[Bug 2115068] [NEW] Ubuntu 24.04+ arm64: screen resolution fixed to 1024x768 with last kernel update

[alfredo]

Public bug reported:

Hi,
I have a problem after a kernel update on ubuntu 24.04 arm64. In a few words up to kernel 6.8.11 everything works well and I can change the screen resolution. Starting from kernel 6.8.31 (linux-generic), I cannot do it anymore. I tried manually installing several kernels (for instance 6.8.4-060804-generic) and even linux-generic-hwe (6.11.x).
I did many tests by changing the configuration and following the advice of the mate community https://ubuntu-mate.community/t/ubuntu-mate-24-04-screen-resolution-fixed-to-1024x768-with-last-kernel-update/. However, I came to the conclusions that is something related with ubuntu (gnome or mate is indifferent).
Indeed, I tried with:
Debian 12.11 with kernel 6.1.x and mate desktop: no problem (expected).
Debian 13 daily build with kernel 6.12.x and mate desktop: no problem.
Fedora 42 workstation with kernel 6.14.x and gnome desktop: no problem.
Ubuntu 24.04 server with kernel 6.8.x and 6.11.x: problem (works only up to kernel 6.8.11).
Ubuntu 25.04 with kernel 6.14.x and gnome desktop: problem.

I have to mention that my device SoC, Qualcomm Snapdragon 8cx gen 2, is
the only one in the series (gen 1, gen 3 and gen 4
https://bugzilla.kernel.org/show_bug.cgi?id=218512) that is not
supported by the linux kernel. So the only solution I have found to use
my device is to use hyper-v on windows 11 (virtualbox does not work on
arm on windows
https://www.virtualbox.org/manual/topics/Introduction.html#host-guest-
matrix).

Thank you

** Affects: linux-meta-hwe-6.11 (Ubuntu)
     Importance: Undecided
         Status: New

** Package changed: cryptsetup (Ubuntu) => linux-meta-hwe-6.11 (Ubuntu)

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https://bugs.launchpad.net/bugs/2115068

Title:
  Ubuntu 24.04+ arm64: screen resolution fixed to 1024x768 with last
  kernel update

Status in linux-meta-hwe-6.11 package in Ubuntu:
  New

Bug description:
  Hi,
  I have a problem after a kernel update on ubuntu 24.04 arm64. In a few words up to kernel 6.8.11 everything works well and I can change the screen resolution. Starting from kernel 6.8.31 (linux-generic), I cannot do it anymore. I tried manually installing several kernels (for instance 6.8.4-060804-generic) and even linux-generic-hwe (6.11.x).
  I did many tests by changing the configuration and following the advice of the mate community https://ubuntu-mate.community/t/ubuntu-mate-24-04-screen-resolution-fixed-to-1024x768-with-last-kernel-update/. However, I came to the conclusions that is something related with ubuntu (gnome or mate is indifferent).
  Indeed, I tried with:
  Debian 12.11 with kernel 6.1.x and mate desktop: no problem (expected).
  Debian 13 daily build with kernel 6.12.x and mate desktop: no problem.
  Fedora 42 workstation with kernel 6.14.x and gnome desktop: no problem.
  Ubuntu 24.04 server with kernel 6.8.x and 6.11.x: problem (works only up to kernel 6.8.11).
  Ubuntu 25.04 with kernel 6.14.x and gnome desktop: problem.

  I have to mention that my device SoC, Qualcomm Snapdragon 8cx gen 2,
  is the only one in the series (gen 1, gen 3 and gen 4
  https://bugzilla.kernel.org/show_bug.cgi?id=218512) that is not
  supported by the linux kernel. So the only solution I have found to
  use my device is to use hyper-v on windows 11 (virtualbox does not
  work on arm on windows
  https://www.virtualbox.org/manual/topics/Introduction.html#host-guest-
  matrix).

  Thank you

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