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[Launchpad Bug Tracker <1554608@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.2.0-34.39

---------------
linux (4.2.0-34.39) wily; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1555821

  [ Florian Westphal ]

  * SAUCE: [nf] netfilter: x_tables: check for size overflow
    - LP: #1555353
  * SAUCE: [nf,v2] netfilter: x_tables: don't rely on well-behaving
    userspace
    - LP: #1555338

linux (4.2.0-33.38) wily; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1554649

  [ Upstream Kernel Changes ]

  * Revert "drm/radeon: call hpd_irq_event on resume"
    - LP: #1554608
  * cxl: Fix PSL timebase synchronization detection
    - LP: #1532914

linux (4.2.0-32.37) wily; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1550045

  [ Kamal Mostafa ]

  * Merged back Ubuntu-4.2.0-31.36

linux (4.2.0-31.36) wily; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1548579

  [ Andy Whitcroft ]

  * [Debian] hv: hv_set_ifconfig -- convert to python3
    - LP: #1506521
  * [Debian] hv: hv_set_ifconfig -- switch to approved indentation
    - LP: #1540586
  * [Debian] hv: hv_set_ifconfig -- fix numerous parameter handling issues
    - LP: #1540586

  [ Carol L Soto ]

  * SAUCE: IB/IPoIB: Do not set skb truesize since using one linearskb
    - LP: #1541326

  [ Dan Streetman ]

  * SAUCE: nbd: ratelimit error msgs after socket close
    - LP: #1505564

  [ Tim Gardner ]

  * Revert "SAUCE: (noup) cxlflash: Fix to avoid virtual LUN failover
    failure"
    - LP: #1541635
  * Revert "SAUCE: (noup) cxlflash: Fix to escalate LINK_RESET also on port
    1"
    - LP: #1541635
  * [Config] ARMV8_DEPRECATED=y
    - LP: #1545542

  [ Upstream Kernel Changes ]

  * x86/xen/p2m: hint at the last populated P2M entry
    - LP: #1542941
  * mm: add dma_pool_zalloc() call to DMA API
    - LP: #1543737
  * sctp: Prevent soft lockup when sctp_accept() is called during a timeout
    event
    - LP: #1543737
  * xen-netback: respect user provided max_queues
    - LP: #1543737
  * xen-netfront: respect user provided max_queues
    - LP: #1543737
  * xen-netfront: update num_queues to real created
    - LP: #1543737
  * iio: adis_buffer: Fix out-of-bounds memory access
    - LP: #1543737
  * KVM: PPC: Fix emulation of H_SET_DABR/X on POWER8
    - LP: #1543737
  * KVM: PPC: Fix ONE_REG AltiVec support
    - LP: #1543737
  * x86/irq: Call chip->irq_set_affinity in proper context
    - LP: #1543737
  * drm/amdgpu: fix tonga smu resume
    - LP: #1543737
  * perf kvm record/report: 'unprocessable sample' error while
    recording/reporting guest data
    - LP: #1543737
  * hrtimer: Handle remaining time proper for TIME_LOW_RES
    - LP: #1543737
  * timerfd: Handle relative timers with CONFIG_TIME_LOW_RES proper
    - LP: #1543737
  * posix-timers: Handle relative timers with CONFIG_TIME_LOW_RES proper
    - LP: #1543737
  * itimers: Handle relative timers with CONFIG_TIME_LOW_RES proper
    - LP: #1543737
  * drm/amdgpu: Use drm_calloc_large for VM page_tables array
    - LP: #1543737
  * drm/amdgpu: fix amdgpu_bo_pin_restricted VRAM placing v2
    - LP: #1543737
  * drm/radeon: properly byte swap vce firmware setup
    - LP: #1543737
  * ACPI: Revert "ACPI / video: Add Dell Inspiron 5737 to the blacklist"
    - LP: #1543737
  * ACPI / PCI / hotplug: unlock in error path in acpiphp_enable_slot()
    - LP: #1543737
  * hwmon: (dell-smm) Blacklist Dell Studio XPS 8000
    - LP: #1543737
  * usb: cdc-acm: handle unlinked urb in acm read callback
    - LP: #1543737
  * usb: cdc-acm: send zero packet for intel 7260 modem
    - LP: #1543737
  * cdc-acm:exclude Samsung phone 04e8:685d
    - LP: #1543737
  * usb: hub: do not clear BOS field during reset device
    - LP: #1543737
  * USB: cp210x: add ID for IAI USB to RS485 adaptor
    - LP: #1543737
  * USB: visor: fix null-deref at probe
    - LP: #1543737
  * USB: serial: visor: fix crash on detecting device without write_urbs
    - LP: #1543737
  * USB: serial: option: Adding support for Telit LE922
    - LP: #1543737
  * ALSA: seq: Fix incorrect sanity check at snd_seq_oss_synth_cleanup()
    - LP: #1543737
  * ALSA: seq: Degrade the error message for too many opens
    - LP: #1543737
  * USB: serial: ftdi_sio: add support for Yaesu SCU-18 cable
    - LP: #1543737
  * arm64: kernel: fix architected PMU registers unconditional access
    - LP: #1543737
  * USB: option: fix Cinterion AHxx enumeration
    - LP: #1543737
  * ALSA: compress: Disable GET_CODEC_CAPS ioctl for some architectures
    - LP: #1543737
  * ALSA: usb-audio: Fix TEAC UD-501/UD-503/NT-503 usb delay
    - LP: #1543737
  * virtio_pci: fix use after free on release
    - LP: #1543737
  * ALSA: bebob: Use a signed return type for get_formation_index
    - LP: #1543737
  * arm64: errata: Add -mpc-relative-literal-loads to build flags
    - LP: #1533009, #1543737
  * arm64: mm: avoid calling apply_to_page_range on empty range
    - LP: #1543737
  * x86/mm: Fix types used in pgprot cacheability flags translations
    - LP: #1543737
  * powerpc/eeh: Fix PE location code
    - LP: #1543737
  * SCSI: fix crashes in sd and sr runtime PM
    - LP: #1543737
  * tty: Fix unsafe ldisc reference via ioctl(TIOCGETD)
    - LP: #1543737
  * n_tty: Fix unsafe reference to "other" ldisc
    - LP: #1543737
  * staging/speakup: Use tty_ldisc_ref() for paste kworker
    - LP: #1543737
  * tick/nohz: Set the correct expiry when switching to nohz/lowres mode
    - LP: #1543737
  * irqchip/atmel-aic: Fix wrong bit operation for IRQ priority
    - LP: #1543737
  * seccomp: always propagate NO_NEW_PRIVS on tsync
    - LP: #1543737
  * drm/radeon: cleaned up VCO output settings for DP audio
    - LP: #1543737
  * drm/radeon: Add a common function for DFS handling
    - LP: #1543737
  * drm/radeon: fix DP audio support for APU with DCE4.1 display engine
    - LP: #1543737
  * cpufreq: Fix NULL reference crash while accessing policy->governor_data
    - LP: #1543737
  * cpufreq: pxa2xx: fix pxa_cpufreq_change_voltage prototype
    - LP: #1543737
  * ALSA: dummy: Disable switching timer backend via sysfs
    - LP: #1543737
  * drm/vmwgfx: respect 'nomodeset'
    - LP: #1543737
  * Staging: speakup: Fix getting port information
    - LP: #1543737
  * x86/mm/pat: Avoid truncation when converting cpa->numpages to address
    - LP: #1543737
  * serial: 8250_pci: Add Intel Broadwell ports
    - LP: #1543737
  * perf annotate browser: Fix behaviour of Shift-Tab with nothing focussed
    - LP: #1543737
  * perf hists: Fix HISTC_MEM_DCACHELINE width setting
    - LP: #1543737
  * powerpc/perf: Remove PPMU_HAS_SSLOT flag for Power8
    - LP: #1543737
  * Linux 4.2.8-ckt4
    - LP: #1543737
  * cxlflash: Resolve oops in wait_port_offline
    - LP: #1541635
  * cxlflash: Fix to resolve cmd leak after host reset
    - LP: #1541635
  * cxlflash: Removed driver date print
    - LP: #1541635
  * cxlflash: drop unlikely before IS_ERR_OR_NULL
    - LP: #1541635
  * powerpc/powernv: Panic on unhandled Machine Check
    - LP: #1541635
  * cxlflash: Fix to avoid virtual LUN failover failure
    - LP: #1541635
  * cxlflash: Fix to escalate LINK_RESET also on port 1
    - LP: #1541635
  * IB/ipoib: Suppress warning for send only join failures
    - LP: #1542444
  * IB/ipoib: Expire sendonly multicast joins
    - LP: #1542444
  * IB/ipoib: increase the max mcast backlog queue
    - LP: #1542444
  * IB/ipoib: For sendonly join free the multicast group on leave
    - LP: #1542444
  * qeth: initialize net_device with carrier off
    - LP: #1541907
  * mwifiex: remove USB8897 chipset support
    - LP: #1494593
  * powerpc/powernv: Fix stale PE primary bus
    - LP: #1546145
  * ALSA: usb-audio: avoid freeing umidi object twice
    - LP: #1546177
    - CVE-2016-2384

 -- Brad Figg <brad.figg@xxxxxxxxxxxxx>  Thu, 10 Mar 2016 13:46:44 -0800

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

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-2384

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https://bugs.launchpad.net/bugs/1554608

Title:
  Radeon hybrid graphics problem on resume

Status in linux package in Ubuntu:
  Fix Released
Status in linux-lts-utopic package in Ubuntu:
  Invalid
Status in linux source package in Trusty:
  Fix Committed
Status in linux-lts-utopic source package in Trusty:
  Fix Committed
Status in linux source package in Vivid:
  Fix Committed
Status in linux source package in Wily:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  From mainline commit 256faed: Revert "drm/radeon: call hpd_irq_event on resume"
  (Ubuntu kernels T, U, V, W, and X carry the patch to be reverted).

  -----

  commit 256faedcfd646161477d47a1a78c32a562d2e845
  Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
  Date:   Mon Mar 7 13:15:09 2016 -0800

      Revert "drm/radeon: call hpd_irq_event on resume"
      
      This reverts commit dbb17a21c131eca94eb31136eee9a7fe5aff00d9.
      
      It turns out that commit can cause problems for systems with multiple
      GPUs, and causes X to hang on at least a HP Pavilion dv7 with hybrid
      graphics.
      
      This got noticed originally in 4.4.4, where this patch had already
      gotten back-ported, but 4.5-rc7 was verified to have the same problem.
      
      Alexander Deucher says:
       "It looks like you have a muxed system so I suspect what's happening is
        that one of the display is being reported as connected for both the
        IGP and the dGPU and then the desktop environment gets confused or
        there some sort problem in the detect functions since the mux is not
        switched to the dGPU.  I don't see an easy fix unless Dave has any
        ideas.  I'd say just revert for now"
      
      Reported-by: Jörg-Volker Peetz <jvpeetz@xxxxxx>
      Acked-by: Alexander Deucher <Alexander.Deucher@xxxxxxx>
      Cc: Dave Airlie <airlied@xxxxxxxxx>
      Cc: stable@xxxxxxxxxx  # wherever dbb17a21c131 got back-ported
      Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

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