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<body><span class="vcard"><a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - Machine hang with i915.enable_psr=1 (Kaby Lake R)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112159">bug 112159</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">i915 features</td>
<td>
</td>
<td>display/PSR
</td>
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<td style="text-align:right;">CC</td>
<td>
</td>
<td>jose.souza@intel.com
</td>
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Machine hang with i915.enable_psr=1 (Kaby Lake R)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112159#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Machine hang with i915.enable_psr=1 (Kaby Lake R)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112159">bug 112159</a>
from <span class="vcard"><a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
</span></b>
<pre>(In reply to Raphael Kubo da Costa from <a href="show_bug.cgi?id=112159#c0">comment #0</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=145835" name="attach_145835" title="dmesg with drm.debug=0x1e log_buf_len=1M">attachment 145835</a> <a href="attachment.cgi?id=145835&action=edit" title="dmesg with drm.debug=0x1e log_buf_len=1M">[details]</a></span>
> dmesg with drm.debug=0x1e log_buf_len=1M
>
> I'm running Fedora with kernel 5.3.7, and have been experiencing this issue
> for several months. Essentially, if I boot my laptop _without_ plugging it
> to an external display (via an HDMI port, for example), then it is almost
> 100% certain that it is either going to hang while waiting for my LUKS
> password, during the boot process or if I later switch to a non-X11/Wayland
> VT. The entire machine hangs, and I need to manually power it off and then
> turn it on again. This machine is a Dell Latitude 7390 with an i7-8650U
> processor.
>
> I played with a few boot parameters today, and noticed that any of the
> following seem to stop the problem from happening:
> * intel_idle.max_cstate=1
> * i915.enable_dc=0
> * i915.enable_psr=0
> * i915.dmc_firmware_path=""
> * nomodeset i915.modeset=0
>
> I'm attaching dmesg from a kernel-debug run with drm.debug=0x1e and
> log_buf_len=1M that did not hang, but has two WARN_ONs there. I also have a
> few other saved dmesgs, but they were produced without booting with
> drm.debug=0x1e and log_buf_len=1M.</span >
CC'ing Jose.</pre>
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