[Bug 85977] [BYT] Backlight support for Dell Venue 8 Pro

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85977

--- Comment #10 from Michael Shigorin <mike at altlinux.org> ---
Does anyone else get this BUG with i915.force_backlight_pmic=1?
(setting it back to 0 makes this disappear)

BUG: scheduling while atomic: Xorg/589/0x00000002
[...]
[  321.034563] Call Trace:
[  321.034580]  [<ffffffff8159679f>] dump_stack+0x4e/0x71
[  321.034595]  [<ffffffff8159386e>] __schedule_bug+0x45/0x53
[  321.034609]  [<ffffffff81599518>] __schedule+0x848/0x860
[  321.034623]  [<ffffffff81599694>] schedule+0x24/0x70
[  321.034637]  [<ffffffff8159c57c>] schedule_hrtimeout_range_clock+0x11c/0x150
[  321.034653]  [<ffffffff810d1a10>] ? update_rmtp+0x70/0x70
[  321.034669]  [<ffffffff810d24bf>] ? hrtimer_start_range_ns+0xf/0x20
[  321.034684]  [<ffffffff8159c5be>] schedule_hrtimeout_range+0xe/0x10
[  321.034698]  [<ffffffff810cf11b>] usleep_range+0x3b/0x40
[  321.034728]  [<ffffffffa002314f>] __i2c_dw_enable+0x2f/0xa0
[i2c_designware_core]
[  321.034756]  [<ffffffffa0023c7c>] i2c_dw_xfer+0x1bc/0x540
[i2c_designware_core]
[  321.034772]  [<ffffffff8144ac6d>] ? __i2c_transfer+0x6d/0x280
[  321.034786]  [<ffffffff8144ac6d>] __i2c_transfer+0x6d/0x280
[  321.034801]  [<ffffffff8144b530>] i2c_transfer+0x50/0xb0
[  321.034815]  [<ffffffff8144bbda>] i2c_master_send+0x3a/0x50
[  321.034831]  [<ffffffff81413635>] regmap_i2c_write+0x15/0x40
[  321.034845]  [<ffffffff8140f2cd>] _regmap_raw_write+0x76d/0x7a0
[  321.034860]  [<ffffffff8140f4a1>] _regmap_bus_raw_write+0x61/0x90
[  321.034874]  [<ffffffff8140e39a>] _regmap_write+0x7a/0x150
[  321.034888]  [<ffffffff8141013a>] regmap_write+0x4a/0x70
[  321.034904]  [<ffffffff814255f1>] intel_soc_pmic_writeb+0x21/0x30
[  321.034999]  [<ffffffffa042d296>] vlv_pmic_disable_backlight+0x26/0x30
[i915]
[  321.035089]  [<ffffffffa042e1c6>] intel_panel_disable_backlight+0x96/0xc0
[i915]
[  321.035176]  [<ffffffffa0423b17>] intel_dsi_post_disable+0x57/0x500 [i915]
[  321.035260]  [<ffffffffa03f7789>] ? intel_disable_pipe+0x129/0x2f0 [i915]
[  321.035343]  [<ffffffffa0401bf4>] i9xx_crtc_disable+0xf4/0x6f0 [i915]
[  321.035428]  [<ffffffffa03fbc61>] intel_crtc_control+0x51/0x120 [i915]
[  321.035519]  [<ffffffffa03fbd97>] intel_crtc_update_dpms+0x67/0x80 [i915]
[  321.035603]  [<ffffffffa0406791>] intel_connector_dpms+0x41/0x70 [i915]
[  321.035657]  [<ffffffffa02f4edc>]
drm_mode_obj_set_property_ioctl+0x35c/0x370 [drm]
[  321.035711]  [<ffffffffa02f4f1b>]
drm_mode_connector_property_set_ioctl+0x2b/0x30 [drm]
[  321.035754]  [<ffffffffa02e5a56>] drm_ioctl+0x1f6/0x680 [drm]
[  321.035808]  [<ffffffffa02f4ef0>] ?
drm_mode_obj_set_property_ioctl+0x370/0x370 [drm]
[  321.035835]  [<ffffffff81021ad9>] ? init_fpu+0x59/0xc0
[  321.035851]  [<ffffffff811cfe4e>] do_vfs_ioctl+0x7e/0x520
[  321.035865]  [<ffffffff811da044>] ? __fget+0x74/0xb0
[  321.035880]  [<ffffffff811d0381>] SyS_ioctl+0x91/0xb0
[  321.035895]  [<ffffffff8159ddac>] ? int_check_syscall_exit_work+0x34/0x3d
[  321.035910]  [<ffffffff8159db29>] system_call_fastpath+0x12/0x17

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