Colour banding in Lenovo G50-80 laptop display (i915)

[Kostas Papadopoulos]

Colour bandind is visible everywhere in the system. I believe it's not a hardware problem, since booting with 'nomodeset' works as expected and the previously installed Ubuntu 14.04 also worked.

I tried installing kernel 4.18.0-16.17 from ppa:canonical-kernel-team/ppa but the problem remained.

There were already similar bugs, https://bugs.launchpad.net/bugs/1749420 , https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1794387 and https://bugs.launchpad.net/bugs/1788308, but the fixes provided for those bugs did not work for my specific monitor.

cat /proc/version_signature
Ubuntu 4.15.0-46.49-generic 4.15.18

sudo lspci -vnvn
00:00.0 Host bridge [0600]: Intel Corporation Haswell-ULT DRAM Controller [8086:0a04] (rev 0b)
 Subsystem: Lenovo Haswell-ULT DRAM Controller [17aa:390b]
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
 Latency: 0
 Capabilities: [e0] Vendor Specific Information: Len=0c <?>
 Kernel driver in use: hsw_uncore

00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
 Subsystem: Lenovo Haswell-ULT Integrated Graphics Controller [17aa:390b]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 46
 Region 0: Memory at b0000000 (64-bit, non-prefetchable) [size=4M]
 Region 2: Memory at a0000000 (64-bit, prefetchable) [size=256M]
 Region 4: I/O ports at 4000 [size=64]
 [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
 Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
  Address: fee02004 Data: 4023
 Capabilities: [d0] Power Management version 2
  Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
  Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [a4] PCI Advanced Features
  AFCap: TP+ FLR+
  AFCtrl: FLR-
  AFStatus: TP-
 Kernel driver in use: i915
 Kernel modules: i915

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

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 1819968

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.

[Kostas Papadopoulos (kpu)]

Probably related:

https://patchwork.kernel.org/patch/9716467/

Since the introduction of kernel 4.8 I've been experiencing color
banding on my Lenovo G50-80 notebook. I also had reports of the same
symptoms on the G50-70 model.

I figured out that the problem had been introduced by commit
210a021dab639694600450c14b877bf3e3240adc

The G50-80's LCD panel supports 6bpc, but is now set to 8bpc,
and the system probably falls back to 6bpc
without any dithering, which result in heavily banded gradients.

I fixed it for myself by adding an EDID quirk for that particular LCD
panel (see the attached patch). It's unknown to me, however, if there
are any other panels affected by the issue, so maybe a more general
solution might be desirable.

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index fad3d44e4642..ee3124bcae87 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -147,6 +147,9 @@ static const struct edid_quirk {
  /* Medion MD 30217 PG */
  { "MED", 0x7b8, EDID_QUIRK_PREFER_LARGE_75 },

+ /* Fix for Lenovo G50 */
+ { "SDC", 18514, EDID_QUIRK_FORCE_6BPC },
+
  /* Panel in Samsung NP700G7A-S01PL notebook reports 6bpc */
  { "SEC", 0xd033, EDID_QUIRK_FORCE_8BPC },

[Kostas Papadopoulos (kpu)]

$ xrandr --props
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 32767 x 32767
VGA1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 410mm x 230mm
        EDID:
                00ffffffffffff001e6d094c07230800
                071601036c291778ead025a258559c28
                0f5054a76a00314f454f614f81c00101
                010101010101662156aa51001e30468f
                33009ae61000001e000000fd00384b1e
                3d09000a202020202020000000fc0045
                313934320a20202020202020000000ff
                003230374e444e5546503235350a005e
   1366x768 59.79*+
   1280x720 59.97 +
   1024x768 75.08 75.03 60.00
   832x624 74.55
   800x600 75.00 60.32 56.25
   640x480 75.00 60.00
   720x400 70.08
HDMI1 disconnected (normal left inverted right x axis y axis)
        Broadcast RGB: Automatic
                supported: Automatic, Full, Limited 16:235
        audio: auto
                supported: force-dvi, off, auto, on
DP1 disconnected (normal left inverted right x axis y axis)
        Broadcast RGB: Automatic
                supported: Automatic, Full, Limited 16:235
        audio: auto
                supported: force-dvi, off, auto, on
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

$ find /sys/devices/ |fgrep -i edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-1/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-1/edid

$ xxd /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-1/edid
$ xxd /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/edid
00000000: 00ff ffff ffff ff00 4c83 5248 0000 0000 ........L.RH....
00000010: 0018 0103 9522 1378 0a71 0593 5557 8f29 .....".x.q..UW.)
00000020: 2050 5400 0000 0101 0101 0101 0101 0101 PT.............
00000030: 0101 0101 0101 411c 56a0 5000 1630 3020 ......A.V.P..00
00000040: 2500 58c2 1000 0019 0000 000f 0000 0000 %.X.............
00000050: 0000 0000 0020 5203 1500 0000 00fe 0053 ..... R........S
00000060: 414d 5355 4e47 0a20 4c83 4154 0000 00fe AMSUNG. L.AT....
00000070: 004c 544e 3135 3641 5433 374c 3032 00db .LTN156AT37L02..
$ xxd /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2/edid
$ xxd /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-1/edid
$

[Kai-Heng Feng (kaihengfeng)]

Please send a patch to upstream.
Also, 18514 should change to a hex value.

[Kostas Papadopoulos (kpu)]

Thank you for your quick response!

This regression / bug was found out almost 2 YEARS ago:
https://bbs.archlinux.org/viewtopic.php?id=225215
and a patch was sent to upstream (see post #2), but apparently it was never pulled.

Regarding hex vs dec, the file in master they seem to be mixing both:
https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/drm_edid.c

The product id number for a specific panel is found in Xorg.log:
fgrep EDID /var/log/Xorg.0.log
[ 751.496] (II) modeset(0): EDID vendor "SDC", prod id 18514

Anyway, I am hoping that Ubuntu, which has the biggest base of desktop Linux users (and in particular of people who may have bought laptops without pre-installed Windows, like Lenovo G50-80 and G50-70), would choose to fix this regression for Ubuntu users.

[Kai-Heng Feng (kaihengfeng)]

I didn't find any indication that the patch was sent to upstream in the archlinux link.
How about sending the patch yourself? It can be fun ;)

[Kostas Papadopoulos (kpu)]

Since I am not familiar with the procedure of submitting patches upstream, I am hoping that you'll do it for the Lenovo G50 models, like you did it e.g. for the HP Pavilion a few months ago :-)

https://lkml.org/lkml/2018/10/2/1237

Thank you in advance!

[Kai-Heng Feng (kaihengfeng)]

https://lkml.org/lkml/2019/4/1/1633

[Alexandru Cosmin (leppermessiah)]

Hi,
I keep trying all kinds of solutions found on the web to fix this but the banding stays on for me? Am I doing something wrong? Is there a method to manually specify the BPP?

Thanks

[Kai-Heng Feng (kaihengfeng)]

Alexandru,

Is system the same? If it's not then please file a separate bug.

[Alexandru Cosmin (leppermessiah)]

Exactly the same.

[Alexandru Cosmin (leppermessiah)]

I've just installed 5.3.7 and the problem persists.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

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

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!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

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!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

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!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.3.0-24.26

---------------
linux (5.3.0-24.26) eoan; urgency=medium

  * eoan/linux: 5.3.0-24.26 -proposed tracker (LP: #1852232)

  * Eoan update: 5.3.9 upstream stable release (LP: #1851550)
    - io_uring: fix up O_NONBLOCK handling for sockets
    - dm snapshot: introduce account_start_copy() and account_end_copy()
    - dm snapshot: rework COW throttling to fix deadlock
    - Btrfs: fix inode cache block reserve leak on failure to allocate data space
    - btrfs: qgroup: Always free PREALLOC META reserve in
      btrfs_delalloc_release_extents()
    - iio: adc: meson_saradc: Fix memory allocation order
    - iio: fix center temperature of bmc150-accel-core
    - libsubcmd: Make _FORTIFY_SOURCE defines dependent on the feature
    - perf tests: Avoid raising SEGV using an obvious NULL dereference
    - perf map: Fix overlapped map handling
    - perf script brstackinsn: Fix recovery from LBR/binary mismatch
    - perf jevents: Fix period for Intel fixed counters
    - perf tools: Propagate get_cpuid() error
    - perf annotate: Propagate perf_env__arch() error
    - perf annotate: Fix the signedness of failure returns
    - perf annotate: Propagate the symbol__annotate() error return
    - perf annotate: Fix arch specific ->init() failure errors
    - perf annotate: Return appropriate error code for allocation failures
    - perf annotate: Don't return -1 for error when doing BPF disassembly
    - staging: rtl8188eu: fix null dereference when kzalloc fails
    - RDMA/siw: Fix serialization issue in write_space()
    - RDMA/hfi1: Prevent memory leak in sdma_init
    - RDMA/iw_cxgb4: fix SRQ access from dump_qp()
    - RDMA/iwcm: Fix a lock inversion issue
    - HID: hyperv: Use in-place iterator API in the channel callback
    - kselftest: exclude failed TARGETS from runlist
    - selftests/kselftest/runner.sh: Add 45 second timeout per test
    - nfs: Fix nfsi->nrequests count error on nfs_inode_remove_request
    - arm64: cpufeature: Effectively expose FRINT capability to userspace
    - arm64: Fix incorrect irqflag restore for priority masking for compat
    - arm64: ftrace: Ensure synchronisation in PLT setup for Neoverse-N1 #1542419
    - tty: serial: owl: Fix the link time qualifier of 'owl_uart_exit()'
    - tty: serial: rda: Fix the link time qualifier of 'rda_uart_exit()'
    - serial/sifive: select SERIAL_EARLYCON
    - tty: n_hdlc: fix build on SPARC
    - misc: fastrpc: prevent memory leak in fastrpc_dma_buf_attach
    - RDMA/core: Fix an error handling path in 'res_get_common_doit()'
    - RDMA/cm: Fix memory leak in cm_add/remove_one
    - RDMA/nldev: Reshuffle the code to avoid need to rebind QP in error path
    - RDMA/mlx5: Do not allow rereg of a ODP MR
    - RDMA/mlx5: Order num_pending_prefetch properly with synchronize_srcu
    - RDMA/mlx5: Add missing synchronize_srcu() for MW cases
    - gpio: max77620: Use correct unit for debounce times
    - fs: cifs: mute -Wunused-const-variable message
    - arm64: vdso32: Fix broken compat vDSO build warnings
    - arm64: vdso32: Detect binutils support for dmb ishld
    - serial: mctrl_gpio: Check for NULL pointer
    - serial: 8250_...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.15.0-72.81

---------------
linux (4.15.0-72.81) bionic; urgency=medium

  * bionic/linux: 4.15.0-72.81 -proposed tracker (LP: #1854027)

  * [Regression] Bionic kernel 4.15.0-71.80 can not boot on ThunderX
    (LP: #1853326)
    - Revert "arm64: Use firmware to detect CPUs that are not affected by
      Spectre-v2"
    - Revert "arm64: Get rid of __smccc_workaround_1_hvc_*"

  * [Regression] Bionic kernel 4.15.0-71.80 can not boot on ThunderX2 and
    Kunpeng920 (LP: #1852723)
    - SAUCE: arm64: capabilities: Move setup_boot_cpu_capabilities() call to
      correct place

linux (4.15.0-71.80) bionic; urgency=medium

  * bionic/linux: 4.15.0-71.80 -proposed tracker (LP: #1852289)

  * Bionic update: upstream stable patchset 2019-10-29 (LP: #1850541)
    - panic: ensure preemption is disabled during panic()
    - f2fs: use EINVAL for superblock with invalid magic
    - [Config] updateconfigs for USB_RIO500
    - USB: rio500: Remove Rio 500 kernel driver
    - USB: yurex: Don't retry on unexpected errors
    - USB: yurex: fix NULL-derefs on disconnect
    - USB: usb-skeleton: fix runtime PM after driver unbind
    - USB: usb-skeleton: fix NULL-deref on disconnect
    - xhci: Fix false warning message about wrong bounce buffer write length
    - xhci: Prevent device initiated U1/U2 link pm if exit latency is too long
    - xhci: Check all endpoints for LPM timeout
    - usb: xhci: wait for CNR controller not ready bit in xhci resume
    - USB: adutux: fix use-after-free on disconnect
    - USB: adutux: fix NULL-derefs on disconnect
    - USB: adutux: fix use-after-free on release
    - USB: iowarrior: fix use-after-free on disconnect
    - USB: iowarrior: fix use-after-free on release
    - USB: iowarrior: fix use-after-free after driver unbind
    - USB: usblp: fix runtime PM after driver unbind
    - USB: chaoskey: fix use-after-free on release
    - USB: ldusb: fix NULL-derefs on driver unbind
    - serial: uartlite: fix exit path null pointer
    - USB: serial: keyspan: fix NULL-derefs on open() and write()
    - USB: serial: ftdi_sio: add device IDs for Sienna and Echelon PL-20
    - USB: serial: option: add Telit FN980 compositions
    - USB: serial: option: add support for Cinterion CLS8 devices
    - USB: serial: fix runtime PM after driver unbind
    - USB: usblcd: fix I/O after disconnect
    - USB: microtek: fix info-leak at probe
    - USB: dummy-hcd: fix power budget for SuperSpeed mode
    - usb: renesas_usbhs: gadget: Do not discard queues in
      usb_ep_set_{halt,wedge}()
    - usb: renesas_usbhs: gadget: Fix usb_ep_set_{halt,wedge}() behavior
    - USB: legousbtower: fix slab info leak at probe
    - USB: legousbtower: fix deadlock on disconnect
    - USB: legousbtower: fix potential NULL-deref on disconnect
    - USB: legousbtower: fix open after failed reset request
    - USB: legousbtower: fix use-after-free on release
    - staging: vt6655: Fix memory leak in vt6655_probe
    - iio: adc: ad799x: fix probe error handling
    - iio: adc: axp288: Override TS pin bias current for some models
    - iio: light: opt3001: fix mutex unlock race
    - efivar/ssdt: Don't iterate over EFI va...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.4.0-170.199

---------------
linux (4.4.0-170.199) xenial; urgency=medium

  * xenial/linux: 4.4.0-170.199 -proposed tracker (LP: #1852306)

  * update ENA driver to version 2.1.0 (LP: #1850175)
    - net: ena: fix: set freed objects to NULL to avoid failing future allocations
    - net: ena: fix swapped parameters when calling
      ena_com_indirect_table_fill_entry
    - net: ena: fix: Free napi resources when ena_up() fails
    - net: ena: fix incorrect test of supported hash function
    - net: ena: fix return value of ena_com_config_llq_info()
    - net: ena: improve latency by disabling adaptive interrupt moderation by
      default
    - net: ena: fix ena_com_fill_hash_function() implementation
    - net: ena: add handling of llq max tx burst size
    - net: ena: ethtool: add extra properties retrieval via get_priv_flags
    - net: ena: replace free_tx/rx_ids union with single free_ids field in
      ena_ring
    - net: ena: arrange ena_probe() function variables in reverse christmas tree
    - net: ena: add newline at the end of pr_err prints
    - net: ena: allow automatic fallback to polling mode
    - net: ena: add support for changing max_header_size in LLQ mode
    - net: ena: optimise calculations for CQ doorbell
    - net: ena: add good checksum counter
    - net: ena: use dev_info_once instead of static variable
    - net: ena: add MAX_QUEUES_EXT get feature admin command
    - net: ena: enable negotiating larger Rx ring size
    - net: ena: make ethtool show correct current and max queue sizes
    - net: ena: allow queue allocation backoff when low on memory
    - net: ena: add ethtool function for changing io queue sizes
    - net: ena: remove inline keyword from functions in *.c
    - net: ena: update driver version from 2.0.3 to 2.1.0
    - net: ena: Fix bug where ring allocation backoff stopped too late
    - Revert "net: ena: ethtool: add extra properties retrieval via
      get_priv_flags"
    - net: ena: don't wake up tx queue when down
    - net: ena: clean up indentation issue

  * Bionic update: upstream stable patchset 2019-08-01 (LP: #1838700) // update
    ENA driver to version 2.1.0 (LP: #1850175)
    - net: ena: gcc 8: fix compilation warning

  * Skip frame when buffer overflow on UVC camera (LP: #1849871)
    - media: uvcvideo: Mark buffer error where overflow

  * CVE-2018-20784
    - sched/fair: Fix infinite loop in update_blocked_averages() by reverting
      a9e7f6544b9c
    - sched/fair: Fix hierarchical order in rq->leaf_cfs_rq_list
    - sched/fair: Add tmp_alone_branch assertion
    - sched/fair: Fix insertion in rq->leaf_cfs_rq_list
    - sched/fair: Optimize update_blocked_averages()
    - sched/fair: Fix O(nr_cgroups) in the load balancing path

  * Xenial update: 4.4.200 upstream stable release (LP: #1852110)
    - kbuild: add -fcf-protection=none when using retpoline flags
    - regulator: ti-abb: Fix timeout in ti_abb_wait_txdone/ti_abb_clear_all_txdone
    - regulator: pfuze100-regulator: Variable "val" in pfuze100_regulator_probe()
      could be uninitialized
    - ASoc: rockchip: i2s: Fix RPM imbalance
    - ARM: dts: logicpd-torpedo-som: Remove tw...

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

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

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!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.3.0-24.26

---------------
linux (5.3.0-24.26) eoan; urgency=medium

  * eoan/linux: 5.3.0-24.26 -proposed tracker (LP: #1852232)

  * Eoan update: 5.3.9 upstream stable release (LP: #1851550)
    - io_uring: fix up O_NONBLOCK handling for sockets
    - dm snapshot: introduce account_start_copy() and account_end_copy()
    - dm snapshot: rework COW throttling to fix deadlock
    - Btrfs: fix inode cache block reserve leak on failure to allocate data space
    - btrfs: qgroup: Always free PREALLOC META reserve in
      btrfs_delalloc_release_extents()
    - iio: adc: meson_saradc: Fix memory allocation order
    - iio: fix center temperature of bmc150-accel-core
    - libsubcmd: Make _FORTIFY_SOURCE defines dependent on the feature
    - perf tests: Avoid raising SEGV using an obvious NULL dereference
    - perf map: Fix overlapped map handling
    - perf script brstackinsn: Fix recovery from LBR/binary mismatch
    - perf jevents: Fix period for Intel fixed counters
    - perf tools: Propagate get_cpuid() error
    - perf annotate: Propagate perf_env__arch() error
    - perf annotate: Fix the signedness of failure returns
    - perf annotate: Propagate the symbol__annotate() error return
    - perf annotate: Fix arch specific ->init() failure errors
    - perf annotate: Return appropriate error code for allocation failures
    - perf annotate: Don't return -1 for error when doing BPF disassembly
    - staging: rtl8188eu: fix null dereference when kzalloc fails
    - RDMA/siw: Fix serialization issue in write_space()
    - RDMA/hfi1: Prevent memory leak in sdma_init
    - RDMA/iw_cxgb4: fix SRQ access from dump_qp()
    - RDMA/iwcm: Fix a lock inversion issue
    - HID: hyperv: Use in-place iterator API in the channel callback
    - kselftest: exclude failed TARGETS from runlist
    - selftests/kselftest/runner.sh: Add 45 second timeout per test
    - nfs: Fix nfsi->nrequests count error on nfs_inode_remove_request
    - arm64: cpufeature: Effectively expose FRINT capability to userspace
    - arm64: Fix incorrect irqflag restore for priority masking for compat
    - arm64: ftrace: Ensure synchronisation in PLT setup for Neoverse-N1 #1542419
    - tty: serial: owl: Fix the link time qualifier of 'owl_uart_exit()'
    - tty: serial: rda: Fix the link time qualifier of 'rda_uart_exit()'
    - serial/sifive: select SERIAL_EARLYCON
    - tty: n_hdlc: fix build on SPARC
    - misc: fastrpc: prevent memory leak in fastrpc_dma_buf_attach
    - RDMA/core: Fix an error handling path in 'res_get_common_doit()'
    - RDMA/cm: Fix memory leak in cm_add/remove_one
    - RDMA/nldev: Reshuffle the code to avoid need to rebind QP in error path
    - RDMA/mlx5: Do not allow rereg of a ODP MR
    - RDMA/mlx5: Order num_pending_prefetch properly with synchronize_srcu
    - RDMA/mlx5: Add missing synchronize_srcu() for MW cases
    - gpio: max77620: Use correct unit for debounce times
    - fs: cifs: mute -Wunused-const-variable message
    - arm64: vdso32: Fix broken compat vDSO build warnings
    - arm64: vdso32: Detect binutils support for dmb ishld
    - serial: mctrl_gpio: Check for NULL pointer
    - serial: 8250_...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.0.0-38.41

---------------
linux (5.0.0-38.41) disco; urgency=medium

  * disco/linux: 5.0.0-38.41 -proposed tracker (LP: #1854788)

  * [Regression] Failed to boot disco kernel built from master-next (kernel
    kernel NULL pointer dereference) (LP: #1853981)
    - SAUCE: blk-mq: Fix blk_mq_make_request for mq devices

  * CVE-2019-14901
    - SAUCE: mwifiex: Fix heap overflow in mmwifiex_process_tdls_action_frame()

  * CVE-2019-14896 // CVE-2019-14897
    - SAUCE: libertas: Fix two buffer overflows at parsing bss descriptor

  * CVE-2019-14895
    - SAUCE: mwifiex: fix possible heap overflow in mwifiex_process_country_ie()

  * [CML] New device id's for CMP-H (LP: #1846335)
    - mmc: sdhci-pci: Add another Id for Intel CML
    - i2c: i801: Add support for Intel Comet Lake PCH-H
    - mtd: spi-nor: intel-spi: Add support for Intel Comet Lake-H SPI serial flash
    - mfd: intel-lpss: Add Intel Comet Lake PCH-H PCI IDs

  * Please add patch fixing RK818 ID detection (LP: #1853192)
    - SAUCE: mfd: rk808: Fix RK818 ID template

  * [SRU][B/OEM-B/OEM-OSP1/D] Enable new Elan touchpads which are not in current
    whitelist (LP: #1853246)
    - Input: elan_i2c - export the device id whitelist
    - HID: quirks: Refactor ELAN 400 and 401 handling

  * Lenovo dock MAC Address pass through doesn't work in Ubuntu (LP: #1827961)
    - r8152: Add macpassthru support for ThinkPad Thunderbolt 3 Dock Gen 2

  * [CML-S62] Need enable turbostat patch support for Comet lake- S 6+2
    (LP: #1847451)
    - SAUCE: tools/power turbostat: Add Cometlake support

  * External microphone can't work on some dell machines with the codec alc256
    or alc236 (LP: #1853791)
    - SAUCE: ALSA: hda/realtek - Move some alc256 pintbls to fallback table
    - SAUCE: ALSA: hda/realtek - Move some alc236 pintbls to fallback table

  * Memory leak in net/xfrm/xfrm_state.c - 8 pages per ipsec connection
    (LP: #1853197)
    - xfrm: Fix memleak on xfrm state destroy

  * CVE-2019-18660: patches for Ubuntu (LP: #1853142) // CVE-2019-18660
    - powerpc/64s: support nospectre_v2 cmdline option
    - powerpc/book3s64: Fix link stack flush on context switch
    - KVM: PPC: Book3S HV: Flush link stack on guest exit to host kernel

  * Raydium Touchscreen on ThinkPad L390 does not work (LP: #1849721)
    - HID: i2c-hid: fix no irq after reset on raydium 3118

  * Make Goodix I2C touchpads work (LP: #1853842)
    - HID: i2c-hid: Remove runtime power management
    - HID: i2c-hid: Send power-on command after reset

  * Touchpad doesn't work on Dell Inspiron 7000 2-in-1 (LP: #1851901)
    - Revert "UBUNTU: SAUCE: mfd: intel-lpss: add quirk for Dell XPS 13 7390
      2-in-1"
    - lib: devres: add a helper function for ioremap_uc
    - mfd: intel-lpss: Use devm_ioremap_uc for MMIO

  * CVE-2019-19055
    - nl80211: fix memory leak in nl80211_get_ftm_responder_stats

  * [CML-S62] Need enable intel_rapl patch support for Comet lake- S 6+2
    (LP: #1847454)
    - powercap/intel_rapl: add support for CometLake Mobile
    - powercap/intel_rapl: add support for Cometlake desktop

  * [CML-S62] Need enable intel_pmc_core driver patch for Comet l...