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<body><span class="vcard"><a class="email" href="mailto:peter@lekensteyn.nl" title="Peter Wu <peter@lekensteyn.nl>"> <span class="fn">Peter Wu</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - Acer Aspire V7-582PG (Haswell, GTX 750M) fails to power off GPU with runtime PM"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98398">bug 98398</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Summary</td>
<td>[Nouveau] Vgaswitcharoo fails to turn off GPU properly
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<td>Acer Aspire V7-582PG (Haswell, GTX 750M) fails to power off GPU with runtime PM
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<td style="text-align:right;">CC</td>
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<td>peter@lekensteyn.nl
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Acer Aspire V7-582PG (Haswell, GTX 750M) fails to power off GPU with runtime PM"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98398#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Acer Aspire V7-582PG (Haswell, GTX 750M) fails to power off GPU with runtime PM"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98398">bug 98398</a>
from <span class="vcard"><a class="email" href="mailto:peter@lekensteyn.nl" title="Peter Wu <peter@lekensteyn.nl>"> <span class="fn">Peter Wu</span></a>
</span></b>
<pre>Pablo, the issues that bbswitch has is different from the one reported here.
bbswitch is not updated for 4.8 requiring the pcie_port_pm=off workaround.
There are more details for this bug from the reporter in IRC (search for
NanoSector):
<a href="https://people.freedesktop.org/~cbrill/dri-log/index.php?channel=nouveau&date=2016-10-22">https://people.freedesktop.org/~cbrill/dri-log/index.php?channel=nouveau&date=2016-10-22</a>
In particular, Rick reported that the issue apparently also appears with older
kernels, including 4.3 to 4.8. This is significant and a surprising result
because kernel 4.8 plus pcie_port_pm=off (or the d3cold_allowed change) should
have the same result as 4.7 or before. Rick, can you re-test it with 4.7?
It also occurs to me that older kernels might not support your GPU, so be sure
to keep a dmesg around.</pre>
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