Hi first post here... Just wanted to chime in and confirm same bug on same machine: Thinkpad x260 Processor: Intel® Core™ i7-6500U CPU @ 2.50GHz × 4 Graphics: Gallium 0.4 on llvmpipe (LLVM 3.8, 256 bits)
In order to try and fix the bug I have added the repo: http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu Before this change, the system reported Graphics: Intel Skylake HD Graphics 520 I'm running a 1 day old Ubuntu 16.04. I have experienced this crash on the stock kernel, 4.6.9 and 4.6.3 My steps to reproduce: * plug in HDMI to a 4K external display and set display to full resolution (this will only have a frame rate of 30Hz due to a limitation in HDMI standard) * turn off laptop monitor * plug in DP to *the same* external display * Set new configuration where HDMI if off and DP is on. (this will be at 60Hz) * screen goes blank on both HDMI and DP source. reverts to last configuration because of crash. I believe it is the combination of 4K display in full resolution *and* 60hz. This would be why the crash is only seen with DP at full resolution. last crash report with kernel 4.6.3: Jul 06 19:32:14 emil-workpad kernel: ------------[ cut here ]------------ Jul 06 19:32:14 emil-workpad kernel: WARNING: CPU: 0 PID: 986 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_display.c:13938 skl_max_scale.part.99+0x6d/0x80 [i915] Jul 06 19:32:14 emil-workpad kernel: WARN_ON_ONCE(!crtc_clock || cdclk < crtc_clock) Jul 06 19:32:14 emil-workpad kernel: Modules linked in: Jul 06 19:32:14 emil-workpad kernel: rfcomm bnep arc4 snd_soc_skl snd_soc_skl_ipc snd_hda_codec_hdmi snd_soc_sst_ipc snd_soc_sst_dsp snd_hda_ext_core snd_hda_codec_realtek snd_hda_codec_generic snd_soc_sst_match intel_rapl snd_soc_core x86_pkg_temp_thermal snd_compress inte Jul 06 19:32:14 emil-workpad kernel: hid_lenovo usbhid hid rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel i915 aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd i2c_algo_bit drm_kms_helper syscopyarea sysfillrect e1000e sysimgblt psmouse f Jul 06 19:32:14 emil-workpad kernel: CPU: 0 PID: 986 Comm: Xorg Tainted: G W 4.6.3-040603-generic #201606241434 Jul 06 19:32:14 emil-workpad kernel: Hardware name: LENOVO 20F6006XMD/20F6006XMD, BIOS R02ET44W (1.17 ) 01/25/2016 Jul 06 19:32:14 emil-workpad kernel: 0000000000000286 00000000eeed4400 ffff8802148b7a50 ffffffff813f3373 Jul 06 19:32:14 emil-workpad kernel: ffff8802148b7aa0 0000000000000000 ffff8802148b7a90 ffffffff8108293b Jul 06 19:32:14 emil-workpad kernel: 00003672c02dada0 ffff8802183dba80 ffff880035c4e800 ffff8800b29cb000 Jul 06 19:32:14 emil-workpad kernel: Call Trace: Jul 06 19:32:14 emil-workpad kernel: [<ffffffff813f3373>] dump_stack+0x63/0x90 Jul 06 19:32:14 emil-workpad kernel: [<ffffffff8108293b>] __warn+0xcb/0xf0 Jul 06 19:32:14 emil-workpad kernel: [<ffffffff810829bf>] warn_slowpath_fmt+0x5f/0x80 Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc02a846d>] skl_max_scale.part.99+0x6d/0x80 [i915] Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc02a8540>] intel_check_primary_plane+0xc0/0xe0 [i915] Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc02cf66a>] ? intel_ddi_compute_config+0x5a/0xc0 [i915] Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc029a3fe>] intel_plane_atomic_check+0x12e/0x1f0 [i915] Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc017eff8>] drm_atomic_helper_check_planes+0x48/0x1d0 [drm_kms_helper] Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc02b4d02>] intel_atomic_check+0x172/0x830 [i915] Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0084e11>] drm_atomic_check_only+0x181/0x600 [drm] Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0084657>] ? drm_atomic_set_crtc_for_connector+0x57/0xe0 [drm] Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc00852a7>] drm_atomic_commit+0x17/0x60 [drm] Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc018103a>] drm_atomic_helper_set_config+0x7a/0xb0 [drm_kms_helper] Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0074b52>] drm_mode_set_config_internal+0x62/0x100 [drm] Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0078af0>] drm_mode_setcrtc+0x3e0/0x500 [drm] Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0069aa2>] drm_ioctl+0x152/0x540 [drm] Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0078710>] ? drm_mode_setplane+0x1b0/0x1b0 [drm] Jul 06 19:32:14 emil-workpad kernel: [<ffffffff812379f1>] do_vfs_ioctl+0xa1/0x5b0 Jul 06 19:32:14 emil-workpad kernel: [<ffffffff81090961>] ? __set_task_blocked+0x41/0xa0 Jul 06 19:32:14 emil-workpad kernel: [<ffffffff810932e6>] ? __set_current_blocked+0x36/0x60 Jul 06 19:32:14 emil-workpad kernel: [<ffffffff81237f79>] SyS_ioctl+0x79/0x90 Jul 06 19:32:14 emil-workpad kernel: [<ffffffff81845ab6>] entry_SYSCALL_64_fastpath+0x1e/0xa8 Jul 06 19:32:14 emil-workpad kernel: ---[ end trace dce1bcd4b56b9a53 ]--- Jul 06 19:32:14 emil-workpad kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun -- 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/1597267 Title: ThinkPad X260 connecting external DisplayPort hangs system Status in linux package in Ubuntu: Triaged Bug description: Running Ubuntu 16.04 on a Lenovo ThinkPad X260 with Intel Skylake HD Graphics 520, connecting an external monitor to the DisplayPort connector causes the system to quickly hang. The system stops responding to network pings, cannot switch consoles, and needs a hard reboot. The external monitor does work when using a text console, and does not always hang in the LightDM login screen, but starting up a desktop session will always hang. This originally happened using a ThinkPad dock, and I tested it further using an external DP monitor. This happens on 4.4.0-28-generic as well as mainline 4.6.3-040603-generic and 4.7.0-040700rc5-generic; they all hang in a similar fashion. I have attached a journalctl log from running 4.7.0-040700rc5-generic and connecting the DP monitor while in a text console, before switching to the graphical console and logging in. The system hangs after a series of: kernel: WARNING: CPU: 3 PID: 2319 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_pm.c:3647 skl_update_other_pipe_wm+0x15d/0x170 [i915] kernel: WARNING: CPU: 3 PID: 4418 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_display.c:13957 skl_max_scale.part.108+0x69/0x70 [i915] kernel: [drm:gen8_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun The first warnings come immediately when connecting, and others when switching consoles and logging in. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-28-generic 4.4.0-28.47 ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13 Uname: Linux 4.4.0-28-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: terom 1903 F.... pulseaudio CurrentDesktop: Unity Date: Wed Jun 29 13:03:18 2016 InstallationDate: Installed on 2016-06-26 (2 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) MachineType: LENOVO 20F6007RGE ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-28-generic root=UUID=6636a3bb-262e-4ab2-ae81-d9388e3f7684 ro rootflags=subvol=@ quiet splash RelatedPackageVersions: linux-restricted-modules-4.4.0-28-generic N/A linux-backports-modules-4.4.0-28-generic N/A linux-firmware 1.157.1 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 06/01/2016 dmi.bios.vendor: LENOVO dmi.bios.version: R02ET48W (1.21 ) dmi.board.asset.tag: Not Available dmi.board.name: 20F6007RGE dmi.board.vendor: LENOVO dmi.board.version: SDK0J40705 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrR02ET48W(1.21):bd06/01/2016:svnLENOVO:pn20F6007RGE:pvrThinkPadX260:rvnLENOVO:rn20F6007RGE:rvrSDK0J40705WIN:cvnLENOVO:ct10:cvrNone: dmi.product.name: 20F6007RGE dmi.product.version: ThinkPad X260 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1597267/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
