[Bug 94753] Lockup after display enter powersaving mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94753

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #1 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
This is one problem:
[    3.987505] [drm:pwm_setup_backlight [i915]] *ERROR* Failed to own the pwm
chip
and can explain the backlight staying on.

The best workaround for that right now is to make i915 a module, and build the
required i2c/gpio/pwm support into the kernel itself:
CONFIG_I2C_DESIGNWARE_PLATFORM=y
CONFIG_I2C_DESIGNWARE_PCI=y
CONFIG_INTEL_SOC_PMIC=y
CONFIG_GPIO_CRYSTAL_COVE=y
CONFIG_PWM_CRC=y
CONFIG_DRM_I915=m

For some further debug information please boot with drm.debug=0xe kernel
command line option and attach the dmesg here. Also please attach a copy of
/sys/kernel/debug/dri/0/i915_opregion

As far as the lockup goes, Jani had a very similar problem on a CHT tablet
recently, but I think that turned out to due to wifi. Your log is also full of
some audio noise as well, so I'd also try to eliminate as many non-display
related drivers as possible.

To rule out GPU runtime PM do this:
'echo on > /sys/class/drm/card0/device/power/control'
before turning off the display.

To rule out display power well problems boot with i915.disable_power_well=0
kernel command line option.

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