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authorLeah Rowe <info@minifree.org>2016-11-17 19:20:51 +0000
committerLeah Rowe <info@minifree.org>2016-11-17 19:20:51 +0000
commitbfd0bbc84bc76dc492b27ad975a623e63bfd11bb (patch)
tree77251446ea59f1dfff713b0e2a51ea42edd7441d
parenta2e4e99aba8a48b054d7d7dc00bea185b77f3c6a (diff)
downloadlibrebootfr-bfd0bbc84bc76dc492b27ad975a623e63bfd11bb.tar.gz
librebootfr-bfd0bbc84bc76dc492b27ad975a623e63bfd11bb.zip
docs/misc: add note about e1000 driver issue
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@@ -27,6 +27,7 @@
<li><a href="#backlight control">Finetune backlight control on intel gpu’s</a></li>
<li><a href="#get_edid_panelname">Get EDID: Find out the name (model) of your LCD panel</a></li>
<li><a href="bbb_ehci.html">How to enable EHCI debugging on the BeagleBone Black</a></li>
+ <li><a href="#e1000-hang">e1000e driver trouble shooting (Intel NICs)</a></li>
</ul>
</div>
@@ -267,6 +268,42 @@ WantedBy=multi-user.target
<div class="section">
+ <h1 id="e1000-hang">e1000e driver trouble shooting (Intel NICs)</h1>
+ <p>
+ Example error, ¿may happen on weird and complex routing schemes(citation needed for cause):
+ </p>
+<pre>
+e1000e 0000:00:19.0 enp0s25: Detected Hardware Unit Hang
+</pre>
+ <p>
+ Possible workaround, tested by Nazara: Disable C-STATES.<br/>
+ <strong>
+ NOTE: this also disables power management, because disabling C-States
+ means that your CPU will now be running at full capacity (and therefore
+ using more power) non-stop, which will drain battery life if this is a laptop.
+ If power usage is a concern, then you should not use this.
+ (we're also not sure whether this workaround is appropriate)
+ </strong>
+ </p>
+ <p>
+ To disable c-states, do this in GNU+Linux:<br/>
+ <strong>
+ for i in /sys/devices/system/cpu/cpu/cpuidle/state/disable; do echo 1 &gt; $i; done
+ </strong>
+ </p>
+ <p>
+ You can reproduce this issue more easily by sending lots of traffic across
+ subnets on the same interface (NIC).
+ </p>
+ <p>
+ More information, including logs, can be found on
+ <a href="https://notabug.org/vimuser/libreboot/issues/23">this page</a>.
+ </p>
+
+ </div>
+
+ <div class="section">
+
<h1 id="usb_keyboard_gm45">USB keyboard wakeup on GM45 laptops</h1>
<p>
Look at resources/scripts/helpers/misc/libreboot_usb_bugfix