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
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
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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h
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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https://bugs.launchpad.net/bugs/1875211
Title:
Cannot be
5.7-rc3 boots on my iMac. It gets past the login screen (unlike rc2),
but it still has the slow boot problem.
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https://bugs.launchpad.net/bugs/1874104
Title:
Very slow boot
I made a separate report of the 5.7-rc2 kernel bug to ubuntu-bug linux
as you requested. I will also try to monitor the upstream rc kernels and
run tests on them as you have requested.
I agree that the slow boot bug is likely connected to the AMD video card
in my iMac, and thus to the amdgpu drive
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
Public bug reported:
This is an extension of the "slow boot" bug I reported earlier [Bug
1874104]. I have been working with Jouni Mettala, and he was asking me
to try the most recent kernels, including the latest in development
(5.7.0-050700-rc2). This one not only boots very slowly, but also, I
c
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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I forgot to send you the proper dmesg for the boot of kernel 5.3rc-1. It
is attached. This kernel was not only slow, but it didn't pick up my
wireless card. This was the only kernel I tried that did this.
** Attachment added: "dmesg for 5.3rc1 boot"
https://bugs.launchpad.net/ubuntu/+source/li
I will report the login bug as a new one. As far as bisection past
identifying the line of progression to identify the last kernel that
works and the first one that doesn't, I looked at the further steps one
would have to take and I don't think that my technical capability is up
to it. I have never
Attached is the SystemD analysis for the 5.6 boot. It looks pretty
similar to that of all the kernels I have tried that are 5.3 or newer.
** Attachment added: "SystemD critical chain and blame outputs: 5.6 kernel"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874104/+attachment/5360469
It is possible to login with kernel 5.6. The bootup is slow, but it does
boot and gets past the login screen. I have attached the dmesg from that
boot, and will send the systemd analysis in the next message.
** Attachment added: "dmesg.0 for 5.6 boot"
https://bugs.launchpad.net/ubuntu/+source/
I did the bisection and found that the bad kernels started at 5.3-rc1.
The last 5.2 kernel, 5.2.21, was good. I have attached the SystemD
analysis here of the boots of both kernels. You can see from it that the
problem in rc1 is related to the gpu-manager service.
I will attach the dmesg log of th
Here is the dmesg log for the bad boot of 5.3-rc1.
** Attachment added: "Log of 5.3-rc1 kernel boot"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874104/+attachment/5359789/+files/dmesg.0
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I should add that I tested kernels 5.2.15, 5.2.18 and 5.2.20 as well.
All were OK, so the good-bad line is clearly after 5.2.21.
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Titl
This time with the last fast kernel, 5.2. The bootup was slightly slower
than with 4.15, but I think this might relate to snap module loading. I
should also point out that the difference between kernels 4.15, 5.1 and
5.2 vs the kernels after 5.3 is more than what is indicated by the
SystemD analysi
Finally, a second dmesg for the 5.2 kernel boot.(I'm not sure whether
dmesg or dmesg.0 is the right one.
** Attachment added: "dmesg.0 for 5.2 boot (I hope)"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874104/+attachment/5359527/+files/dmesg.0
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Next is the first of two dmesg logs for the 5.2 kernel.
** Attachment added: "dmesg for 5.2 boot (I hope)"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874104/+attachment/5359510/+files/dmesg
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Next, dmesg.0
** Attachment added: "dmesg.0 for 5.3 boot (I hope)"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874104/+attachment/5359503/+files/dmesg.0
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https:
Next, a dmesg for that boot. Not sure which it is so I'll send two.
** Attachment added: "dmesg for 5.3 boot (I hope)"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874104/+attachment/5359502/+files/dmesg
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I uninstalled Virtualbox and tested kernels 5.1 and 5.2. Both showed
fast boots similar to 4.15. I then tested 5.3 by downloading it from the
ppa/mailine. This is where the slow boot started. I have attached two
dmesg's and a systemd analysis of the critical chain and blame for
kernel 5.3. I can't
I hope this is what you were looking for. In your message, you noted
that the login bug is likely a separate issue and it could be reported
as new. I thought that this is what I already did. If not, should I
report it again? And with what attachments? Thanks.
** Attachment added: "dmesg.0"
htt
Thanks for the quick reply. I installed and tested 5.7-rc2 as per
instructions. The new kernel booted up to the login screen, but as
slowly as 5.4.0-25. (Over 2 minutes to the login screen.) When I logged
in with my password, all that happened was that I was returned to the
login screen. I tried lo
Public bug reported:
I upgraded a Ubuntu 18.04 installation to 20.04 beta on my late 2015 5k
27" iMac. The new 5.4 kernel was installed and has been updated a few
times. The former LTS kernel (4.15) was retained. When I start up the
computer with the new kernel, the process is very slow and it tak
I can report the same, Dell xps 13- 9343 running Ubuntu 16.04 with
kernel 4.4.0-24 as well as 4.4.0-22.
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https://bugs.launchpad.net/bugs/1572659
Title:
bcmwl driver does no
As reported in related bug #1518715, "ip rule flush" is also impacted.
It appears to hang (never complete).
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https://bugs.launchpad.net/bugs/1514785
Title:
kerne
I echo the comments of others that this makes it hard to manage the
system. But I'd go further to say it's impossible to manage the system.
If we're using rules, we have to be able to see what they are.
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I have the same problem in 3.16.0-53. I filed bug #1518715 which may be
the same thing.
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Title:
kernel 3.16.0.52+53 - ip
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