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[Bug 1667323] Re: Backlight control does not work and there are no entries in /sys/class/backlight

 

This bug was fixed in the package linux - 4.4.0-78.99

---------------
linux (4.4.0-78.99) xenial; urgency=low

  * linux: 4.4.0-78.99 -proposed tracker (LP: #1686645)

  * Please backport fix to reference leak in cgroup blkio throttle
    (LP: #1683976)
    - block: fix module reference leak on put_disk() call for cgroups throttle

  * UbuntuKVM guest crashed while running I/O stress test with Ubuntu kernel
    4.4.0-47-generic (LP: #1659111)
    - block: Unhash block device inodes on gendisk destruction
    - block: Use pointer to backing_dev_info from request_queue
    - block: Dynamically allocate and refcount backing_dev_info
    - block: Make blk_get_backing_dev_info() safe without open bdev
    - block: Get rid of blk_get_backing_dev_info()
    - block: Move bdev_unhash_inode() after invalidate_partition()
    - block: Unhash also block device inode for the whole device
    - block: Revalidate i_bdev reference in bd_aquire()
    - block: Initialize bd_bdi on inode initialization
    - block: Move bdi_unregister() to del_gendisk()
    - block: Allow bdi re-registration
    - bdi: Fix use-after-free in wb_congested_put()
    - block: Make del_gendisk() safer for disks without queues
    - block: Fix bdi assignment to bdev inode when racing with disk delete
    - bdi: Mark congested->bdi as internal
    - bdi: Make wb->bdi a proper reference
    - bdi: Unify bdi->wb_list handling for root wb_writeback
    - bdi: Shutdown writeback on all cgwbs in cgwb_bdi_destroy()
    - bdi: Do not wait for cgwbs release in bdi_unregister()
    - bdi: Rename cgwb_bdi_destroy() to cgwb_bdi_unregister()
    - block: Fix oops in locked_inode_to_wb_and_lock_list()
    - kobject: Export kobject_get_unless_zero()
    - block: Fix oops scsi_disk_get()

  * Touchpad not working correctly after kernel upgrade (LP: #1662589)
    - Input: ALPS - fix V8+ protocol handling (73 03 28)

  * Xenial update to v4.4.62 stable release (LP: #1683728)
    - drm/i915: Avoid tweaking evaluation thresholds on Baytrail v3
    - drm/i915: Stop using RP_DOWN_EI on Baytrail
    - usb: dwc3: gadget: delay unmap of bounced requests
    - mtd: bcm47xxpart: fix parsing first block after aligned TRX
    - MIPS: Introduce irq_stack
    - MIPS: Stack unwinding while on IRQ stack
    - MIPS: Only change $28 to thread_info if coming from user mode
    - MIPS: Switch to the irq_stack in interrupts
    - MIPS: Select HAVE_IRQ_EXIT_ON_IRQ_STACK
    - MIPS: IRQ Stack: Fix erroneous jal to plat_irq_dispatch
    - crypto: caam - fix RNG deinstantiation error checking
    - Linux 4.4.62

  * ifup service of network device stay active after driver stop (LP: #1672144)
    - net: use net->count to check whether a netns is alive or not

  * [Hyper-V] mkfs regression in kernel 4.4+ (LP: #1682215)
    - block: relax check on sg gap

  * [Feature] KBL: intel_powerclamp driver support (LP: #1591641)
    - thermal/powerclamp: remove cpu whitelist
    - thermal/powerclamp: correct cpu support check
    - thermal/powerclamp: add back module device table

  * sysfs channel reads of lps22hb pressure sensor are stale (LP: #1682103)
    - iio: st_pressure: initialize lps22hb bootime

  * Backlight control does not work and there are no entries in
    /sys/class/backlight (LP: #1667323)
    - Revert "ACPI / video: Add force_native quirk for HP Pavilion dv6"

  * [Feature] KBL: intel_rapl driver support (LP: #1591640)
    - powercap/intel_rapl: Add support for Kabylake

  * Xenial update to v4.4.61 stable release (LP: #1682140)
    - drm/vmwgfx: Type-check lookups of fence objects
    - drm/vmwgfx: NULL pointer dereference in vmw_surface_define_ioctl()
    - drm/vmwgfx: avoid calling vzalloc with a 0 size in vmw_get_cap_3d_ioctl()
    - drm/ttm, drm/vmwgfx: Relax permission checking when opening surfaces
    - drm/vmwgfx: Remove getparam error message
    - drm/vmwgfx: fix integer overflow in vmw_surface_define_ioctl()
    - sysfs: be careful of error returns from ops->show()
    - staging: android: ashmem: lseek failed due to no FMODE_LSEEK.
    - arm/arm64: KVM: Take mmap_sem in stage2_unmap_vm
    - arm/arm64: KVM: Take mmap_sem in kvm_arch_prepare_memory_region
    - iio: bmg160: reset chip when probing
    - Reset TreeId to zero on SMB2 TREE_CONNECT
    - ptrace: fix PTRACE_LISTEN race corrupting task->state
    - ring-buffer: Fix return value check in test_ringbuffer()
    - metag/usercopy: Drop unused macros
    - metag/usercopy: Fix alignment error checking
    - metag/usercopy: Add early abort to copy_to_user
    - metag/usercopy: Zero rest of buffer from copy_from_user
    - metag/usercopy: Set flags before ADDZ
    - metag/usercopy: Fix src fixup in from user rapf loops
    - metag/usercopy: Add missing fixups
    - powerpc/mm: Add missing global TLB invalidate if cxl is active
    - powerpc: Don't try to fix up misaligned load-with-reservation instructions
    - nios2: reserve boot memory for device tree
    - s390/decompressor: fix initrd corruption caused by bss clear
    - s390/uaccess: get_user() should zero on failure (again)
    - MIPS: Force o32 fp64 support on 32bit MIPS64r6 kernels
    - MIPS: ralink: Fix typos in rt3883 pinctrl
    - MIPS: End spinlocks with .insn
    - MIPS: Lantiq: fix missing xbar kernel panic
    - MIPS: Flush wrong invalid FTLB entry for huge page
    - mm/mempolicy.c: fix error handling in set_mempolicy and mbind.
    - Linux 4.4.61

  * Xenial update to v4.4.60 stable release (LP: #1681862)
    - libceph: force GFP_NOIO for socket allocations
    - xen/setup: Don't relocate p2m over existing one
    - scsi: mpt3sas: fix hang on ata passthrough commands
    - scsi: sg: check length passed to SG_NEXT_CMD_LEN
    - scsi: libsas: fix ata xfer length
    - ALSA: seq: Fix race during FIFO resize
    - ALSA: hda - fix a problem for lineout on a Dell AIO machine
    - ASoC: atmel-classd: fix audio clock rate
    - ACPI: Fix incompatibility with mcount-based function graph tracing
    - ACPI: Do not create a platform_device for IOAPIC/IOxAPIC
    - tty/serial: atmel: fix race condition (TX+DMA)
    - tty/serial: atmel: fix TX path in atmel_console_write()
    - USB: fix linked-list corruption in rh_call_control()
    - KVM: x86: clear bus pointer when destroyed
    - drm/radeon: Override fpfn for all VRAM placements in radeon_evict_flags
    - mm, hugetlb: use pte_present() instead of pmd_present() in follow_huge_pmd()
    - MIPS: Lantiq: Fix cascaded IRQ setup
    - rtc: s35390a: fix reading out alarm
    - rtc: s35390a: make sure all members in the output are set
    - rtc: s35390a: implement reset routine as suggested by the reference
    - rtc: s35390a: improve irq handling
    - KVM: kvm_io_bus_unregister_dev() should never fail
    - power: reset: at91-poweroff: timely shutdown LPDDR memories
    - blk: improve order of bio handling in generic_make_request()
    - blk: Ensure users for current->bio_list can see the full list.
    - padata: avoid race in reordering
    - Linux 4.4.60

 -- Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>  Thu, 27 Apr
2017 10:24:08 -0300

** Changed in: linux (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1667323

Title:
  Backlight control does not work and there are no entries in
  /sys/class/backlight

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Fix Released

Bug description:
  It was working fine until today. 
  The folder /sys/class/backlight/ use to have "acpi_video0/brightness", but now is empty. 
  I am using Nvidia Proprietary driver 340.101 (proprietary, tested). The problem persists even with the 304 driver.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-64-generic 4.4.0-64.85
  ProcVersionSignature: Ubuntu 4.4.0-64.85-generic 4.4.44
  Uname: Linux 4.4.0-64-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  desgua     2028 F.... pulseaudio
   /dev/snd/controlC0:  desgua     2028 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Feb 23 11:31:18 2017
  HibernationDevice: RESUME=UUID=f23a6347-9483-460e-aa29-cbc47850f890
  InstallationDate: Installed on 2014-05-01 (1028 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  Lsusb:
   Bus 002 Device 003: ID 064e:a127 Suyin Corp. 
   Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Hewlett-Packard HP Pavilion dv6 Notebook PC
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-64-generic root=/dev/mapper/ubuntu--vg-root ro
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-64-generic N/A
   linux-backports-modules-4.4.0-64-generic  N/A
   linux-firmware                            1.157.8
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-08-17 (189 days ago)
  dmi.bios.date: 12/03/2009
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.13
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 3659
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 32.23
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnHewlett-Packard:bvrF.13:bd12/03/2009:svnHewlett-Packard:pnHPPaviliondv6NotebookPC:pvr049D210000241210000020000:rvnHewlett-Packard:rn3659:rvr32.23:cvnHewlett-Packard:ct10:cvrN/A:
  dmi.product.name: HP Pavilion dv6 Notebook PC
  dmi.product.version: 049D210000241210000020000
  dmi.sys.vendor: Hewlett-Packard

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