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 takes
about 2 1/2 minutes to get to a working desktop. Doing the same startup
with the old 4.15 kernel (in the 20.04 beta) takes approximately 25
seconds to a working desktop. Similarly, changing display settings,
waking from sleep and shutting down the computer all take several
minutes with the 5.4 kernel, vs 10-30 seconds with the 4.15 kernel.
To provide more information, I tried starting up this computer with the
5.3 kernel from a 19.10 live USB, and from a 5.0 kernel in the
Peppermint Linux live USB that is based on Ubuntu. The 5.3 kernel is as
slow as the 5.4 kernel, whereas the 5.0 kernel works similarly to the
4.15 LTS kernel.
I suspect that the problem relates to the Radeon m9 390x video card in
my iMac, but I have no idea what might have changed in the newer kernels
to affect their compatibility with this iMac.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-25-generic 5.4.0-25.29
ProcVersionSignature: Ubuntu 5.4.0-25.29-generic 5.4.30
Uname: Linux 5.4.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: mfox 2497 F.... pulseaudio
/dev/snd/controlC0: mfox 2497 F.... pulseaudio
/dev/snd/controlC1: mfox 2497 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 21 10:55:18 2020
HibernationDevice: # RESUME=UUID=5e4ca488-e781-4ee7-aeb3-8adc968cd22a
InstallationDate: Installed on 2018-05-09 (712 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
MachineType: Apple Inc. iMac17,1
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_CA.UTF-8
SHELL=/bin/bash
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: \boot\vmlinuz-5.4.0-25-generic ro
root=UUID=0559983a-7175-4ab1-af46-7a117ee78ead
initrd=boot\initrd.img-5.4.0-25-generic
RelatedPackageVersions:
linux-restricted-modules-5.4.0-25-generic N/A
linux-backports-modules-5.4.0-25-generic N/A
linux-firmware 1.187
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/31/2020
dmi.bios.vendor: Apple Inc.
dmi.bios.version: 176.0.0.0.0
dmi.board.name: Mac-B809C3757DA9BB8D
dmi.board.vendor: Apple Inc.
dmi.board.version: iMac17,1
dmi.chassis.type: 9
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-B809C3757DA9BB8D
dmi.modalias:
dmi:bvnAppleInc.:bvr176.0.0.0.0:bd01/31/2020:svnAppleInc.:pniMac17,1:pvr1.0:rvnAppleInc.:rnMac-B809C3757DA9BB8D:rvriMac17,1:cvnAppleInc.:ct9:cvrMac-B809C3757DA9BB8D:
dmi.product.family: iMac17,1
dmi.product.name: iMac17,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
** Attachment added: "SystemD critical chain and blame outputs: 5.4 vs 4.15
kernel"
https://bugs.launchpad.net/bugs/1874104/+attachment/5357597/+files/SystemD%20report_Ubuntu_20.04beta_late_2015_iMac.odt
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1874104
Title:
Very slow boot, wake from sleep and shutdown with 5.4 kernel
Status in linux package in Ubuntu:
New
Bug description:
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
takes about 2 1/2 minutes to get to a working desktop. Doing the same
startup with the old 4.15 kernel (in the 20.04 beta) takes
approximately 25 seconds to a working desktop. Similarly, changing
display settings, waking from sleep and shutting down the computer all
take several minutes with the 5.4 kernel, vs 10-30 seconds with the
4.15 kernel.
To provide more information, I tried starting up this computer with
the 5.3 kernel from a 19.10 live USB, and from a 5.0 kernel in the
Peppermint Linux live USB that is based on Ubuntu. The 5.3 kernel is
as slow as the 5.4 kernel, whereas the 5.0 kernel works similarly to
the 4.15 LTS kernel.
I suspect that the problem relates to the Radeon m9 390x video card in
my iMac, but I have no idea what might have changed in the newer
kernels to affect their compatibility with this iMac.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-25-generic 5.4.0-25.29
ProcVersionSignature: Ubuntu 5.4.0-25.29-generic 5.4.30
Uname: Linux 5.4.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: mfox 2497 F.... pulseaudio
/dev/snd/controlC0: mfox 2497 F.... pulseaudio
/dev/snd/controlC1: mfox 2497 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 21 10:55:18 2020
HibernationDevice: # RESUME=UUID=5e4ca488-e781-4ee7-aeb3-8adc968cd22a
InstallationDate: Installed on 2018-05-09 (712 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
MachineType: Apple Inc. iMac17,1
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_CA.UTF-8
SHELL=/bin/bash
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: \boot\vmlinuz-5.4.0-25-generic ro
root=UUID=0559983a-7175-4ab1-af46-7a117ee78ead
initrd=boot\initrd.img-5.4.0-25-generic
RelatedPackageVersions:
linux-restricted-modules-5.4.0-25-generic N/A
linux-backports-modules-5.4.0-25-generic N/A
linux-firmware 1.187
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/31/2020
dmi.bios.vendor: Apple Inc.
dmi.bios.version: 176.0.0.0.0
dmi.board.name: Mac-B809C3757DA9BB8D
dmi.board.vendor: Apple Inc.
dmi.board.version: iMac17,1
dmi.chassis.type: 9
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-B809C3757DA9BB8D
dmi.modalias:
dmi:bvnAppleInc.:bvr176.0.0.0.0:bd01/31/2020:svnAppleInc.:pniMac17,1:pvr1.0:rvnAppleInc.:rnMac-B809C3757DA9BB8D:rvriMac17,1:cvnAppleInc.:ct9:cvrMac-B809C3757DA9BB8D:
dmi.product.family: iMac17,1
dmi.product.name: iMac17,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
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