Following on 4.2.0-generic (16.04 does not boot at all. At least most of the time):
[ 601.848346] WARNING: CPU: 0 PID: 50 at /build/linux-lts-wily-Ejb_ce/linux-lts-wily-4.2.0/drivers/gpu/drm/i915/intel_pm.c:3404 skl_update_other_pipe_wm+0x205/0x210 [i915]() [ 601.848349] WARN_ON(!wm_changed) [ 601.848390] Modules linked in: bridge stp llc intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm i915 crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd drm_kms_helper binfmt_misc shpchp input_leds drm mei_me mei nls_iso8859_1 8250_fintek i2c_hid video pinctrl_sunrisepoint intel_lpss_acpi pinctrl_intel intel_lpss acpi_als wmi kfifo_buf industrialio acpi_pad lp mac_hid parport hid_generic igb e1000e i2c_algo_bit dca usbhid ptp ahci hid pps_core libahci [ 601.848395] CPU: 0 PID: 50 Comm: kworker/0:1 Tainted: G W 4.2.0-42-generic #49~14.04.1-Ubuntu [ 601.848397] Hardware name: Default string Default string/SKYBAY, BIOS 5.11 09/25/2017 [ 601.848406] Workqueue: events console_callback [ 601.848411] 0000000000000000 ffff88042f0a3618 ffffffff817bc281 ffff88042f0a3668 [ 601.848414] ffffffffc0385370 ffff88042f0a3658 ffffffff8107998a ffff88042f0a3790 [ 601.848418] ffff88042ba23000 ffff88042f0a3700 ffff88042f0a37b4 ffff88042ba22000 [ 601.848419] Call Trace: [ 601.848426] [<ffffffff817bc281>] dump_stack+0x63/0x81 [ 601.848435] [<ffffffff8107998a>] warn_slowpath_common+0x8a/0xc0 [ 601.848440] [<ffffffff81079a06>] warn_slowpath_fmt+0x46/0x50 [ 601.848468] [<ffffffffc02c8125>] skl_update_other_pipe_wm+0x205/0x210 [i915] [ 601.848497] [<ffffffffc02c8326>] skl_update_wm+0x1f6/0x810 [i915] [ 601.848501] [<ffffffff817bf878>] ? __schedule+0x358/0x930 [ 601.848530] [<ffffffffc02c943e>] intel_update_watermarks+0x1e/0x30 [i915] [ 601.848578] [<ffffffffc032c667>] haswell_crtc_disable+0x167/0x330 [i915] [ 601.848623] [<ffffffffc032edbe>] intel_crtc_control+0x5e/0x110 [i915] [ 601.848662] [<ffffffffc032eece>] intel_crtc_update_dpms+0x5e/0x80 [i915] [ 601.848703] [<ffffffffc033410e>] intel_connector_dpms+0x5e/0x70 [i915] [ 601.848719] [<ffffffffc02260f5>] drm_fb_helper_dpms.isra.6+0x95/0xe0 [drm_kms_helper] [ 601.848730] [<ffffffffc0226172>] drm_fb_helper_blank+0x32/0x80 [drm_kms_helper] [ 601.848773] [<ffffffffc0341eaa>] intel_fbdev_blank+0x1a/0x60 [i915] [ 601.848779] [<ffffffff81098bb6>] ? blocking_notifier_call_chain+0x16/0x20 [ 601.848784] [<ffffffff814291e7>] fb_blank+0x57/0xb0 [ 601.848789] [<ffffffff814207ee>] fbcon_blank+0x1fe/0x2b0 [ 601.848794] [<ffffffff810ae0b2>] ? dequeue_entity+0x152/0x690 [ 601.848799] [<ffffffff8141e275>] ? get_color.isra.15+0x35/0x110 [ 601.848804] [<ffffffff810e1818>] ? lock_timer_base.isra.35+0x58/0x80 [ 601.848807] [<ffffffff810e1abf>] ? try_to_del_timer_sync+0x4f/0x70 [ 601.848812] [<ffffffff814aeddd>] do_blank_screen+0x1bd/0x260 [ 601.848817] [<ffffffff814b1208>] console_callback+0x68/0x150 [ 601.848819] [<ffffffff817bf878>] ? __schedule+0x358/0x930 [ 601.848826] [<ffffffff81091d40>] process_one_work+0x150/0x3f0 [ 601.848831] [<ffffffff810924ba>] worker_thread+0x11a/0x470 [ 601.848837] [<ffffffff810923a0>] ? rescuer_thread+0x310/0x310 [ 601.848840] [<ffffffff81097a99>] kthread+0xc9/0xe0 [ 601.848845] [<ffffffff810979d0>] ? kthread_create_on_node+0x1c0/0x1c0 [ 601.848849] [<ffffffff817c3b1f>] ret_from_fork+0x3f/0x70 [ 601.848853] [<ffffffff810979d0>] ? kthread_create_on_node+0x1c0/0x1c0 [ 601.848856] ---[ end trace 3cea3aacb2b553b0 ]--- -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1523088 Title: WARN_ON(!wm_changed) warning and stacktrace in kernel log To manage notifications about this bug go to: https://bugs.launchpad.net/xorg-server/+bug/1523088/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
