<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body>
<p>
<div>
<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [i915][HSW][PM] Unable to use GFX RC6 on Dell Precision M6800"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98979#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [i915][HSW][PM] Unable to use GFX RC6 on Dell Precision M6800"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98979">bug 98979</a>
from <span class="vcard"><a class="email" href="mailto:shawn.starr@rogers.com" title="Shawn Starr <shawn.starr@rogers.com>"> <span class="fn">Shawn Starr</span></a>
</span></b>
<pre>Correct, turbostat -d would not show 'GFX%rc6 GFXMHz' fields
and Powertop would not show:
| GPU |
| |
| Powered On 0.0% |
| RC6 100.0% |
| RC6p 0.0% |
| RC6pp 0.0% |
Disabling GVT might be cause, unsure, I will rebuild with this module enabled -
even though Haswell has no GVT support (unimplemented).
As for i915.enable_fbc=1, shouldn't this be all detected by the driver? It
should have turned it on if I am able to get PC7, I have seen PC7 before, but
there is inconsistent power usage.
Right now I do not have FBC turned on explicitly and the laptop is at PC6, but
upon waking up it will return to PC2 99% of time, it is unable to go lower when
disabling Hybrid/Switchable graphics, I can get to PC6 even at idle w/o display
being shut off.
So some inconsistencies in that just turning on the HSW iGPU kills power
performance when idle but not display disabled. I'm curious as to why...</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
<li>You are the assignee for the bug.</li>
<li>You are the QA Contact for the bug.</li>
</ul>
</body>
</html>