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<body><span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Lockup after display enter powersaving mode"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94753">bug 94753</a>
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<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>NEEDINFO
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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Lockup after display enter powersaving mode"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94753#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Lockup after display enter powersaving mode"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94753">bug 94753</a>
from <span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
<pre>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.</pre>
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