Please make CONFIG_PWM_LPSS_PCI and CONFIG_PWM_LPSS_PLATFORM built in to make brightness adjustment working on various BayTrail/CherryTrail-based devices

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1783964

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Upstream bugreport with more details: https://bugs.freedesktop.org/show_bug.cgi?id=96571

This bug was fixed in the package linux - 4.18.0-9.10

---------------
linux (4.18.0-9.10) cosmic; urgency=medium

  * linux: 4.18.0-9.10 -proposed tracker (LP: #1796346)

  * Cosmic update: v4.18.12 upstream stable release (LP: #1796139)
    - crypto: skcipher - Fix -Wstringop-truncation warnings
    - iio: adc: ina2xx: avoid kthread_stop() with stale task_struct
    - tsl2550: fix lux1_input error in low light
    - misc: ibmvmc: Use GFP_ATOMIC under spin lock
    - vmci: type promotion bug in qp_host_get_user_memory()
    - siox: don't create a thread without starting it
    - x86/numa_emulation: Fix emulated-to-physical node mapping
    - staging: rts5208: fix missing error check on call to rtsx_write_register
    - power: supply: axp288_charger: Fix initial constant_charge_current value
    - misc: sram: enable clock before registering regions
    - serial: sh-sci: Stop RX FIFO timer during port shutdown
    - uwb: hwa-rc: fix memory leak at probe
    - power: vexpress: fix corruption in notifier registration
    - iommu/amd: make sure TLB to be flushed before IOVA freed
    - Bluetooth: Add a new Realtek 8723DE ID 0bda:b009
    - USB: serial: kobil_sct: fix modem-status error handling
    - 6lowpan: iphc: reset mac_header after decompress to fix panic
    - iommu/msm: Don't call iommu_device_{,un}link from atomic context
    - s390/mm: correct allocate_pgste proc_handler callback
    - power: remove possible deadlock when unregistering power_supply
    - drm/amd/display/dc/dce: Fix multiple potential integer overflows
    - drm/amd/display: fix use of uninitialized memory
    - md-cluster: clear another node's suspend_area after the copy is finished
    - cxgb4: Fix the condition to check if the card is T5
    - RDMA/bnxt_re: Fix a couple off by one bugs
    - RDMA/i40w: Hold read semaphore while looking after VMA
    - RDMA/bnxt_re: Fix a bunch of off by one bugs in qplib_fp.c
    - IB/core: type promotion bug in rdma_rw_init_one_mr()
    - media: exynos4-is: Prevent NULL pointer dereference in __isp_video_try_fmt()
    - IB/mlx4: Test port number before querying type.
    - powerpc/kdump: Handle crashkernel memory reservation failure
    - media: fsl-viu: fix error handling in viu_of_probe()
    - vhost_net: Avoid tx vring kicks during busyloop
    - media: staging/imx: fill vb2_v4l2_buffer field entry
    - IB/mlx5: Fix GRE flow specification
    - include/rdma/opa_addr.h: Fix an endianness issue
    - x86/tsc: Add missing header to tsc_msr.c
    - ARM: hwmod: RTC: Don't assume lock/unlock will be called with irq enabled
    - x86/entry/64: Add two more instruction suffixes
    - ARM: dts: ls1021a: Add missing cooling device properties for CPUs
    - scsi: target/iscsi: Make iscsit_ta_authentication() respect the output
      buffer size
    - thermal: i.MX: Allow thermal probe to fail gracefully in case of bad
      calibration.
    - scsi: klist: Make it safe to use klists in atomic context
    - scsi: ibmvscsi: Improve strings handling
    - scsi: target: Avoid that EXTENDED COPY commands trigger lock inversion
    - usb: wusbcore: security: cast sizeof to int for comparison
    - ath10k: sdio: use same endpoint id for all packets...

Hello guys,

I'm kind of new regarding kernel patching. I've Asus T102HA and saw some other blogs about how to control the backlight brightness. I tried to message to people and asked for help but I got no response. Would you guys help me how to fix the backlight brightness step by step? Currently, I tried to install linux mint 19 mate edition and Crunchbangplusplus versions. Both are working but couldn't set the brightness to lower setting.

Thank you.

This bug is awaiting verification that the 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-bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed-bionic'.

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 was erroneously marked for verification in bionic; verification is not required and verification-needed-bionic is being removed.

This is somewhat off topic, but the fix in the description remains useful and is required to enable backlight brightness adjustment for the HP Stream 7 when running Debian 11 (Linux 5.10).

Example steps (to be run in an i386 environment, such as a debootstrap chroot jail):

apt install fakeroot devscripts
apt build-dep linux
apt source linux
cd linux-5.10.84/ # Change as needed
nano debian/config/kernelarch-x86/config
# Make the kernel configuration changes as in the description
debuild -b -uc -us
# Install linux-image-5.10.0-10-686-unsigned_5.10.84-1_i386.deb