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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - i915.fastboot=1 is broken on Thinkpad S1 Yoga (Haswell)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108773#c12">Comment # 12</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - i915.fastboot=1 is broken on Thinkpad S1 Yoga (Haswell)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108773">bug 108773</a>
from <span class="vcard"><a class="email" href="mailto:johannes.krampf@gmail.com" title="Johannes Krampf <johannes.krampf@gmail.com>"> <span class="fn">Johannes Krampf</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=144307" name="attach_144307" title="dmesg linux-next 20190517 with fastboot on T440s">attachment 144307</a> <a href="attachment.cgi?id=144307&action=edit" title="dmesg linux-next 20190517 with fastboot on T440s">[details]</a></span>
dmesg linux-next 20190517 with fastboot on T440s
I tried linux-next. When I cloned the tree, the latest version was
b1d6682ef9bb6893690e39e2186371a1dc45072b with the tag next-20190517.
The kernel worked fine without fastboot.
With fastboot I would very briefly (<second) see boot messages, then the screen
would go black, but with the backlight on. Finally, around the time I expect
Wayland to have started, the screen went completely black with the backlight
being off.
The machine was running and I was able to open a terminal and redirect dmesg to
a file. I was also able to switch to a virtual terminal, redirect dmesg once
more to a file and to trigger a reboot. All of this was with the backlight
being off.
I did not try the equivalent of `xset dpms force off` because I couldn't
remember how this worked on Wayland/sway. I can try this if it would be
helpful. Please ask me in this case.</pre>
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