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commit bfd0bbc84bc76dc492b27ad975a623e63bfd11bb
parent a2e4e99aba8a48b054d7d7dc00bea185b77f3c6a
Author: Leah Rowe <>
Date:   Thu, 17 Nov 2016 19:20:51 +0000

docs/misc: add note about e1000 driver issue

docs/misc/index.html | 37+++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+), 0 deletions(-)

diff --git a/docs/misc/index.html b/docs/misc/index.html @@ -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 @@ <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="">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