Description of problem: This problem occured after a reboot initiated by a system software update by gnome-software. There was no apparent problem except not much appeared to happen between the first and second reboot. During the entire process the lid was closed and an external monitor/keyboard/mouse was attached. Additional info: reporter: libreport-2.2.3 WARNING: CPU: 0 PID: 299 at drivers/gpu/drm/i915/intel_panel.c:639 pch_enable_backlight+0x1ba/0x200 [i915]() cpu backlight already enabled Modules linked in: uas usb_storage i915(+) crc32_pclmul i2c_algo_bit drm_kms_helper crc32c_intel drm ghash_clmulni_intel i2c_core video CPU: 0 PID: 299 Comm: systemd-udevd Not tainted 3.15.7-200.fc20.x86_64 #1 Hardware name: Apple Inc. MacBookAir4,2/Mac-742912EFDBEE19B3, BIOS MBA41.88Z.0077.B0F.1201241549 01/24/2012 0000000000000000 0000000077d48d24 ffff880167ab3248 ffffffff816ef92e ffff880167ab3290 ffff880167ab3280 ffffffff8108933d ffff88003f930000 ffff880167079c00 0000000000000000 0000000080000000 ffff880167fdbb48 Call Trace: [<ffffffff816ef92e>] dump_stack+0x45/0x56 [<ffffffff8108933d>] warn_slowpath_common+0x7d/0xa0 [<ffffffff810893bc>] warn_slowpath_fmt+0x5c/0x80 [<ffffffffa012ac6a>] pch_enable_backlight+0x1ba/0x200 [i915] [<ffffffffa012b312>] intel_panel_enable_backlight+0x82/0xd0 [i915] [<ffffffffa012076f>] intel_edp_backlight_on+0xcf/0x130 [i915] [<ffffffffa012139e>] g4x_enable_dp+0x1e/0x30 [i915] [<ffffffffa010250b>] ironlake_crtc_enable+0x34b/0xd20 [i915] [<ffffffff81359e6a>] ? delay_tsc+0x4a/0x80 [<ffffffffa0104947>] __intel_set_mode+0x827/0x1640 [i915] [<ffffffffa0107e16>] intel_set_mode+0x16/0x30 [i915] [<ffffffffa0108ced>] intel_crtc_set_config+0x8ed/0xdc0 [i915] [<ffffffffa00485a1>] drm_mode_set_config_internal+0x61/0xf0 [drm] [<ffffffffa00a8723>] drm_fb_helper_restore_fbdev_mode+0xb3/0xe0 [drm_kms_helper] [<ffffffffa00aa341>] drm_fb_helper_set_par+0x31/0x80 [drm_kms_helper] [<ffffffff813b3bd4>] fbcon_init+0x4f4/0x570 [<ffffffff8142fc28>] visual_init+0xb8/0x120 [<ffffffff81432353>] do_bind_con_driver+0x163/0x330 [<ffffffff81432b04>] do_take_over_console+0x114/0x1c0 [<ffffffff813af2c3>] do_fbcon_takeover+0x63/0xd0 [<ffffffff813b466d>] fbcon_event_notify+0x68d/0x7e0 [<ffffffff816fa8bc>] notifier_call_chain+0x4c/0x70 [<ffffffff810b0e7d>] __blocking_notifier_call_chain+0x4d/0x70 [<ffffffff810b0eb6>] blocking_notifier_call_chain+0x16/0x20 [<ffffffff813bb0ab>] fb_notifier_call_chain+0x1b/0x20 [<ffffffff813bd106>] register_framebuffer+0x1f6/0x340 [<ffffffffa00aa6be>] drm_fb_helper_initial_config+0x32e/0x500 [drm_kms_helper] [<ffffffffa00ef3b6>] ? gen6_write32+0x66/0x100 [i915] [<ffffffffa0113f8f>] intel_fbdev_initial_config+0x1f/0x30 [i915] [<ffffffffa013530a>] i915_driver_load+0xeba/0xf40 [i915] [<ffffffff81350db8>] ? kobject_uevent_env+0x178/0x690 [<ffffffff81459cf7>] ? get_device+0x17/0x30 [<ffffffff8145f6f5>] ? klist_class_dev_get+0x15/0x20 [<ffffffff816dffe2>] ? klist_add_tail+0x32/0x40 [<ffffffff8145b679>] ? device_add+0x219/0x630 [<ffffffffa0046357>] ? drm_sysfs_device_add+0xd7/0x120 [drm] [<ffffffffa004272d>] drm_dev_register+0xad/0x100 [drm] [<ffffffffa0045309>] drm_get_pci_dev+0x89/0x200 [drm] [<ffffffffa00b35eb>] i915_pci_probe+0x3b/0x60 [i915] [<ffffffff8138eca5>] local_pci_probe+0x45/0xa0 [<ffffffff81390099>] pci_device_probe+0xf9/0x150 [<ffffffff8145ea0d>] driver_probe_device+0x12d/0x3d0 [<ffffffff8145ed83>] __driver_attach+0x93/0xa0 [<ffffffff8145ecf0>] ? __device_attach+0x40/0x40 [<ffffffff8145c833>] bus_for_each_dev+0x73/0xc0 [<ffffffff8145e3be>] driver_attach+0x1e/0x20 [<ffffffff8145df70>] bus_add_driver+0x180/0x250 [<ffffffffa0181000>] ? 0xffffffffa0180fff [<ffffffff8145f404>] driver_register+0x64/0xf0 [<ffffffffa0181000>] ? 0xffffffffa0180fff [<ffffffff8138e63c>] __pci_register_driver+0x4c/0x50 [<ffffffffa004558a>] drm_pci_init+0x10a/0x140 [drm] [<ffffffffa0181000>] ? 0xffffffffa0180fff [<ffffffffa018106a>] i915_init+0x6a/0x6c [i915] [<ffffffff8100216a>] do_one_initcall+0xfa/0x1b0 [<ffffffff81059873>] ? set_memory_nx+0x43/0x50 [<ffffffff81104082>] load_module+0x1d92/0x25e0 [<ffffffff810ffda0>] ? store_uevent+0x70/0x70 [<ffffffff811ec5d0>] ? kernel_read+0x50/0x80 [<ffffffff81104a86>] SyS_finit_module+0xa6/0xd0 [<ffffffff816ff969>] system_call_fastpath+0x16/0x1b
Created attachment 926523 [details] File: dmesg
*** Bug 1112365 has been marked as a duplicate of this bug. ***
*** Bug 1129109 has been marked as a duplicate of this bug. ***
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