Hatem MASMOUDI, thank you for reporting this and helping make Ubuntu better.
As per http://www.dell.com/support/home/us/en/19/product- support/product/latitude-e5540-laptop/drivers an update to your computer's buggy and outdated BIOS is available (A13). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything? If it doesn't, could you please both specify what happened, and provide the output of the following terminal command: sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette . Please note your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. As well, you don't have to create a new bug report. Once the BIOS is updated, if the problem is still reproducible, and the information above is provided, then please mark this report Status Confirmed. Otherwise, please mark this as Invalid. Thank you for your understanding. ** Changed in: linux (Ubuntu) Importance: Undecided => Low ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1509788 Title: ------------[ cut here ]------------ WARNING: CPU: 3 PID: 783 at /build/linux- AxjFAn/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]() Status in linux package in Ubuntu: Incomplete Bug description: more than once during boot: [ 11.973743] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0) [ 11.973746] ------------[ cut here ]------------ [ 11.973758] WARNING: CPU: 3 PID: 783 at /build/linux-AxjFAn/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]() [ 11.973759] pipe state doesn't match! [ 11.973760] Modules linked in: arc4 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media dell_wmi sparse_keymap btusb btrtl btbcm btintel bluetooth iwlmvm mac80211 dell_laptop dcdbas dell_smm_hwmon intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd input_leds joydev serio_raw iwlwifi cfg80211 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core 8250_fintek snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer snd mei_me lpc_ich mei shpchp soundcore mac_hid dell_rbtn dell_smo8800 parport_pc ppdev lp parport autofs4 i915 psmouse ahci [ 11.973793] libahci i2c_algo_bit e1000e drm_kms_helper sdhci_pci drm ptp sdhci pps_core wmi video [ 11.973799] CPU: 3 PID: 783 Comm: Xorg Tainted: G W 4.2.0-16-generic #19-Ubuntu [ 11.973800] Hardware name: Dell Inc. Latitude E5540/077XV9, BIOS A12 05/19/2015 [ 11.973802] 0000000000000000 00000000aee23105 ffff8800db8c77c8 ffffffff817e8c09 [ 11.973804] 0000000000000000 ffff8800db8c7820 ffff8800db8c7808 ffffffff8107b3c6 [ 11.973805] ffff8800db8c7848 ffff8800db8c78b0 ffff8802116f7800 0000000000000001 [ 11.973807] Call Trace: [ 11.973811] [<ffffffff817e8c09>] dump_stack+0x45/0x57 [ 11.973815] [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0 [ 11.973817] [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70 [ 11.973828] [<ffffffffc01eebc1>] ? intel_pipe_config_compare+0xb31/0xc60 [i915] [ 11.973837] [<ffffffffc01eefb5>] check_crtc_state+0x2c5/0x440 [i915] [ 11.973849] [<ffffffffc0202d6d>] intel_modeset_check_state+0x21d/0x6d0 [i915] [ 11.973859] [<ffffffffc0203f27>] intel_crtc_set_config+0x4c7/0x580 [i915] [ 11.973869] [<ffffffffc0054ee5>] ? drm_mode_create+0x25/0x60 [drm] [ 11.973877] [<ffffffffc004e4c6>] drm_mode_set_config_internal+0x66/0x100 [drm] [ 11.973884] [<ffffffffc0052b29>] drm_mode_setcrtc+0x3e9/0x500 [drm] [ 11.973889] [<ffffffffc0043495>] drm_ioctl+0x125/0x610 [drm] [ 11.973896] [<ffffffffc0052740>] ? drm_mode_setplane+0x1b0/0x1b0 [drm] [ 11.973899] [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480 [ 11.973902] [<ffffffff81087f61>] ? __set_task_blocked+0x41/0xa0 [ 11.973904] [<ffffffff81210b09>] SyS_ioctl+0x79/0x90 [ 11.973907] [<ffffffff8108ab8e>] ? SyS_rt_sigprocmask+0x8e/0xc0 [ 11.973909] [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75 [ 11.973911] ---[ end trace 1bf4132a5846f07f ]--- ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: linux-image-4.2.0-16-generic 4.2.0-16.19 [modified: boot/vmlinuz-4.2.0-16-generic] ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3 Uname: Linux 4.2.0-16-generic x86_64 ApportVersion: 2.19.1-0ubuntu3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: hmasmoudi 1040 F.... pulseaudio /dev/snd/controlC1: hmasmoudi 1040 F.... pulseaudio CurrentDesktop: KDE Date: Sun Oct 25 12:26:46 2015 HibernationDevice: RESUME=UUID=99aea242-c239-4886-b584-3bf53b883f00 InstallationDate: Installed on 2015-10-24 (0 days ago) InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) MachineType: Dell Inc. Latitude E5540 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=c6047f35-c07b-4022-82ed-964064e65c14 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.2.0-16-generic N/A linux-backports-modules-4.2.0-16-generic N/A linux-firmware 1.149 SourcePackage: linux UdevLog: Error: [Errno 2] Aucun fichier ou dossier de ce type: '/var/log/udev' UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/19/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: A12 dmi.board.name: 077XV9 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA12:bd05/19/2015:svnDellInc.:pnLatitudeE5540:pvr01:rvnDellInc.:rn077XV9:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E5540 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. 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