Keyboard backlight control does not work on some dell laptops.

[Kai-Heng Feng]

[Impact]
There's no sysfs node for some Dell laptop keyboard backlight control.

Two issues here:
1. No sysfs "/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight"
The patch fixes the issue by adding necessary DMI string to dmi whitelist table:

commit 8d2c4538dbc7154c4aed1364db127a0e51dbd459
Author: Alex Hung <email address hidden>
Date: Thu Feb 16 20:58:03 2017 +0800

    platform/x86: dell-laptop: Add Latitude 7480 and others to the DMI whitelist

2. The sysfs exits, but backlight cannot be controlled by "brightness" attribute.
The patch fixes the issue by updating timeout AC, if the model supports it:
commit 9216e0dcb5533a999d544d0af8661118e0588e1d
Author: Pali Rohár <email address hidden>
Date: Sun Apr 23 21:40:47 2017 +0200

    platform/x86: dell-laptop: Add keyboard backlight timeout AC settings

[Test Case]
On Dell Precision 3250 (Kabylake generation), the backlight cannot be controlled in sysfs, because it does not exist.
With these two patches, keyboard backlight can be controlled in "/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight".

[Regression Potential]
The regression potential is low. Only newer Dell laptops will be affected, and it only applies to limited models.

[alex zhang (alex.zhang)]

Hi Heng Feng,
  How many days do you think will be needed to finish this backing port?

[Kai-Heng Feng (kaihengfeng)]

Uh do you mean linux kernel released?

[Kleber Sacilotto de Souza (kleber-souza)]

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-xenial' to 'verification-done-xenial'. If the problem still exists, change the tag 'verification-needed-xenial' to 'verification-failed-xenial'.

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!

[Kleber Sacilotto de Souza (kleber-souza)]

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-yakkety' to 'verification-done-yakkety'. If the problem still exists, change the tag 'verification-needed-yakkety' to 'verification-failed-yakkety'.

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!

[Kleber Sacilotto de Souza (kleber-souza)]

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-zesty' to 'verification-done-zesty'. If the problem still exists, change the tag 'verification-needed-zesty' to 'verification-failed-zesty'.

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!

[Kai-Heng Feng (kaihengfeng)]

I can confirm the brightness can be controlled in sysfs, on all Xenial/Yakkety/Zesty.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.8.0-58.63

---------------
linux (4.8.0-58.63) yakkety; urgency=low

  * linux: 4.8.0-58.63 -proposed tracker (LP: #1700533)

  * CVE-2017-1000364
    - Revert "UBUNTU: SAUCE: mm: Only expand stack if guard area is hit"
    - Revert "mm: do not collapse stack gap into THP"
    - Revert "mm: enlarge stack guard gap"
    - mm: vma_adjust: remove superfluous confusing update in remove_next == 1 case
    - mm: larger stack guard gap, between vmas
    - mm: fix new crash in unmapped_area_topdown()
    - Allow stack to grow up to address space limit

linux (4.8.0-57.62) yakkety; urgency=low

  * linux: 4.8.0-57.62 -proposed tracker (LP: #1699035)

  * CVE-2017-1000364
    - SAUCE: mm: Only expand stack if guard area is hit

  * CVE-2017-7374
    - fscrypt: remove broken support for detecting keyring key revocation

  * CVE-2017-100363
    - char: lp: fix possible integer overflow in lp_setup()

  * CVE-2017-9242
    - ipv6: fix out of bound writes in __ip6_append_data()

  * CVE-2017-9075
    - sctp: do not inherit ipv6_{mc|ac|fl}_list from parent

  * CVE-2017-9074
    - ipv6: Prevent overrun when parsing v6 header options

  * CVE-2017-9076
    - ipv6/dccp: do not inherit ipv6_mc_list from parent

  * CVE-2017-9077
    - ipv6/dccp: do not inherit ipv6_mc_list from parent

  * CVE-2017-8890
    - dccp/tcp: do not inherit mc_list from parent

  * extend-diff-ignore should use exact matches (LP: #1693504)
    - [Packaging] exact extend-diff-ignore matches

  * APST quirk needed for Intel NVMe (LP: #1686592)
    - nvme: Quirk APST on Intel 600P/P3100 devices

  * regression: the 4.8 hwe kernel does not create the
    /sys/block/*/device/enclosure_device:* symlinks (LP: #1691899)
    - scsi: ses: Fix SAS device detection in enclosure

  * datapath: Add missing case OVS_TUNNEL_KEY_ATTR_PAD (LP: #1676679)
    - openvswitch: Add missing case OVS_TUNNEL_KEY_ATTR_PAD

  * connection flood to port 445 on mounting cifs volume under kernel
    (LP: #1686099)
    - cifs: Do not send echoes before Negotiate is complete

  * Support IPMI system interface on Cavium ThunderX (LP: #1688132)
    - i2c: octeon: Rename driver to prepare for split
    - i2c: octeon: Split the driver into two parts
    - [Config] CONFIG_I2C_THUNDERX=m
    - i2c: thunderx: Add i2c driver for ThunderX SOC
    - i2c: thunderx: Add SMBUS alert support
    - i2c: octeon,thunderx: Move register offsets to struct
    - i2c: octeon: Sort include files alphabetically
    - i2c: octeon: Use booleon values for booleon variables
    - i2c: octeon: thunderx: Add MAINTAINERS entry
    - i2c: octeon: Fix set SCL recovery function
    - i2c: octeon: Avoid sending STOP during recovery
    - i2c: octeon: Fix high-level controller status check
    - i2c: octeon: thunderx: TWSI software reset in recovery
    - i2c: octeon: thunderx: Remove double-check after interrupt
    - i2c: octeon: thunderx: Limit register access retries
    - i2c: thunderx: Enable HWMON class probing

  * CVE-2017-5577
    - drm/vc4: Return -EINVAL on the overflow checks failing.

  * Merlin SGMII fail on Ubuntu Xenial HWE kernel (LP: #1686305)
    - net: phy: marvell: fix Marvell 88E1512 u...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.4.0-83.106

---------------
linux (4.4.0-83.106) xenial; urgency=low

  * linux: 4.4.0-83.106 -proposed tracker (LP: #1700541)

  * CVE-2017-1000364
    - Revert "UBUNTU: SAUCE: mm: Only expand stack if guard area is hit"
    - Revert "mm: do not collapse stack gap into THP"
    - Revert "mm: enlarge stack guard gap"
    - mm: vma_adjust: remove superfluous confusing update in remove_next == 1 case
    - mm: larger stack guard gap, between vmas
    - mm: fix new crash in unmapped_area_topdown()
    - Allow stack to grow up to address space limit

linux (4.4.0-82.105) xenial; urgency=low

  * linux: 4.4.0-82.105 -proposed tracker (LP: #1699064)

  * CVE-2017-1000364
    - SAUCE: mm: Only expand stack if guard area is hit

  * linux-aws/linux-gke incorrectly producing and using linux-*-tools-
    common/linux-*-cloud-tools-common (LP: #1688579)
    - [Config] make linux-tools-common and linux-cloud-tools-common protection
      consistent

  * CVE-2017-9242
    - ipv6: fix out of bound writes in __ip6_append_data()

  * CVE-2017-9075
    - sctp: do not inherit ipv6_{mc|ac|fl}_list from parent

  * CVE-2017-9074
    - ipv6: Prevent overrun when parsing v6 header options

  * CVE-2017-9076
    - ipv6/dccp: do not inherit ipv6_mc_list from parent

  * CVE-2017-9077
    - ipv6/dccp: do not inherit ipv6_mc_list from parent

  * CVE-2017-8890
    - dccp/tcp: do not inherit mc_list from parent

  * Module signing exclusion for staging drivers does not work properly
    (LP: #1690908)
    - SAUCE: Fix module signing exclusion in package builds

  * extend-diff-ignore should use exact matches (LP: #1693504)
    - [Packaging] exact extend-diff-ignore matches

  * Dell XPS 9360 wifi 5G performance is poor (LP: #1692836)
    - SAUCE: ath10k: fix the wifi speed issue for kill 1535

  * Upgrade Redpine WLAN/BT driver to ver. 1.2.RC12 (LP: #1694607)
    - SAUCE: Redpine: Upgrade to ver. 1.2.RC12

  * [DP MST] No audio output through HDMI/DP/mDP ports in Dell WD15 and TB15
    docking stations (LP: #1694665)
    - drm/i915: Store port enum in intel_encoder
    - drm/i915: Eliminate redundant local variable definition
    - drm/i915: Switch to using port stored in intel_encoder
    - drm/i915: Move audio_connector to intel_encoder
    - drm/i915/dp: DP audio API changes for MST
    - drm/i915: abstract ddi being audio enabled
    - drm/i915/audio: extend get_saved_enc() to support more scenarios
    - drm/i915: enable dp mst audio

  * Xenial update to 4.4.70 stable release (LP: #1694621)
    - usb: misc: legousbtower: Fix buffers on stack
    - usb: misc: legousbtower: Fix memory leak
    - USB: ene_usb6250: fix DMA to the stack
    - watchdog: pcwd_usb: fix NULL-deref at probe
    - char: lp: fix possible integer overflow in lp_setup()
    - USB: core: replace %p with %pK
    - ARM: tegra: paz00: Mark panel regulator as enabled on boot
    - tpm_crb: check for bad response size
    - infiniband: call ipv6 route lookup via the stub interface
    - dm btree: fix for dm_btree_find_lowest_key()
    - dm raid: select the Kconfig option CONFIG_MD_RAID0
    - dm bufio: avoid a possible ABBA deadlock
    - dm bufio: check ...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.10.0-26.30

---------------
linux (4.10.0-26.30) zesty; urgency=low

  * linux: 4.10.0-26.30 -proposed tracker (LP: #1700528)

  * CVE-2017-1000364
    - Revert "UBUNTU: SAUCE: mm: Only expand stack if guard area is hit"
    - Revert "mm: do not collapse stack gap into THP"
    - Revert "mm: enlarge stack guard gap"
    - mm: larger stack guard gap, between vmas
    - mm: fix new crash in unmapped_area_topdown()
    - Allow stack to grow up to address space limit

linux (4.10.0-25.29) zesty; urgency=low

  * linux: 4.10.0-25.29 -proposed tracker (LP: #1699028)

  * CVE-2017-1000364
    - SAUCE: mm: Only expand stack if guard area is hit

  * CVE-2017-9074
    - ipv6: Prevent overrun when parsing v6 header options
    - ipv6: Check ip6_find_1stfragopt() return value properly.

  * [Zesty] QDF2400 ARM64 server - NMI watchdog: BUG: soft lockup - CPU#8 stuck
    for 22s! (LP: #1680549)
    - iommu/dma: Stop getting dma_32bit_pfn wrong
    - iommu/dma: Implement PCI allocation optimisation
    - iommu/dma: Convert to address-based allocation
    - iommu/dma: Clean up MSI IOVA allocation
    - iommu/dma: Plumb in the per-CPU IOVA caches
    - iommu/iova: Fix underflow bug in __alloc_and_insert_iova_range

  * Zesty update to 4.10.17 stable release (LP: #1692898)
    - xen: adjust early dom0 p2m handling to xen hypervisor behavior
    - target: Fix compare_and_write_callback handling for non GOOD status
    - target/fileio: Fix zero-length READ and WRITE handling
    - iscsi-target: Set session_fall_back_to_erl0 when forcing reinstatement
    - usb: xhci: bInterval quirk for TI TUSB73x0
    - usb: host: xhci: print correct command ring address
    - USB: serial: ftdi_sio: add device ID for Microsemi/Arrow SF2PLUS Dev Kit
    - USB: Proper handling of Race Condition when two USB class drivers try to
      call init_usb_class simultaneously
    - USB: Revert "cdc-wdm: fix "out-of-sync" due to missing notifications"
    - staging: vt6656: use off stack for in buffer USB transfers.
    - staging: vt6656: use off stack for out buffer USB transfers.
    - staging: gdm724x: gdm_mux: fix use-after-free on module unload
    - staging: wilc1000: Fix problem with wrong vif index
    - staging: comedi: jr3_pci: fix possible null pointer dereference
    - staging: comedi: jr3_pci: cope with jiffies wraparound
    - usb: misc: add missing continue in switch
    - usb: gadget: legacy gadgets are optional
    - usb: Make sure usb/phy/of gets built-in
    - usb: hub: Fix error loop seen after hub communication errors
    - usb: hub: Do not attempt to autosuspend disconnected devices
    - x86/boot: Fix BSS corruption/overwrite bug in early x86 kernel startup
    - selftests/x86/ldt_gdt_32: Work around a glibc sigaction() bug
    - x86, pmem: Fix cache flushing for iovec write < 8 bytes
    - um: Fix PTRACE_POKEUSER on x86_64
    - perf/x86: Fix Broadwell-EP DRAM RAPL events
    - KVM: x86: fix user triggerable warning in kvm_apic_accept_events()
    - KVM: arm/arm64: fix races in kvm_psci_vcpu_on
    - arm64: KVM: Fix decoding of Rt/Rt2 when trapping AArch32 CP accesses
    - block: fix blk_integrity_register to use templ...