[Bug 80930] [regression] WARNING ... i965_enable_backlight ... backlight already enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80930

--- Comment #7 from Scot Doyle <lkml14 at scotdoyle.com> ---
Similar output after each suspend/resume cycle on Acer C720 and Toshiba CB35.

[  301.551363] ------------[ cut here ]------------
[  301.551386] WARNING: CPU: 0 PID: 71 at
drivers/gpu/drm/i915/intel_panel.c:804 pch_enable_backlight+0x1ba/0x200
[i915]()
[  301.551387] cpu backlight already enabled
[  301.551423] Modules linked in: snd_hda_codec_hdmi tpm_infineon joydev
mousedev uas usb_storage coretemp hwmon intel_rapl arc4 x86_pkg_temp_thermal
intel_powerclamp ath9k kvm_intel ath9k_common ath9k_hw kvm cyapa ath iTCO_wdt
iTCO_vendor_support mac80211 crct10dif_pclmul crc32_pclmul crc32c_intel
ghash_clmulni_intel cryptd microcode evdev chromeos_laptop mac_hid cfg80211
serio_raw pcspkr rfkill snd_hda_codec_realtek fan i2c_i801 thermal
snd_hda_codec_generic ac i915 battery snd_hda_intel snd_hda_controller tpm_tis
tpm snd_hda_codec drm_kms_helper snd_hwdep drm snd_pcm video gpio_lynxpoint
snd_timer 8250_dw dw_dmac lpc_ich intel_gtt snd i2c_algo_bit
i2c_designware_platform i2c_designware_pci i2c_designware_core soundcore
spi_pxa2xx_platform shpchp dw_dmac_pci dw_dmac_core button processor
[  301.551435]  ext4 crc16 mbcache jbd2 sd_mod crc_t10dif crct10dif_common
atkbd libps2 ahci libahci libata scsi_mod i8042 serio xhci_hcd usbcore
usb_common sdhci_acpi sdhci led_class mmc_core
[  301.551439] CPU: 0 PID: 71 Comm: kworker/u4:2 Tainted: G           O  
3.17.0-rc1 #1
[  301.551440] Hardware name: Toshiba Leon, BIOS          12/04/2013
[  301.551445] Workqueue: events_unbound async_run_entry_fn
[  301.551448]  0000000000000000 000000004635ec02 ffff880037dd7970
ffffffff8153db1c
[  301.551450]  ffff880037dd79b8 ffff880037dd79a8 ffffffff8106fbdd
ffff880037f00000
[  301.551452]  ffff880073c61400 0000000000000003 0000000080000000
ffff880073c16b38
[  301.551453] Call Trace:
[  301.551459]  [<ffffffff8153db1c>] dump_stack+0x4d/0x6f
[  301.551463]  [<ffffffff8106fbdd>] warn_slowpath_common+0x7d/0xa0
[  301.551465]  [<ffffffff8106fc5c>] warn_slowpath_fmt+0x5c/0x80
[  301.551479]  [<ffffffffa054ce9a>] pch_enable_backlight+0x1ba/0x200 [i915]
[  301.551490]  [<ffffffffa054d604>] intel_panel_enable_backlight+0xa4/0x100
[i915]
[  301.551501]  [<ffffffffa053e6a4>] intel_edp_backlight_on+0x54/0x140 [i915]
[  301.551512]  [<ffffffffa0536db3>] intel_enable_ddi+0xb3/0x100 [i915]
[  301.551524]  [<ffffffffa0521e79>] haswell_crtc_enable+0x599/0xa70 [i915]
[  301.551536]  [<ffffffffa04ec357>] ? i915_gem_object_ggtt_unpin+0x47/0x90
[i915]
[  301.551548]  [<ffffffffa051c32a>] __intel_set_mode+0x87a/0x16d0 [i915]
[  301.551559]  [<ffffffffa03a364e>] ? drm_ut_debug_printk+0x6e/0x90 [drm]
[  301.551571]  [<ffffffffa0526b08>] intel_modeset_setup_hw_state+0x878/0xd50
[i915]
[  301.551583]  [<ffffffffa0509a10>] ? hsw_write64+0x150/0x150 [i915]
[  301.551590]  [<ffffffffa03b905f>] ? drm_modeset_lock+0x2f/0xd0 [drm]
[  301.551596]  [<ffffffffa03b9149>] ? drm_modeset_lock_all_crtcs+0x49/0x70
[drm]
[  301.551603]  [<ffffffffa04c23a9>] __i915_drm_thaw+0x159/0x1d0 [i915]
[  301.551611]  [<ffffffffa04c2cd8>] i915_resume+0x28/0x50 [i915]
[  301.551619]  [<ffffffffa04c2d15>] i915_pm_resume+0x15/0x20 [i915]
[  301.551623]  [<ffffffff812e93c4>] pci_pm_resume+0x64/0xb0
[  301.551626]  [<ffffffff812e9360>] ? pci_pm_thaw+0xa0/0xa0
[  301.551630]  [<ffffffff813b925c>] dpm_run_callback+0x4c/0x150
[  301.551633]  [<ffffffff813b9e76>] device_resume+0xd6/0x200
[  301.551636]  [<ffffffff813b9fbd>] async_resume+0x1d/0x50
[  301.551639]  [<ffffffff81090267>] async_run_entry_fn+0x37/0x130
[  301.551642]  [<ffffffff81088273>] process_one_work+0x173/0x410
[  301.551645]  [<ffffffff8108881b>] worker_thread+0x6b/0x4a0
[  301.551647]  [<ffffffff810887b0>] ? init_pwq.part.22+0x10/0x10
[  301.551649]  [<ffffffff8108d79a>] kthread+0xea/0x100
[  301.551652]  [<ffffffff8108d6b0>] ? kthread_create_on_node+0x1b0/0x1b0
[  301.551655]  [<ffffffff81543a3c>] ret_from_fork+0x7c/0xb0
[  301.551657]  [<ffffffff8108d6b0>] ? kthread_create_on_node+0x1b0/0x1b0
[  301.551659] ---[ end trace 649897977063d845 ]---

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