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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - DPCD backlight causes black screen on ThinkPad X1 Carbon 4th Gen"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101619#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - DPCD backlight causes black screen on ThinkPad X1 Carbon 4th Gen"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101619">bug 101619</a>
from <span class="vcard"><a class="email" href="mailto:dhinakaran.pandiyan@intel.com" title="Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>"> <span class="fn">Dhinakaran Pandiyan</span></a>
</span></b>
<pre>(In reply to Puthikorn Voravootivat from <a href="show_bug.cgi?id=101619#c3">comment #3</a>)
<span class="quote">> From you i915_dpcd, address 0x702 is 0xf6
>
> That means
> BACKLIGHT_BRIGHTNESS_PWM_PIN_CAPABLE == 0
> BACKLIGHT_BRIGHTNESS_AUX_SET_CAPABLE == 1
>
> From that, look like using DPCD is the right thing.
> This means that the panel advertised wrong DPCD value.</span >
Yeah, except for this caps bit that the panel is advertizing incorrectly, I
can't see anything wrong in the DPCD values.
David,
Can you please try the debug patch that forces the minimum brightness to a
higher value?</pre>
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