Jcat-l, 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support/product/latitude-e6540-laptop/drivers/advanced an update to your computer's buggy and outdated BIOS is available (A16). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything?
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: 1) Please provide the output of the following terminal command: sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date 2) Please make a comment specifically advising on if there was an improvement or not. 3) If the issue is still reproducible, please mark this report Status Confirmed. Otherwise, please mark this as Invalid. Thank you for your understanding. ** Tags added: bios-outdated-a16 ** Changed in: linux (Ubuntu) Importance: Undecided =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/1522094 Title: WARNING: CPU: 0 PID: 233 at /build/linux-lts-vivid-pTjnAT/linux-lts- vivid-3.19.0/drivers/gpu/drm/i915/intel_crt.c:145 hsw_crt_pre_enable+0x7f/0x90 [i915]() Status in linux package in Ubuntu: Incomplete Bug description: When I connect a monitor the VGA port on the laptop - this is found in dmesg, and some of the kernel modules linked in become unstable [ btrfs for instance, if it's in use]. [ 2.962400] ------------[ cut here ]------------ [ 2.962424] WARNING: CPU: 0 PID: 233 at /build/linux-lts-vivid-pTjnAT/linux-lts-vivid-3.19.0/drivers/gpu/drm/i915/intel_crt.c:145 hsw_crt_pre_enable+0x7f/0x90 [i915]() [ 2.962425] SPLL already enabled [ 2.962426] Modules linked in: uas usb_storage hid_generic usbhid hid i915 psmouse i2c_algo_bit e1000e drm_kms_helper ahci libahci sdhci_pci drm ptp pps_core pata_acpi wmi sdhci_acpi video sdhci [ 2.962437] CPU: 0 PID: 233 Comm: plymouthd Not tainted 3.19.0-37-generic #42~14.04.1-Ubuntu [ 2.962438] Hardware name: Dell Inc. Latitude E6540/0PXPYJ, BIOS A15 05/19/2015 [ 2.962439] ffffffffc02fd7f8 ffff880220d23ab8 ffffffff817af92b 0000000000003a7a [ 2.962440] ffff880220d23b08 ffff880220d23af8 ffffffff81074e0a 0000000000000046 [ 2.962442] ffff880035fb0000 ffff88003615eb60 ffff880035f8f400 ffff88003615e800 [ 2.962444] Call Trace: [ 2.962449] [<ffffffff817af92b>] dump_stack+0x45/0x57 [ 2.962452] [<ffffffff81074e0a>] warn_slowpath_common+0x8a/0xc0 [ 2.962453] [<ffffffff81074e86>] warn_slowpath_fmt+0x46/0x50 [ 2.962464] [<ffffffffc02b601f>] hsw_crt_pre_enable+0x7f/0x90 [i915] [ 2.962475] [<ffffffffc02a1a7c>] haswell_crtc_enable+0x3fc/0xaf0 [i915] [ 2.962485] [<ffffffffc029f1a2>] __intel_set_mode+0x872/0xc60 [i915] [ 2.962495] [<ffffffffc02a5af2>] intel_crtc_set_config+0x9e2/0xf60 [i915] [ 2.962506] [<ffffffffc010382f>] drm_mode_set_config_internal+0x6f/0x110 [drm] [ 2.962511] [<ffffffffc019e5c8>] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper] [ 2.962515] [<ffffffffc01a04e9>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper] [ 2.962525] [<ffffffffc02b31ee>] intel_fbdev_restore_mode+0x1e/0x50 [i915] [ 2.962536] [<ffffffffc02d787e>] i915_driver_lastclose+0xe/0x20 [i915] [ 2.962541] [<ffffffffc00f6c4e>] drm_lastclose+0x2e/0x130 [drm] [ 2.962546] [<ffffffffc00f7088>] drm_release+0x338/0x540 [drm] [ 2.962549] [<ffffffff811ee077>] __fput+0xe7/0x220 [ 2.962551] [<ffffffff811ee1fe>] ____fput+0xe/0x10 [ 2.962553] [<ffffffff81091e3c>] task_work_run+0xac/0xd0 [ 2.962556] [<ffffffff81015007>] do_notify_resume+0x97/0xb0 [ 2.962558] [<ffffffff817b762f>] int_signal+0x12/0x17 [ 2.962559] ---[ end trace b6b778d930eaeda7 ]--- This is the lts-vivid kernel. downgrading to the lts-utopic kernel fixes the issue. I tried the wily-lts, same issue. I've also tried to recent kernels in http://kernel.ubuntu.com/~kernel- ppa : linux-image-4.3.0-040300-generic_4.3.0-040300 is still broken linux-image-4.4.0-040400rc3-generic_4.4.0-040400rc3.201511300321 works fine! :) --- ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: jcat 2559 F.... pulseaudio /dev/snd/controlC1: jcat 2559 F.... pulseaudio CurrentDesktop: GNOME DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=UUID=b338325d-c293-4b5b-ab0a-542a7f02236f InstallationDate: Installed on 2015-11-25 (8 days ago) InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) MachineType: Dell Inc. Latitude E6540 NonfreeKernelModules: fglrx Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-39-generic.efi.signed root=UUID=8c468c94-323c-4526-b3a2-e1eddacbed42 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.19.0-39.44~14.04.1-generic 3.19.8-ckt9 RelatedPackageVersions: linux-restricted-modules-3.19.0-39-generic N/A linux-backports-modules-3.19.0-39-generic N/A linux-firmware 1.127.19 Tags: trusty Uname: Linux 3.19.0-39-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 05/19/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: A15 dmi.board.name: 0PXPYJ dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA15:bd05/19/2015:svnDellInc.:pnLatitudeE6540:pvr01:rvnDellInc.:rn0PXPYJ:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E6540 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. 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