This bug was fixed in the package linux-oem-6.1 - 6.1.0-1017.17
---------------
linux-oem-6.1 (6.1.0-1017.17) jammy; urgency=medium
* jammy/linux-oem-6.1: 6.1.0-1017.17 -proposed tracker (LP: #2026459)
* Packaging resync (LP: #1786013)
- [Packaging] resync update-dkms-versions helper
* CVE-2023-3269
- exec: Remove FOLL_FORCE for stack setup
- mm: introduce new 'lock_mm_and_find_vma()' page fault helper
- mm: make the page fault mmap locking killable
- arm64/mm: Convert to using lock_mm_and_find_vma()
- powerpc/mm: Convert to using lock_mm_and_find_vma()
- mips/mm: Convert to using lock_mm_and_find_vma()
- riscv/mm: Convert to using lock_mm_and_find_vma()
- arm/mm: Convert to using lock_mm_and_find_vma()
- mm/fault: convert remaining simple cases to lock_mm_and_find_vma()
- powerpc/mm: convert coprocessor fault to lock_mm_and_find_vma()
- mm: make find_extend_vma() fail if write lock not held
- execve: expand new process stack manually ahead of time
- mm: always expand the stack with the mmap write lock held
- [CONFIG]: Set CONFIG_LOCK_MM_AND_FIND_VMA
* CVE-2023-3389
- io_uring/poll: serialize poll linked timer start with poll removal
* amd_pmf: AMD 7840HS cpufreq locked at 400-544MHz after power unplugged
(LP: #2025670)
- platform/x86/amd/pmf: Register notify handler only if SPS is enabled
* Mute/mic LEDs no function on some HP Platforms (LP: #2025444)
- ALSA: hda/realtek: Enable mute/micmute LEDs and limit mic boost on
EliteBook
* Various backlight issues with the 6.0/6.1 kernel (LP: #2023638)
- ACPI: video: Stop trying to use vendor backlight control on laptops from
after ~2012
* HDMI output with More than one child device for port B in VBT error
(LP: #2025195)
- SAUCE: drm/i915/quirks: Add multiple VBT quirk for HP ZBook Power G10
-- You-Sheng Yang <vicamo.y...@canonical.com> Wed, 12 Jul 2023
11:26:03 +0800
** Changed in: linux-oem-6.1 (Ubuntu Jammy)
Status: Fix Committed => Fix Released
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2023-3269
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2023-3389
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https://bugs.launchpad.net/bugs/2023638
Title:
Various backlight issues with the 6.0/6.1 kernel
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-6.0 package in Ubuntu:
Invalid
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.0 source package in Jammy:
Fix Released
Status in linux-oem-6.1 source package in Jammy:
Fix Released
Status in linux source package in Kinetic:
Invalid
Status in linux-oem-6.0 source package in Kinetic:
Invalid
Status in linux-oem-6.1 source package in Kinetic:
Invalid
Status in linux source package in Lunar:
In Progress
Status in linux-oem-6.0 source package in Lunar:
Invalid
Status in linux-oem-6.1 source package in Lunar:
Invalid
Status in linux source package in Mantic:
In Progress
Status in linux-oem-6.0 source package in Mantic:
Invalid
Status in linux-oem-6.1 source package in Mantic:
Invalid
Bug description:
[Impact]
There are some new patches for new method to decide which backlight driver
should be registered introduced since 6.1. And we backport some of them to
6.0-oem kernel which are not enough to solved all backlight issues.
1. dell_laptop created a non-working backlight driver before nvidia is
loaded, that leads to the system can't adjust the display brightness.
2. acpi_backlight0 sometimes will be generated together with intel_backlight.
[Fix]
Below 2 commits from v6.3-rc6 prevent the acpi_backlight from being
registered automatically(which have been included into ubuntu kernels through
stable update)
e506731c8f35 ACPI: video: Make acpi_backlight=video work independent from GPU
driver
78dfc9d1d1ab ACPI: video: Add auto_detect arg to
__acpi_video_get_backlight_type()
Below patch prevents platform driver(dell_laptop) from creating backlight
driver after win8.
aa8a950a5d6b ACPI: video: Stop trying to use vendor backlight control on
laptops from after ~2012
https://patchwork.kernel.org/project/linux-acpi/patch/20230608091258.7963-1-hdego...@redhat.com/
[Test]
Verified on the dell platform which reports this issue.
[Where problems could occur]
The assumption of the not-yet-upstreamed commit regarding backlight control
is that, after Windows 8, all laptop backlights are controlled either by ACPI
or the native graphics driver. It impacts the laptops that do not follow the
assumption and will lead to broken backlight interface.
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