Page 1 of 2 12 LastLast
Results 1 to 10 of 16

Thread: kernel 5.8.0-50-generic causing display scramble

  1. #1
    Join Date
    Aug 2010
    Beans
    227
    Distro
    Ubuntu 20.04 Focal Fossa

    kernel 5.8.0-50-generic causing display scramble

    After I updated to kernel 5.8.0-50-generic, I started getting severely scrambled displays - missing parts, corrupted text, strobing, blank lines - the works. It was the same for all applications. Then I booted into Windows and found no trace of it. Then I booted into the prior kernel, 5.8.0-49-generic, and again, no problems. I can use that for now, but as soon as the next kernel loads, 5.8.0-49-generic will not be available, at least not directly from the boot menu.

    Anyone else having similar issues?

  2. #2
    Join Date
    Jan 2006
    Location
    Sunny Southend-on-Sea
    Beans
    8,315
    Distro
    Kubuntu 20.04 Focal Fossa

    Re: kernel 5.8.0-50-generic causing display scramble

    I've not experienced the issue, but
    Quote Originally Posted by JamButty View Post
    I can use that for now, but as soon as the next kernel loads, 5.8.0-49-generic will not be available, at least not directly from the boot menu.
    this isn't strictly true. The number of old kernels to keep is a configurable parameter (although I don't know off hand where it's configured), and (temporarily) removing the HWE metapackage will stop you getting any new kernels at all until you know that the bug has been fixed. You should file a bug report, if there isn't one already, detailing the regression. Alternatively, you could go the other way, and try a much newer kernel from the mainline repository to see if the issue has been fixed.

  3. #3
    Join Date
    Jul 2005
    Location
    I think I'm here! Maybe?
    Beans
    Hidden!
    Distro
    Xubuntu 20.04 Focal Fossa

    Re: kernel 5.8.0-50-generic causing display scramble

    Do you have secure boot enabled?
    Are you using an nvidia graphics card which needs a driver installed for the new kernel?

    If so disable secure boot, install the nvidia driver needed and try again. Unfortunately Windows updates can, I gather, re-enable secure boot even if you have disabled it in the past, stopping the necessary modules for the driver being installed properly.

  4. #4
    Join Date
    Aug 2010
    Beans
    227
    Distro
    Ubuntu 20.04 Focal Fossa

    Re: kernel 5.8.0-50-generic causing display scramble

    Thankfully, Ubuntu is not paternalistic like Windoze which shoves updates down your throat with or against your will. I can just decline updates for a while until I see if this is fixed. I seem to remember a few years ago that several ( maybe 5 or 6) kernels used to be offered in the default boot menu.
    I found a couple of pages sort of related, but they explain how to set an old kernel as the default, rather than how to expand the menu choices. Also there are very many articles explaining how to get rid of excess menu choices, so this must have been a problem in the past.
    I get contradictory info on what kernels are available to me.
    One command lists about 22 kernels:
    Code:
    sudo dpkg -l | grep linux-image
    but another indicates there are only two in BOOT
    Code:
    ls /boot/

  5. #5
    Join Date
    Aug 2010
    Beans
    227
    Distro
    Ubuntu 20.04 Focal Fossa

    Re: kernel 5.8.0-50-generic causing display scramble

    ajgreeny - Secure boot IS disabled
    gpu is onboard (Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller)
    Previously, I have never had to dl drivers specific to this.
    Last edited by JamButty; 3 Weeks Ago at 11:38 AM. Reason: better info

  6. #6
    Join Date
    Jan 2006
    Location
    Sunny Southend-on-Sea
    Beans
    8,315
    Distro
    Kubuntu 20.04 Focal Fossa

    Re: kernel 5.8.0-50-generic causing display scramble

    Quote Originally Posted by JamButty View Post
    Also there are very many articles explaining how to get rid of excess menu choices, so this must have been a problem in the past.
    It was. A few releases ago the defaults were to have a smallish EFI partition and to never autoremove kernel packages. Unsurprisingly, as time went on, there were a lot of people with broken systems: the kernel installation couldn't finish because there was no space, so package management was broken, and, in some cases, you couldn't boot because the kernel hadn't finished installing. Nasty. So some versions are kept, but old ones are autoremoved, now.

  7. #7
    Join Date
    May 2013
    Location
    Galiza
    Beans
    4,010
    Distro
    Ubuntu

    Re: kernel 5.8.0-50-generic causing display scramble

    ...a smallish EFI partition
    I think you mean a smallish /boot partition. The ESP stores .efi files, not kernels.

  8. #8
    Join Date
    Jan 2006
    Location
    Sunny Southend-on-Sea
    Beans
    8,315
    Distro
    Kubuntu 20.04 Focal Fossa

    Re: kernel 5.8.0-50-generic causing display scramble

    Quote Originally Posted by CelticWarrior View Post
    I think you mean a smallish /boot partition. The ESP stores .efi files, not kernels.
    Could be. I wasn't affected by it (habitually tidying old kernels after I'd checked the new one works), I just saw the people having the issue in the forum.

  9. #9
    Join Date
    May 2013
    Location
    Galiza
    Beans
    4,010
    Distro
    Ubuntu

    Re: kernel 5.8.0-50-generic causing display scramble

    With LVM+LUKS the installer typically creates a separated /boot partition and the default size used to be very small indeed.
    Normal installations do not have that problem.

  10. #10
    Join Date
    Jun 2010
    Location
    London, England
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: kernel 5.8.0-50-generic causing display scramble

    I can use that for now, but as soon as the next kernel loads, 5.8.0-49-generic will not be available, at least not directly from the boot menu.
    Do not use Software Updater for the time being. Use the terminal.

    Code:
    sudo apt update
    sudo apt upgrade
    When you have confirmed that that any new kernel does not cause problems, then you can run Software Updater and it will want to remove any old kernels. I would wait until at least two new kernels are confirmed as acceptable. Then both the good, older 5.8 kernel and the later, bad 5.8 kernel can be removed.

    Regards
    It is a machine. It is more stupid than we are. It will not stop us from doing stupid things.
    Ubuntu user #33,200. Linux user #530,530


Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •