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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] DPCD backlight causes black screen on ThinkPad X1 Carbon 4th Gen"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101619#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] 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:david.weinehall@intel.com" title="David Weinehall <david.weinehall@intel.com>"> <span class="fn">David Weinehall</span></a>
</span></b>
<pre>The new patch sadly doesn't work either. I added a debug statement to print
panel->backlight.max and intel_dp_aux_get_backlight(connector);
max is 0xFFFF, the backlight value is 0x200 (suspiciously low compared to the
max value).
Could this be a question of the register being detected as a 16-bit register
but really only being an 8-bit register?</pre>
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