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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [i915] can't set i1915.semaphores=1 on kernel 4.9 and above"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101381">101381</a>
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<th>Summary</th>
<td>[i915] can't set i1915.semaphores=1 on kernel 4.9 and above
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
</td>
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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>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>nunesgabrielbr@gmail.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=131880" name="attach_131880" title="Dmesg output">attachment 131880</a> <a href="attachment.cgi?id=131880&action=edit" title="Dmesg output">[details]</a></span>
Dmesg output
Hi.
Ever since I upgraded to kernels >4.9, I'm unable to set the i915.semaphores
option enabled (=1). Already tried Ubuntu, Debian, Arch and openSUSE and tried
setting the option both on /etc/default/grub and /etc/modprobe.d/i915.conf.
With kernels prior to 4.9, everything was working fine.
uname -rm:
4.11.4 x86_64
cat /proc/cmdline:
BOOT_IMAGE=/boot/vmlinuz-4.11.4 root=UUID=16e0a6c5-d60a-483e-a949-0b58aaf42417
ro rhgb quiet i915.semaphores=1
cat /sys/module/i915/parameters/semaphores:
0
Distro:
Fedora 25 Workstation
Video adapter:
Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev
07)
Dmesg attached.</pre>
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