<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body>
<p>
<div>
<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#c33">Comment # 33</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 Hans de Goede from <a href="show_bug.cgi?id=108225#c29">comment #29</a>)
<span class="quote">> About the short flicker, I've been tracking down a regression in 4.20 (and
> thus also drm-next) which causes the screen to briefly go purple with DSI
> panels.
>
> Can you try:
>
> git revert 516a49cc19467e298d08a404f73a6e311f4548d1
>
> That fixes the purple flash for me (I need to write a proper commit message
> and then submit this revert upstream for 4.20).</span >
(In reply to Maarten Lankhorst from <a href="show_bug.cgi?id=108225#c31">comment #31</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=142522" name="attach_142522" title="More debug spam">attachment 142522</a> <a href="attachment.cgi?id=142522&action=edit" title="More debug spam">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=108225&attachment=142522'>[review]</a> [review]
> More debug spam
>
> Can you take a look at this patch?</span >
Thanks for the suggestions and the patch! I have applied git revert
516a49cc19467e298d08a404f73a6e311f4548d1, aswell as the patch from <a href="show_bug.cgi?id=108225#c31">comment #31</a>.
The flickering is gone. I have flicker-free, blanking-free boot experience.
Backlight never turns off during boot and backlight controls work after boot
procedure. Just perfect!
The debug message from patch #31 gave me this:
[ 2.426812] [drm] Backlight PCH value: 861, converted to freq 1134,
converted to lpt units 930, minmax: 249/4882
To sum it up: git revert 516a49cc19467e298d08a404f73a6e311f4548d1 and applying
patch #31 fixes this issue! Thank you! I haven't applied the 2nd git revert, as
this already worked as I wished.
Cheers,
Tolga</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>