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[Launchpad Bug Tracker <1452547@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.19.0-20.20

---------------
linux (3.19.0-20.20) vivid; urgency=low

  [ Luis Henriques ]

  * Release Tracking Bug
    - LP: #1459957
  * Revert "SAUCE: Call i915_bpo specific functions from the hda driver"
    - LP: #1457369

linux (3.19.0-19.19) vivid; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1458964

  [ Duc Dang ]

  * SAUCE: (no-up) [PCIE] APM X-Gene: Remove debug messages in MSI
    interrupt handler path.
    - LP: #1451593

  [ Luis Henriques ]

  * [Config] updateconfigs for 3.19.7 stable update

  [ Paolo Pisati ]

  * [Config] armhf: CPUFREQ_DT=y
    - LP: #1457781
  * annotations: enforce CPUFREQ_DT
    - LP: #1457781

  [ Tanmay Inamdar ]

  * SAUCE: (no-up) Add MSI/MSI-X driver for APM PCI bus
    - LP: #1451593

  [ Timo Aaltonen ]

  * SAUCE: i915_bpo: Rebase to v4.1-rc4.
    - LP: #1456123
  * SAUCE: i915_bpo: Revert dma-buf: cleanup dma_buf_export() to make it
    easily extensible
    - LP: #1456123

  [ Tuan Phan ]

  * SAUCE: (no-up) pci-xgene-msi: fixed deadlock in irq_set_affinity
    - LP: #1451593

  [ Upstream Kernel Changes ]

  * Revert "nfs: replace nfs_add_stats with nfs_inc_stats when add one"
    - LP: #1454699
  * cpufreq: powernv: Report cpu frequency throttling
    - LP: #1452547
  * x86: kvm: Revert "remove sched notifier for cross-cpu migrations"
    - LP: #1450584
  * x86: vdso: fix pvclock races with task migration
    - LP: #1450584
  * ip_forward: Drop frames with attached skb->sk
    - LP: #1454699
  * net: add skb_checksum_complete_unset
    - LP: #1454699
  * ppp: call skb_checksum_complete_unset in ppp_receive_frame
    - LP: #1454699
  * tcp: fix possible deadlock in tcp_send_fin()
    - LP: #1454699
  * tcp: avoid looping in tcp_send_fin()
    - LP: #1454699
  * net: do not deplete pfmemalloc reserve
    - LP: #1454699
  * net: fix crash in build_skb()
    - LP: #1454699
  * pxa168: fix double deallocation of managed resources
    - LP: #1454699
  * net/mlx4_en: Prevent setting invalid RSS hash function
    - LP: #1454699
  * md: fix md io stats accounting broken
    - LP: #1454699
  * x86/asm/decoder: Fix and enforce max instruction size in the insn
    decoder
    - LP: #1454699
  * sched/idle/x86: Restore mwait_idle() to fix boot hangs, to improve
    power savings and to improve performance
    - LP: #1454699
  * sched/idle/x86: Optimize unnecessary mwait_idle() resched IPIs
    - LP: #1454699
  * perf/x86/intel: Fix Core2,Atom,NHM,WSM cycles:pp events
    - LP: #1454699
  * KVM: x86: Fix MSR_IA32_BNDCFGS in msrs_to_save
    - LP: #1454699
  * Btrfs: fix log tree corruption when fs mounted with -o discard
    - LP: #1454699
  * btrfs: don't accept bare namespace as a valid xattr
    - LP: #1454699
  * Btrfs: fix inode eviction infinite loop after cloning into it
    - LP: #1454699
  * Btrfs: fix inode eviction infinite loop after extent_same ioctl
    - LP: #1454699
  * usb: gadget: printer: enqueue printer's response for setup request
    - LP: #1454699
  * KVM: s390: fix handling of write errors in the tpi handler
    - LP: #1454699
  * KVM: s390: reinjection of irqs can fail in the tpi handler
    - LP: #1454699
  * KVM: s390: Zero out current VMDB of STSI before including level3 data.
    - LP: #1454699
  * KVM: s390: no need to hold the kvm->mutex for floating interrupts
    - LP: #1454699
  * KVM: s390: fix get_all_floating_irqs
    - LP: #1454699
  * s390/hibernate: fix save and restore of kernel text section
    - LP: #1454699
  * KVM: use slowpath for cross page cached accesses
    - LP: #1454699
  * KVM: arm/arm64: check IRQ number on userland injection
    - LP: #1454699
  * KVM: arm/arm64: vgic: vgic_init returns -ENODEV when no online vcpu
    - LP: #1454699
  * ARM: KVM: Fix size check in __coherent_cache_guest_page
    - LP: #1454699
  * arm64: KVM: Fix stage-2 PGD allocation to have per-page refcounting
    - LP: #1454699
  * arm64: KVM: Do not use pgd_index to index stage-2 pgd
    - LP: #1454699
  * arm/arm64: KVM: Keep elrsr/aisr in sync with software model
    - LP: #1454699
  * MIPS: KVM: Handle MSA Disabled exceptions from guest
    - LP: #1454699
  * MIPS: lose_fpu(): Disable FPU when MSA enabled
    - LP: #1454699
  * MIPS: Malta: Detect and fix bad memsize values
    - LP: #1454699
  * MIPS: asm: asm-eva: Introduce kernel load/store variants
    - LP: #1454699
  * MIPS: Loongson-3: Add IRQF_NO_SUSPEND to Cascade irqaction
    - LP: #1454699
  * MIPS: Hibernate: flush TLB entries earlier
    - LP: #1454699
  * staging: panel: fix lcd type
    - LP: #1454699
  * staging: android: sync: Fix memory corruption in
    sync_timeline_signal().
    - LP: #1454699
  * staging: vt6655: use ieee80211_tx_info to select packet type.
    - LP: #1454699
  * drivers/base: cacheinfo: validate device node for all the caches
    - LP: #1454699
  * cdc-wdm: fix endianness bug in debug statements
    - LP: #1454699
  * mmc: sunxi: Use devm_reset_control_get_optional() for reset control
    - LP: #1454699
  * spi: imx: read back the RX/TX watermark levels earlier
    - LP: #1454699
  * spi: spidev: fix possible arithmetic overflow for multi-transfer
    message
    - LP: #1454699
  * compal-laptop: Fix leaking hwmon device
    - LP: #1454699
  * compal-laptop: Check return value of power_supply_register
    - LP: #1454699
  * ring-buffer: Replace this_cpu_*() with __this_cpu_*()
    - LP: #1454699
  * power_supply: twl4030_madc: Check return value of power_supply_register
    - LP: #1454699
  * power_supply: lp8788-charger: Fix leaked power supply on probe fail
    - LP: #1454699
  * power_supply: ipaq_micro_battery: Fix leaking workqueue
    - LP: #1454699
  * power_supply: ipaq_micro_battery: Check return values in probe
    - LP: #1454699
  * NFS: fix BUG() crash in notify_change() with patch to chown_common()
    - LP: #1454699
  * ARM: fix broken hibernation
    - LP: #1454699
  * ARM: 8320/1: fix integer overflow in ELF_ET_DYN_BASE
    - LP: #1454699
  * ARM: mvebu: Disable CPU Idle on Armada 38x
    - LP: #1454699
  * ARM: S3C64XX: Use fixed IRQ bases to avoid conflicts on Cragganmore
    - LP: #1454699
  * ARM: at91/dt: sama5d3 xplained: add phy address for macb1
    - LP: #1454699
  * ARM: dts: dove: Fix uart[23] reg property
    - LP: #1454699
  * ARM: dts: fix mmc node updates for exynos5250-spring
    - LP: #1454699
  * usb: musb: core: fix TX/RX endpoint order
    - LP: #1454699
  * usb: phy: Find the right match in devm_usb_phy_match
    - LP: #1454699
  * usb: define a generic USB_RESUME_TIMEOUT macro
    - LP: #1454699
  * usb: musb: use new USB_RESUME_TIMEOUT
    - LP: #1454699
  * usb: host: oxu210hp: use new USB_RESUME_TIMEOUT
    - LP: #1454699
  * usb: host: fusbh200: use new USB_RESUME_TIMEOUT
    - LP: #1454699
  * usb: host: uhci: use new USB_RESUME_TIMEOUT
    - LP: #1454699
  * usb: host: fotg210: use new USB_RESUME_TIMEOUT
    - LP: #1454699
  * usb: host: r8a66597: use new USB_RESUME_TIMEOUT
    - LP: #1454699
  * usb: host: isp116x: use new USB_RESUME_TIMEOUT
    - LP: #1454699
  * usb: host: xhci: use new USB_RESUME_TIMEOUT
    - LP: #1454699
  * usb: host: ehci: use new USB_RESUME_TIMEOUT
    - LP: #1454699
  * usb: host: sl811: use new USB_RESUME_TIMEOUT
    - LP: #1454699
  * usb: core: hub: use new USB_RESUME_TIMEOUT
    - LP: #1454699
  * clk: at91: usb: propagate rate modification to the parent clk
    - LP: #1454699
  * ALSA: hda - Add dock support for ThinkPad X250 (17aa:2226)
    - LP: #1454699
  * ALSA: emu10k1: don't deadlock in proc-functions
    - LP: #1454699
  * ALSA: hda/realtek - Enable the ALC292 dock fixup on the Thinkpad T450
    - LP: #1454699
  * ALSA: hda - fix "num_steps = 0" error on ALC256
    - LP: #1446517, #1454699
  * ALSA: hda/realtek - Fix Headphone Mic doesn't recording for ALC256
    - LP: #1454699
  * Input: elantech - fix absolute mode setting on some ASUS laptops
    - LP: #1454699
  * mfd: core: Fix platform-device name collisions
    - LP: #1454699
  * fs/binfmt_elf.c: fix bug in loading of PIE binaries
    - LP: #1454699
  * ptrace: fix race between ptrace_resume() and wait_task_stopped()
    - LP: #1454699
  * NFC: st21nfcb: Retry i2c_master_send if it returns a negative value
    - LP: #1454699
  * rtlwifi: rtl8192cu: Add new USB ID
    - LP: #1454699
  * rtlwifi: rtl8192cu: Add new device ID
    - LP: #1454699
  * ext4: make fsync to sync parent dir in no-journal for real this time
    - LP: #1454699
  * mnt: Improve the umount_tree flags
    - LP: #1454699
  * mnt: Don't propagate umounts in __detach_mounts
    - LP: #1454699
  * perf symbols: Define STT_GNU_IFUNC for glibc 2.9 and older.
    - LP: #1454699
  * perf tools: Fix perf-read-vdsox32 not building and lib64 install dir
    - LP: #1454699
  * perf tools: Work around lack of sched_getcpu in glibc < 2.6.
    - LP: #1454699
  * tools lib traceevent kbuffer: Remove extra update to data pointer in
    PADDING
    - LP: #1454699
  * tools/power turbostat: Use $(CURDIR) instead of $(PWD) and add support
    for O= option in Makefile
    - LP: #1454699
  * UBI: account for bitflips in both the VID header and data
    - LP: #1454699
  * UBI: fix out of bounds write
    - LP: #1454699
  * UBI: initialize LEB number variable
    - LP: #1454699
  * UBI: fix check for "too many bytes"
    - LP: #1454699
  * scsi: storvsc: Fix a bug in copy_from_bounce_buffer()
    - LP: #1454699
  * target: Fix COMPARE_AND_WRITE with SG_TO_MEM_NOALLOC handling
    - LP: #1454699
  * target/file: Fix BUG() when CONFIG_DEBUG_SG=y and DIF protection
    enabled
    - LP: #1454699
  * target/file: Fix UNMAP with DIF protection support
    - LP: #1454699
  * target/file: Fix SG table for prot_buf initialization
    - LP: #1454699
  * iser-target: Fix session hang in case of an rdma read DIF error
    - LP: #1454699
  * iser-target: Fix possible deadlock in RDMA_CM connection error
    - LP: #1454699
  * Bluetooth: ath3k: Add support Atheros AR5B195 combo Mini PCIe card
    - LP: #1454699
  * arm64: fix midr range for Cortex-A57 erratum 832075
    - LP: #1454699
  * arm64: head.S: ensure visibility of page tables
    - LP: #1454699
  * arm64: apply alternatives for !SMP kernels
    - LP: #1454699
  * arm64: errata: add workaround for cortex-a53 erratum #845719
    - LP: #1454699
  * powerpc/powernv: Don't map M64 segments using M32DT
    - LP: #1454699
  * powerpc: Fix missing L2 cache size in /sys/devices/system/cpu
    - LP: #1454699
  * powerpc/cell: Fix crash in iic_setup_cpu() after per_cpu changes
    - LP: #1454699
  * powerpc/cell: Fix cell iommu after it_page_shift changes
    - LP: #1454699
  * ASoC: cs4271: Increase delay time after reset
    - LP: #1454699
  * ASoC: wm8741: Fix rates constraints values
    - LP: #1454699
  * ASoC: davinci-evm: drop un-necessary remove function
    - LP: #1454699
  * ASoC: pcm512x: Add 'Analogue' prefix to analogue volume controls
    - LP: #1454699
  * ACPICA: Utilities: split IO address types from data type models.
    - LP: #1454699
  * ACPICA: Tables: Don't release ACPI_MTX_TABLES in
    acpi_tb_install_standard_table().
    - LP: #1454699
  * ACPI / scan: Annotate physical_node_lock in acpi_scan_is_offline()
    - LP: #1454699
  * xtensa: xtfpga: fix hardware lockup caused by LCD driver
    - LP: #1454699
  * xtensa: provide __NR_sync_file_range2 instead of __NR_sync_file_range
    - LP: #1454699
  * xtensa: ISS: fix locking in TAP network adapter
    - LP: #1454699
  * gpio: mvebu: Fix mask/unmask managment per irq chip type
    - LP: #1454699
  * clk: samsung: exynos4: Disable ARMCLK down feature on Exynos4210 SoC
    - LP: #1454699
  * clk: tegra: Register the proper number of resets
    - LP: #1454699
  * clk: qcom: Fix i2c frequency table
    - LP: #1454699
  * clk: qcom: fix RCG M/N counter configuration
    - LP: #1454699
  * dm crypt: fix deadlock when async crypto algorithm returns -EBUSY
    - LP: #1454699
  * sd: Unregister integrity profile
    - LP: #1454699
  * sd: Fix missing ATO tag check
    - LP: #1454699
  * Drivers: hv: vmbus: Fix a bug in the error path in vmbus_open()
    - LP: #1454699
  * mvsas: fix panic on expander attached SATA devices
    - LP: #1454699
  * rc: img-ir: fix error in parameters passed to irq_free()
    - LP: #1454699
  * stk1160: Make sure current buffer is released
    - LP: #1454699
  * IB/core: disallow registering 0-sized memory region
    - LP: #1454699
  * IB/core: don't disallow registering region starting at 0x0
    - LP: #1454699
  * IB/mlx4: Fix WQE LSO segment calculation
    - LP: #1454699
  * IB/iser: Fix wrong calculation of protection buffer length
    - LP: #1454699
  * tracing: Handle ftrace_dump() atomic context in graph_trace_open()
    - LP: #1454699
  * tracing: Fix incorrect enabling of trace events by boot cmdline
    - LP: #1454699
  * i2c: mux: use proper dev when removing "channel-X" symlinks
    - LP: #1454699
  * i2c: rk3x: report number of messages transmitted
    - LP: #1454699
  * i2c: core: Export bus recovery functions
    - LP: #1454699
  * drm/radeon: fix doublescan modes (v2)
    - LP: #1454699
  * drm/i915: Dont enable CS_PARSER_ERROR interrupts at all
    - LP: #1454699
  * drm: adv7511: Fix DDC error interrupt handling
    - LP: #1454699
  * drm: adv7511: Fix nested sleep when reading EDID
    - LP: #1454699
  * drm/i915: vlv: fix save/restore of GFX_MAX_REQ_COUNT reg
    - LP: #1454699
  * drm/i915: cope with large i2c transfers
    - LP: #1454699
  * RCU pathwalk breakage when running into a symlink overmounting
    something
    - LP: #1454699
  * nfsd4: disallow ALLOCATE with special stateids
    - LP: #1454699
  * nfsd4: fix READ permission checking
    - LP: #1454699
  * nfsd4: disallow SEEK with special stateids
    - LP: #1454699
  * nfsd: eliminate NFSD_DEBUG
    - LP: #1454699
  * NFS: Add a stub for GETDEVICELIST
    - LP: #1454699
  * e1000: add dummy allocator to fix race condition between mtu change and
    netpoll
    - LP: #1454699
  * mac80211: send AP probe as unicast again
    - LP: #1454699
  * ebpf: verifier: check that call reg with ARG_ANYTHING is initialized
    - LP: #1454699
  * lib: memzero_explicit: use barrier instead of OPTIMIZER_HIDE_VAR
    - LP: #1454699
  * wl18xx: show rx_frames_per_rates as an array as it really is
    - LP: #1454699
  * crypto: omap-aes - Fix support for unequal lengths
    - LP: #1454699
  * C6x: time: Ensure consistency in __init
    - LP: #1454699
  * memstick: mspro_block: add missing curly braces
    - LP: #1454699
  * drivers: platform: parse IRQ flags from resources
    - LP: #1454699
  * driver core: bus: Goto appropriate labels on failure in bus_add_device
    - LP: #1454699
  * netfilter: bridge: really save frag_max_size between PRE and
    POST_ROUTING
    - LP: #1454699
  * Linux 3.19.7
    - LP: #1454699
  * bpf: fix 64-bit divide
    - LP: #1454702
  * route: Use ipv4_mtu instead of raw rt_pmtu
    - LP: #1454702
  * mlx4: Fix tx ring affinity_mask creation
    - LP: #1454702
  * cxgb4: Fix MC1 memory offset calculation
    - LP: #1454702
  * net/mlx4_en: Schedule napi when RX buffers allocation fails
    - LP: #1454702
  * ipv4: Missing sk_nulls_node_init() in ping_unhash().
    - LP: #1454702
  * clk: at91: usb: fix determine_rate prototype
    - LP: #1454702
  * Linux 3.19.8
    - LP: #1454702
  * mmc: card: Don't access RPMB partitions for normal read/write
    - LP: #1454013
  * (upstream) gpio: dwapb: re-enable GPIO_DWAPB for arm64
    - LP: #1455105
  * iwlwifi: mvm: fix BT coex shared antenna activity check
    - LP: #1442411
  * ext4: allocate entire range in zero range
    - LP: #1425270
    - CVE-2015-0275
  * kernel.h: implement DIV_ROUND_CLOSEST_ULL
    - LP: #1456123
  * drm: fix drm_mode_getconnector() locking imbalance regression
    - LP: #1456123
  * drm/i915/skl: Fix WaDisableChickenBitTSGBarrierAckForFFSliceCS
    - LP: #1456123
  * vhost/scsi: potential memory corruption
    - LP: #1457807
    - CVE-2015-4036

  [ Ville Syrjälä ]

  * SAUCE: i915_bpo: drm/i915: Implement chv display PHY lane stagger setup
    - LP: #1456123
  * SAUCE: i915_bpo: drm/i915: Work around DISPLAY_PHY_CONTROL register
    corruption on CHV
    - LP: #1456123
  * SAUCE: i915_bpo: Revert "drm/i915: Hack to tie both common lanes
    together on chv"
    - LP: #1456123

 -- Luis Henriques <luis.henriques@xxxxxxxxxxxxx>  Fri, 29 May 2015
09:41:30 +0100

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

-- 
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https://bugs.launchpad.net/bugs/1452547

Title:
  Report cpu frequency throttling

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Vivid:
  Fix Released

Bug description:
  [Impact]

  == Comment: #0 - Shilpasri G. Bhat <shigbhat@xxxxxxxxxx> - 2015-05-06 07:24:11 ==
  The user can see a drop in performance when frequency is throttled and
  is unaware of throttling. So detect and report such a condition, so
  the user can check the OCC status to reboot the system or check for
  power supply or fan failures.

  The cpu frequency can be throttled by OCC for the following reasons:
  1)If a processor crosses its power and temperature limit then OCC will
  lower its Pmax to reduce the frequency and voltage.
  2)If OCC crashes then the system is forced to Psafe frequency.
  3)If OCC fails to recover then the kernel is not allowed to do any
   further frequency changes and the chip will remain in Psafe.

  
  [Test Case]
  Get into a state where hardware OCC throttles CPU frequency.
  Ensure kernel log shows cpufreq throttling messages.

  
  [Fix]

  This bug is fixed upstream 09a972d1620934142d30cfda455ffe429af751c4

  ---uname output---
  3.19.0-15

  Machine Type = llmtul02b.in.ibm.com

  Contact Information = Shilpasri G Bhat /
  shilpa.bhat@xxxxxxxxxxxxxxxxxx

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