lack of success at booting kernels from 5.3 - 5.7, I'm
wondering whether this 2015 iMac is going to be a viabl
Could you test latest kernel from drm-tip ppa?
https://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/?C=M;O=D
Also did you report this bug at https://bugzilla.kernel.org/enter_bug.cgi
under drivers Video (DRI non Intel) as we guess this is bug in amdgpu driver?
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I just tested rc4, and now I can no longer log in; same as with rc2. So
to summarize, I cannot get past the login screen with versions rc2 and
rc4, whereas I could with rc3
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https://bugs.l
You should report mainline kernel issues to kernel bugzilla
https://bugzilla.kernel.org/ instead.
** Changed in: linux (Ubuntu)
Status: Confirmed => Invalid
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I can report that kernel 5.7.0-050700-rc3 now boots (but very slowly).
Unlike rc2, it gets past the login screen.
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Title:
Cannot be past login sc
Attached is the dmesg from kernel 5.4.0.26, which boots slowly on this
iMac, but at least boots all the way to a working desktop. You can
contrast this to the dmesg of 5.7.0-050700-rc2, which won't boot past
the login screen.
** Attachment added: "dmesg for 5.4.0-26 boot"
https://bugs.launchpa
Instructions were to include information from About in Settings.
Screenshot attached.
** Attachment added: "About my late 2015 27" iMac with the kernel booting
issues"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1875211/+attachment/5360987/+files/About%20my%20computer.png
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