I have rebooted using the rc6, rc7 and rc8 versions of kernel 5.4. All 
three booted OK, although I noticed an error message "intramfs unpacking 
failed, decoding failed" when using rc7. I also tried kernels 5.4.28 and 
5.4.41:  5.4.41 booted slowly, with the error messages from the sound 
system. 5.4.28 booted OK, although it produced the same intramfs error 
message as rc7.

On 17/07/2020 06:10, Kai-Heng Feng wrote:
> Would it be possible for you to do a kernel bisection?
>
> First, find the last -rc kernel works and the first -rc kernel doesn’t
> work from http://kernel.ubuntu.com/~kernel-ppa/mainline/
>
> Then,
> $ sudo apt build-dep linux
> $ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> $ cd linux
> $ git bisect start
> $ git bisect good $(the working version you found)
> $ git bisect bad $(the non-working version found)
> $ make localmodconfig
> $ make -j`nproc` deb-pkg
> Install the newly built kernel, then reboot with it.
> If it still have the same issue,
> $ git bisect bad
> Otherwise,
> $ git bisect good
> Repeat to "make -j`nproc` deb-pkg" until you find the offending commit.
>


** Attachment added: "dmesg54rc8"
   https://bugs.launchpad.net/bugs/1884910/+attachment/5393513/+files/dmesg54rc8

** Attachment added: "dmesg5428"
   https://bugs.launchpad.net/bugs/1884910/+attachment/5393514/+files/dmesg5428

** Attachment added: "dmesg5441"
   https://bugs.launchpad.net/bugs/1884910/+attachment/5393515/+files/dmesg5441

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https://bugs.launchpad.net/bugs/1884910

Title:
  Very slow boot with kernel 5.4.0-37-generic

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