Make backlight module auto detect dell_uart_backlight

This bug is awaiting verification that the linux-oem-6.1/6.1.0-1008.8 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-jammy' to 'verification-done-jammy'. If the problem still exists, change the tag 'verification-needed-jammy' to 'verification-failed-jammy'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

After upgrading Ubuntu to `Lunar Lobster`, I couldn't adjust the brightness of my laptop under `Software Rendering` now😥.

Hi Larry,

You have to wait the new kernel for Lunar, should be available soon.
The OEM kernel is in -proposed(6.1.0-1008.8-oem) now which contains the fix if you want to try.

Verified the backlight interface is correct with 6.1.0-1008-oem.

Hopeful! My screen is much bright and I have to stop my job!

This bug was fixed in the package linux-oem-6.1 - 6.1.0-1008.8

---------------
linux-oem-6.1 (6.1.0-1008.8) jammy; urgency=medium

  * jammy/linux-oem-6.1: 6.1.0-1008.8 -proposed tracker (LP: #2008352)

  * overlayfs mounts as R/O over idmapped mount (LP: #2009065)
    - SAUCE: overlayfs: handle idmapped mounts in ovl_do_(set|remove)xattr

  * Some QHD panels fail to refresh when PSR2 enabled (LP: #2009014)
    - SAUCE: drm/i915/psr: Use calculated io and fast wake lines

  * Fix mediatek wifi driver crash when loading wrong SAR table (LP: #2009118)
    - wifi: mt76: mt7921: fix error code of return in mt7921_acpi_read

  * Packaging resync (LP: #1786013)
    - [Packaging] update update.conf

  * Update dg2_dmc to 2.08 (LP: #1999375)
    - drm/i915/dmc: Update DG2 DMC version to v2.08

  * New DG2 workarounds (LP: #2006945)
    - drm/i915/dg2: Introduce Wa_18017747507
    - drm/i915/dg2: Introduce Wa_18018764978
    - drm/i915/dg2: Introduce Wa_18019271663

  * Screen backlight keeps in minimized and can't change it with amdgpu
    (LP: #2008871)
    - SAUCE: ACPI: video: Add backlight=native DMI quirk for Dell Vostro 15 3535

  * Remove all other acpi_video backlight interface on Dell AIO platforms
    (LP: #2008882)
    - SAUCE: ACPI: video: Dell AIO UART backlight detection

  * screen flicker after PSR2 enabled (LP: #2007516)
    - SAUCE: drm/i915/display/psr: Disable PSR2 sel fetch on panel SHP 5457

  * rtcpie in timers from ubuntu_kernel_selftests randomly failing
    (LP: #1814234)
    - SAUCE: selftest: rtcpie: Force passing unreliable subtest

  * Fix HFP mSBC support on Realtek Bluetooth USB controller (LP: #2007331)
    - Bluetooth: btrtl: Add btrealtek data struct
    - Bluetooth: btusb: Ignore zero length of USB packets on ALT 6 for specific
      chip

  * Jammy update: v6.1.14 upstream stable release (LP: #2008708)
    - drm/etnaviv: don't truncate physical page address
    - wifi: ath11k: fix warning in dma_free_coherent() of memory chunks while
      recovery
    - wifi: rtl8xxxu: gen2: Turn on the rate control
    - drm/edid: Fix minimum bpc supported with DSC1.2 for HDMI sink
    - clk: mxl: Switch from direct readl/writel based IO to regmap based IO
    - clk: mxl: Remove redundant spinlocks
    - clk: mxl: Add option to override gate clks
    - clk: mxl: Fix a clk entry by adding relevant flags
    - powerpc: dts: t208x: Mark MAC1 and MAC2 as 10G
    - clk: mxl: syscon_node_to_regmap() returns error pointers
    - sched/psi: Stop relying on timer_pending() for poll_work rescheduling
    - random: always mix cycle counter in add_latent_entropy()
    - scsi: libsas: Add smp_ata_check_ready_type()
    - scsi: hisi_sas: Fix SATA devices missing issue during I_T nexus reset
    - spi: mediatek: Enable irq when pdata is ready
    - docs: perf: Fix PMU instance name of hisi-pcie-pmu
    - KVM: x86: Fail emulation during EMULTYPE_SKIP on any exception
    - KVM: SVM: Skip WRMSR fastpath on VM-Exit if next RIP isn't valid
    - KVM: VMX: Execute IBPB on emulated VM-exit when guest has IBRS
    - can: kvaser_usb: hydra: help gcc-13 to figure out cmd_len
    - powerpc: dts: t208x: Disable 10G on MAC1 and MAC2
    - spi: mediatek: ...

This bug was fixed in the package linux-oem-6.5 - 6.5.0-1004.4

---------------
linux-oem-6.5 (6.5.0-1004.4) jammy; urgency=medium

  * jammy/linux-oem-6.5: 6.5.0-1004.4 -proposed tracker (LP: #2036238)

  * Infiniate systemd loop when power off the machine with multiple MD RAIDs
    (LP: #2036184)
    - SAUCE: md: do not _put wrong device in md_seq_next

  * dell-uart-backlight fails to communicate with the scalar IC somtimes.
    (LP: #2035299)
    - SAUCE: platform/x86: dell-uart-backlight: add small delay after write
      command

  [ Ubuntu: 6.5.0-6.6 ]

  * mantic/linux: 6.5.0-6.6 -proposed tracker (LP: #2035595)
  * Mantic update: v6.5.3 upstream stable release (LP: #2035588)
    - drm/amd/display: ensure async flips are only accepted for fast updates
    - cpufreq: intel_pstate: set stale CPU frequency to minimum
    - tpm: Enable hwrng only for Pluton on AMD CPUs
    - Input: i8042 - add quirk for TUXEDO Gemini 17 Gen1/Clevo PD70PN
    - Revert "fuse: in fuse_flush only wait if someone wants the return code"
    - Revert "f2fs: clean up w/ sbi->log_sectors_per_block"
    - Revert "PCI: tegra194: Enable support for 256 Byte payload"
    - Revert "net: macsec: preserve ingress frame ordering"
    - reiserfs: Check the return value from __getblk()
    - splice: always fsnotify_access(in), fsnotify_modify(out) on success
    - splice: fsnotify_access(fd)/fsnotify_modify(fd) in vmsplice
    - splice: fsnotify_access(in), fsnotify_modify(out) on success in tee
    - eventfd: prevent underflow for eventfd semaphores
    - fs: Fix error checking for d_hash_and_lookup()
    - iomap: Remove large folio handling in iomap_invalidate_folio()
    - tmpfs: verify {g,u}id mount options correctly
    - selftests/harness: Actually report SKIP for signal tests
    - vfs, security: Fix automount superblock LSM init problem, preventing NFS sb
      sharing
    - ARM: ptrace: Restore syscall restart tracing
    - ARM: ptrace: Restore syscall skipping for tracers
    - btrfs: zoned: skip splitting and logical rewriting on pre-alloc write
    - erofs: release ztailpacking pclusters properly
    - locking/arch: Avoid variable shadowing in local_try_cmpxchg()
    - refscale: Fix uninitalized use of wait_queue_head_t
    - clocksource: Handle negative skews in "skew is too large" messages
    - powercap: arm_scmi: Remove recursion while parsing zones
    - OPP: Fix potential null ptr dereference in dev_pm_opp_get_required_pstate()
    - OPP: Fix passing 0 to PTR_ERR in _opp_attach_genpd()
    - selftests/resctrl: Add resctrl.h into build deps
    - selftests/resctrl: Don't leak buffer in fill_cache()
    - selftests/resctrl: Unmount resctrl FS if child fails to run benchmark
    - selftests/resctrl: Close perf value read fd on errors
    - sched/fair: remove util_est boosting
    - arm64/ptrace: Clean up error handling path in sve_set_common()
    - sched/psi: Select KERNFS as needed
    - cpuidle: teo: Update idle duration estimate when choosing shallower state
    - x86/decompressor: Don't rely on upper 32 bits of GPRs being preserved
    - arm64/fpsimd: Only provide the length to cpufeature for xCR registers
    - sched/rt: Fix sysctl_sched_rr_timeslice in...

This bug was fixed in the package linux - 6.5.0-7.7

---------------
linux (6.5.0-7.7) mantic; urgency=medium

  * mantic/linux: 6.5.0-7.7 -proposed tracker (LP: #2037611)

  * kexec enable to load/kdump zstd compressed zimg (LP: #2037398)
    - [Packaging] Revert arm64 image format to Image.gz

  * Mantic minimized/minimal cloud images do not receive IP address during
    provisioning (LP: #2036968)
    - [Config] Enable virtio-net as built-in to avoid race

  * Miscellaneous Ubuntu changes
    - SAUCE: Add mdev_set_iommu_device() kABI
    - [Config] update gcc version in annotations

 -- Andrea Righi <email address hidden> Thu, 28 Sep 2023 10:19:24 +0200

This bug is awaiting verification that the linux-azure-6.5/6.5.0-1007.7~22.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-jammy-linux-azure-6.5' to 'verification-done-jammy-linux-azure-6.5'. If the problem still exists, change the tag 'verification-needed-jammy-linux-azure-6.5' to 'verification-failed-jammy-linux-azure-6.5'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

This bug is awaiting verification that the linux-aws-6.5/6.5.0-1008.8~22.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-jammy-linux-aws-6.5' to 'verification-done-jammy-linux-aws-6.5'. If the problem still exists, change the tag 'verification-needed-jammy-linux-aws-6.5' to 'verification-failed-jammy-linux-aws-6.5'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!