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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - After resuming from suspend, discrete GPU is powered on and can't be turned off"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108058">108058</a>
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<th>Summary</th>
<td>After resuming from suspend, discrete GPU is powered on and can't be turned off
</td>
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<th>Product</th>
<td>xorg
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Driver/nouveau
</td>
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<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>domenico.iezzi.201@gmail.com
</td>
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<th>QA Contact</th>
<td>xorg-team@lists.x.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=141734" name="attach_141734" title="kernel log">attachment 141734</a> <a href="attachment.cgi?id=141734&action=edit" title="kernel log">[details]</a></span>
kernel log
Overall, nouveau works without problem in managing discrete GPU PM, and if I
check power consumption using powertop on a fresh boot it reports an average
battery discharge rate of ~7W like always.
After I resume the laptop from suspend, /sys/kernel/debug/vgaswitcheroo/switch
reports that the device is
dynamically turned off:
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:01:00.0
But if I check with powertop, I get a battery discharge rate of ~11W. To better
identify the problem, I tried using bumbleebee+bbswitch+nvidia-driver and see
what bbswitch module reports. On a fresh boot, it works
ok as the nouveau driver, but after resuming from suspend
/proc/acpi/bbswitch reports that the card is turned ON, and there is no way to
power it off:
[root@example user]# cat /proc/acpi/bbswitch
0000:04:00.0 ON
[root@example user]# tee /proc/acpi/bbswitch <<<OFF
OFF
[root@example user]# cat /proc/acpi/bbswitch
0000:04:00.0 ON
I attached the kernel log using following parameters when using only nouveau
driver (no bumblebee/bbswitch/nvidia): log_buf_len=1M nouveau.debug=debug.
System specs:
Asus Vivobook S551LN
Intel i7 4500U
NVIDIA 840M
Archlinux 4.18.9-arch1-1-ARCH (but affecting older versions, since early 4.x
version when i started using linux)</pre>
</div>
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