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Thread: Kernel 5.5

  1. #1
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    Kernel 5.5

    RC1 is out.
    Code:
    Generating grub configuration file ...
    Found linux image: /boot/vmlinuz-5.5.0-050500rc1-lowlatency
    Found initrd image: /boot/initrd.img-5.5.0-050500rc1-lowlatency
    Found linux image: /boot/vmlinuz-5.5.0-050500rc1-generic
    Found initrd image: /boot/initrd.img-5.5.0-050500rc1-generic
    Found linux image: /boot/vmlinuz-5.5.0-999-lowlatency
    Found initrd image: /boot/initrd.img-5.5.0-999-lowlatency
    Found linux image: /boot/vmlinuz-5.5.0-999-generic
    Found initrd image: /boot/initrd.img-5.5.0-999-generic
    Found linux image: /boot/vmlinuz-5.5.0-994-lowlatency
    Found initrd image: /boot/initrd.img-5.5.0-994-lowlatency
    Found linux image: /boot/vmlinuz-5.5.0-994-generic
    Found initrd image: /boot/initrd.img-5.5.0-994-generic
    Found linux image: /boot/vmlinuz-5.3.0-25-lowlatency
    Found initrd image: /boot/initrd.img-5.3.0-25-lowlatency
    Found linux image: /boot/vmlinuz-5.3.0-25-generic
    Found initrd image: /boot/initrd.img-5.3.0-25-generic
    Ignota nulla curatio morbi.

  2. #2
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    Kernel 5.5 rc1 available

    Kernel 5.5 rc1 is available and is owrking fine here.

  3. #3
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    Re: Kernel 5.5 rc1 available

    Ignota nulla curatio morbi.

  4. #4
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    Re: Kernel 5.5

    Threads merged

  5. #5
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    Re: Kernel 5.5

    Kernel 5.5-rc2 is available:

    Code:
    doug@s18:~$ uname -a
    Linux s18 5.5.0-050500rc2-lowlatency #201912151930 SMP PREEMPT Mon Dec 16 00:45:08 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
    I have only been running it for a few minutes, but I ran 5.5-rc1 for most of the week without issues.

    Link back trail to previous Kernel rc series threads: 5.4, 5.3, 5.2, 5.1, 5.0, 4.20, 4.19 ?, 4.18, 4.17, 4.16, 4.15, 4.14.
    Any follow-up information on your issue would be appreciated. Please have the courtesy to report back.

  6. #6
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    Re: Kernel 5.5

    Among other kernel configuration changes, sometime during the kernel 5.4-rc series Ubuntu changed from "CONFIG_UCLAMP_TASK_GROUP is not set" to "CONFIG_UCLAMP_TASK_GROUP=y".
    The new cgroup v2 related code involved was only added as of kernel 5.4-rc1, and it has issues.
    On one of two Ubuntu server test computers, when the schedutil CPU frequency scaling governor is used with either the acpi-cpufreq or intel_cpufreq CPU frequency scaling drivers, the system response is more like the performance governor as opposed to the expected response of the schedutil governor.
    From what I've experienced, and been challenged by, it is premature to be setting CONFIG_UCLAMP_TASK_GROUP in the kernel configuration, and if I reset it, the resulting system response is as expected for the schedutil governor.

    This issue has being driving me crazy for over a month. I have misdiagnosed it and come to incorrect conclusions several times. After a few weeks, someone upstream followed up, and now it is finally understood.

    References:
    Proposed patch
    proposed patch test results
    pre-patch test reaults
    Last edited by Doug S; December 28th, 2019 at 12:29 AM.
    Any follow-up information on your issue would be appreciated. Please have the courtesy to report back.

  7. #7
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    Re: Kernel 5.5

    also rc6 is here
    Code:
    corrado@corrado-p9-ff-0104-x:~$ inxi -Sxx
    System:
      Host: corrado-p9-ff-0104-x Kernel: 5.5.0-050500rc6-generic x86_64 bits: 64 
      compiler: gcc v: 9.2.1 Desktop: Gnome 3.34.3 wm: gnome-shell dm: GDM3 
      Distro: Ubuntu 20.04 LTS (Focal Fossa) 
    corrado@corrado-p9-ff-0104-x:~$

  8. #8
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    Re: Kernel 5.5

    Hope Ubuntu releases a signed 5.5 kernel soon. Due to needing to "secure boot" for reasons, I'm currently stuck on 5.4.0-9, which is based on 5.4.3.

    The problem is that 5.4 3 introduced a nasty audio bug (#204477)for those of us using Nvidia GPU's to send audio over HDMI & Bluetooth to our monitor's speakers.

    EDIT: Today's 5.4.0-12 release fixes the issue I described. Also, 5.5 was finally released by Linus.
    Last edited by IanW; January 27th, 2020 at 07:34 PM.
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  9. #9
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    Re: Kernel 5.5

    Also 5.5.2 is released but unfortunately on focal we will have the 5.4 kernel
    https://www.omgubuntu.co.uk/2020/02/...kernel-5-4-lts

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