Hello I have a Thinkpad E531 and im having some issues with high CPU temperature in general. The CPU runs in 75-85 degrees Celcius most of the time. It never gets lower than 65 degrees. Anyway, there is also a warning and a message for brightness interface issue below. Below is part of the output from dmesg which includes those messages (I put some new lines there) ===== $ dmesg | grep -i acpi [ 0.000000] BIOS-e820: [mem 0x00000000dae9f000-0x00000000daf9efff] ACPI NVS [ 0.000000] BIOS-e820: [mem 0x00000000daf9f000-0x00000000daffefff] ACPI data [ 0.000000] ACPI: Early table checksum verification disabled [ 0.000000] ACPI: RSDP 0x00000000000F0120 000024 (v02 LENOVO) [ 0.000000] ACPI: XSDT 0x00000000DAFFE170 00009C (v01 LENOVO TP-HE 00001120 PTL 00000002) [ 0.000000] ACPI: FACP 0x00000000DAFED000 00010C (v05 LENOVO TP-HE 00001120 PTL 00000002) [ 0.000000] ACPI: DSDT 0x00000000DAFEF000 00C565 (v02 LENOVO TP-HE 00001120 INTL 20061109) [ 0.000000] ACPI: FACS 0x00000000DAF59000 000040 [ 0.000000] ACPI: SSDT 0x00000000DAFFD000 0007AE (v02 LENOVO SataAhci 00001000 INTL 20061109) [ 0.000000] ACPI: SSDT 0x00000000DAFFC000 0006A5 (v02 LENOVO PtidDevc 00001000 INTL 20061109) [ 0.000000] ACPI: ASF! 0x00000000DAFEE000 0000A5 (v32 LENOVO TP-HE 00001120 PTL 00000002) [ 0.000000] ACPI: HPET 0x00000000DAFEB000 000038 (v01 LENOVO TP-HE 00001120 PTL 00000002) [ 0.000000] ACPI: APIC 0x00000000DAFEA000 000098 (v03 LENOVO TP-HE 00001120 PTL 00000002) [ 0.000000] ACPI: MCFG 0x00000000DAFE9000 00003C (v01 LENOVO TP-HE 00001120 PTL 00000002) [ 0.000000] ACPI: FPDT 0x00000000DAFE8000 000064 (v01 LENOVO TP-HE 00001120 PTL 00000002) [ 0.000000] ACPI: SSDT 0x00000000DAFE7000 0009AA (v02 PmRef Cpu0Ist 00003000 INTL 20061109) [ 0.000000] ACPI: SSDT 0x00000000DAFE6000 000A97 (v02 PmRef CpuPm 00003000 INTL 20061109) [ 0.000000] ACPI: UEFI 0x00000000DAFE5000 00003E (v01 LENOVO TP-HE 00001120 PTL 00000002) [ 0.000000] ACPI: UEFI 0x00000000DAFE4000 000042 (v01 PTL COMBUF 00000001 PTL 00000001) [ 0.000000] ACPI: POAT 0x00000000DAF54000 000055 (v03 LENOVO TP-HE 00001120 PTL 00000002) [ 0.000000] ACPI: UEFI 0x00000000DAFE3000 0002BA (v01 LENOVO TP-HE 00001120 PTL 00000002) [ 0.000000] ACPI: DBG2 0x00000000DAFE2000 000070 (v00 LENOVO TP-HE 00001120 PTL 00000002) [ 0.000000] ACPI: Local APIC address 0xfee00000 [ 0.000000] ACPI: PM-Timer IO Port: 0x408 [ 0.000000] ACPI: Local APIC address 0xfee00000 [ 0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled) [ 0.000000] ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled) [ 0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x02] enabled) [ 0.000000] ACPI: LAPIC (acpi_id[0x04] lapic_id[0x03] enabled) [ 0.000000] ACPI: LAPIC (acpi_id[0x05] lapic_id[0x00] disabled) [ 0.000000] ACPI: LAPIC (acpi_id[0x06] lapic_id[0x00] disabled) [ 0.000000] ACPI: LAPIC (acpi_id[0x07] lapic_id[0x00] disabled) [ 0.000000] ACPI: LAPIC (acpi_id[0x08] lapic_id[0x00] disabled) [ 0.000000] ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1]) [ 0.000000] ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1]) [ 0.000000] ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0]) [ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl) [ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level) [ 0.000000] ACPI: IRQ0 used by override. [ 0.000000] ACPI: IRQ2 used by override. [ 0.000000] ACPI: IRQ9 used by override. [ 0.000000] Using ACPI (MADT) for SMP configuration information [ 0.000000] ACPI: HPET id: 0x8086a301 base: 0xfed00000 [ 0.000041] ACPI: Core revision 20140424 [ 0.011992] ACPI: All ACPI Tables successfully acquired [ 0.117705] PM: Registering ACPI NVS region [mem 0xdae9f000-0xdaf9efff] (1048576 bytes) [ 0.118696] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it [ 0.118697] ACPI: bus type PCI registered [ 0.118698] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5 [ 0.128081] ACPI: Added _OSI(Module Device) [ 0.128083] ACPI: Added _OSI(Processor Device) [ 0.128084] ACPI: Added _OSI(3.0 _SCP Extensions) [ 0.128085] ACPI: Added _OSI(Processor Aggregator Device) [ 0.130740] ACPI: Executed 2 blocks of module-level executable AML code [ 0.133395] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored [ 0.176677] ACPI: Dynamic OEM Table Load: [ 0.176686] ACPI: SSDT 0xFFFF880119677000 00083B (v02 PmRef Cpu0Cst 00003001 INTL 20061109) [ 0.188103] ACPI: Dynamic OEM Table Load: [ 0.188111] ACPI: SSDT 0xFFFF8801196F4C00 000303 (v02 PmRef ApIst 00003000 INTL 20061109) [ 0.198360] ACPI: Dynamic OEM Table Load: [ 0.198365] ACPI: SSDT 0xFFFF880119683C00 000119 (v02 PmRef ApCst 00003000 INTL 20061109) [ 1.044162] ACPI: Interpreter enabled [ 1.044169] ACPI Exception: AE_NOT_FOUND, While evaluating Sleep State [\_S1_] (20140424/hwxface-580) [ 1.044174] ACPI Exception: AE_NOT_FOUND, While evaluating Sleep State [\_S2_] (20140424/hwxface-580) [ 1.044188] ACPI: (supports S0 S3 S4 S5) [ 1.044189] ACPI: Using IOAPIC for interrupt routing [ 1.044217] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug [ 1.059829] acpi LNXIOBAY:00: ACPI dock station (docks/bays count: 1) [ 1.061752] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-3e]) [ 1.061757] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI] [ 1.061863] acpi PNP0A08:00: _OSC failed (AE_ERROR); disabling ASPM [ 1.063089] pci 0000:00:14.0: System wakeup disabled by ACPI [ 1.063770] pci 0000:00:1a.0: System wakeup disabled by ACPI [ 1.063975] pci 0000:00:1b.0: System wakeup disabled by ACPI [ 1.064130] pci 0000:00:1c.0: System wakeup disabled by ACPI [ 1.064285] pci 0000:00:1c.1: System wakeup disabled by ACPI [ 1.064767] pci 0000:00:1d.0: System wakeup disabled by ACPI [ 1.066116] pci 0000:03:00.0: System wakeup disabled by ACPI [ 1.075913] pci 0000:04:00.0: System wakeup disabled by ACPI [ 1.084249] ACPI: PCI Interrupt Link [LNKA] (IRQs 1 3 4 5 6 10 *11 12 14 15) [ 1.084295] ACPI: PCI Interrupt Link [LNKB] (IRQs 1 3 4 5 6 10 *11 12 14 15) [ 1.084339] ACPI: PCI Interrupt Link [LNKC] (IRQs 1 3 4 5 6 10 11 12 14 15) *7 [ 1.084382] ACPI: PCI Interrupt Link [LNKD] (IRQs 1 3 4 5 6 *10 11 12 14 15) [ 1.084426] ACPI: PCI Interrupt Link [LNKE] (IRQs 1 3 4 5 6 10 11 12 14 15) *0, disabled. [ 1.084469] ACPI: PCI Interrupt Link [LNKF] (IRQs 1 3 4 5 6 10 11 12 14 15) *0, disabled. [ 1.084512] ACPI: PCI Interrupt Link [LNKG] (IRQs 1 3 4 5 6 *10 11 12 14 15) [ 1.084555] ACPI: PCI Interrupt Link [LNKH] (IRQs 1 3 4 5 6 10 11 12 14 15) *7 [ 1.084650] ACPI: Enabled 4 GPEs in block 00 to 3F [ 1.084697] ACPI : EC: GPE = 0x17, I/O: command/status = 0x66, data = 0x62 [ 1.084845] PCI: Using ACPI for IRQ routing [ 1.092937] pnp: PnP ACPI init [ 1.092953] ACPI: bus type PNP registered [ 1.093088] system 00:00: Plug and Play ACPI device, IDs PNP0c02 (active) [ 1.093117] pnp 00:01: Plug and Play ACPI device, IDs PNP0b00 (active) [ 1.093163] system 00:02: Plug and Play ACPI device, IDs INT3f0d PNP0c02 (active) [ 1.093376] pnp 00:03: Plug and Play ACPI device, IDs PTL0001 PNP0303 (active) [ 1.093429] pnp 00:04: Plug and Play ACPI device, IDs LEN2002 PNP0f13 (active) [ 1.093568] system 00:05: Plug and Play ACPI device, IDs PNP0c02 (active) [ 1.093750] pnp: PnP ACPI: found 6 devices [ 1.093751] ACPI: bus type PNP unregistered [ 1.390198] ACPI: bus type USB registered [ 1.390643] ACPI: Thermal Zone [TZ01] (30 C) [ 1.845374] ata1.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded [ 1.845381] ata1.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out [ 1.845384] ata1.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered out [ 1.845702] ata3.00: ACPI cmd e3/00:1f:00:00:00:a0 (IDLE) succeeded [ 1.846098] ata3.00: ACPI cmd e3/00:02:00:00:00:a0 (IDLE) succeeded [ 1.846104] ata3.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered out [ 1.849262] ata1.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded [ 1.849268] ata1.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out [ 1.849272] ata1.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered out [ 1.850693] ata3.00: ACPI cmd e3/00:1f:00:00:00:a0 (IDLE) succeeded [ 1.851020] ata3.00: ACPI cmd e3/00:02:00:00:00:a0 (IDLE) succeeded [ 1.851029] ata3.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered out [ 8.640845] ACPI: Power Button [PWRB] [ 8.641078] ACPI: Lid Switch [LID0] [ 8.641143] ACPI: Power Button [PWRF] [ 9.044177] ACPI Warning: SystemIO range 0x0000000000000428-0x000000000000042f conflicts with OpRegion 0x0000000000000400-0x000000000000047f (\PMIO) (20140424/utaddress-258) [ 9.044182] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver [ 9.044185] ACPI Warning: SystemIO range 0x0000000000000540-0x000000000000054f conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GPIO) (20140424/utaddress-258) [ 9.044187] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver [ 9.044188] ACPI Warning: SystemIO range 0x0000000000000530-0x000000000000053f conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GPIO) (20140424/utaddress-258) [ 9.044190] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver [ 9.044191] ACPI Warning: SystemIO range 0x0000000000000500-0x000000000000052f conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GPIO) (20140424/utaddress-258) [ 9.044193] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver [ 9.117995] thinkpad_acpi: ThinkPad ACPI Extras v0.25 [ 9.117997] thinkpad_acpi: http://ibm-acpi.sf.net/ [ 9.117998] thinkpad_acpi: ThinkPad BIOS HEET31WW (1.12 ), EC unknown [ 9.117999] thinkpad_acpi: Lenovo ThinkPad Edge E531, model 68853YG [ 9.118524] thinkpad_acpi: Unsupported brightness interface, please contact ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx [ 9.118661] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver [ 9.118662] thinkpad_acpi: Disabling thinkpad-acpi brightness events by default... [ 9.119270] ACPI: Battery Slot [BAT0] (battery present) [ 9.119755] ACPI: AC Adapter [AC] (on-line) [ 9.121807] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is unblocked [ 9.122552] thinkpad_acpi: Console audio control enabled, mode: monitor (read only) [ 9.123727] input: ThinkPad Extra Buttons as /devices/platform/thinkpad_acpi/input/input6 [ 9.126692] ACPI Warning: SystemIO range 0x000000000000efa0-0x000000000000efbf conflicts with OpRegion 0x000000000000efa0-0x000000000000efaf (\_SB_.PCI0.SBUS.SMBI) (20140424/utaddress-258) [ 9.126697] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver [ 10.711834] ACPI: Video Device [VID] (multi-head: yes rom: no post: no) [ 34.574487] thinkpad_acpi: unknown possible thermal alarm or keyboard event received [ 34.574491] thinkpad_acpi: unhandled HKEY event 0x6060 [ 34.574492] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx [ 59.083564] Modules linked in: binfmt_misc cpufreq_stats cpufreq_conservative pci_stub cpufreq_userspace vboxpci(O) vboxnetadp(O) cpufreq_powersave vboxnetflt(O) vboxdrv(O) joydev uvcvideo videobuf2_vmalloc iTCO_wdt x86_pkg_temp_thermal intel_powerclamp videobuf2_memops intel_rapl videobuf2_core v4l2_common videodev media iTCO_vendor_support kvm_intel kvm crc32_pclmul ghash_clmulni_intel aesni_intel i915 aes_x86_64 wl(PO) lrw cfg80211 rtsx_pci_ms memstick psmouse gf128mul snd_hda_codec_hdmi evdev glue_helper ablk_helper serio_raw drm_kms_helper drm snd_hda_codec_conexant snd_hda_codec_generic cryptd shpchp pcspkr i2c_i801 snd_hda_intel i2c_algo_bit thinkpad_acpi snd_hda_controller i2c_core snd_hda_codec snd_hwdep snd_pcm snd_timer lpc_ich nvram mei_me snd mei soundcore wmi rfkill video ac battery ==== So I really don't know if that has anything to do with the high temperature or I just have to clean the fan properly (which i am about to do). Nevertheless there seems to be some message of unsupported brightness interface for the driver. Brightness works fine, either with Fn key either with xbacklight command or any other brightness setting. I sent here to you since that's what the message tells me to report. If you find this interesting and would like more info please don't hesitate to ask. I am not very proficient on anything related but I am very willing to try anything. Thanks in advance Theo ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. 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