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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [LPT SPT KBP] Acer V3-772G screen brightness cannot be adjusted with i915.fastboot enabled"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108225#c30">Comment # 30</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [LPT SPT KBP] Acer V3-772G screen brightness cannot be adjusted with i915.fastboot enabled"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108225">bug 108225</a>
from <span class="vcard"><a class="email" href="mailto:cevelnet@gmail.com" title="Tolga Cakir <cevelnet@gmail.com>"> <span class="fn">Tolga Cakir</span></a>
</span></b>
<pre>(In reply to Maarten Lankhorst from <a href="show_bug.cgi?id=108225#c24">comment #24</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=142465" name="attach_142465" title="Switch backlight to PWM mode on init.">attachment 142465</a> <a href="attachment.cgi?id=142465&action=edit" title="Switch backlight to PWM mode on init.">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=108225&attachment=142465'>[review]</a> [review]
> Switch backlight to PWM mode on init.
>
> This should definitely work, but might cause a flicker during boot. Can you
> check?</span >
I've just tested this, same setup as in <a href="show_bug.cgi?id=108225#c28">comment #28</a>. It worked the same as the
patch in <a href="show_bug.cgi?id=108225#c25">comment #25</a>. I've created a video after applying patch #24. Uploaded
on Google Drive.
fastboot=1 and patch #24:
<a href="https://drive.google.com/open?id=1UEvoKR_9vgJCuc5J4nMXRtiK0Tx8Uvo5">https://drive.google.com/open?id=1UEvoKR_9vgJCuc5J4nMXRtiK0Tx8Uvo5</a>
You can see the "blanking" behaviour I described in <a href="show_bug.cgi?id=108225#c28">comment #28</a> at around
00:00:15. I recorded the video in a dark room with high ISO, so you can see the
backlight behaviour more clearly. As you can see, the screen never turns off.
fastboot=0 and patch #24:
<a href="https://drive.google.com/open?id=1G4kqypsQ5fmWHpDAY1ezTPPrQTzkZMDN">https://drive.google.com/open?id=1G4kqypsQ5fmWHpDAY1ezTPPrQTzkZMDN</a>
The screen completely turns off and on, including backlight.
Patch #25 behaves the same as patch #24. If you have further ideas, how to fix
the blanking, I'm happy to try out more patches, as I have the testing
environment setup and working.
Thanks for the patches!
Cheers,
Tolga</pre>
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