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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [GLK DSI] Black screen after grub - Ubuntu 18.04 - kernel latest tip 21.11.2018"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108826#c154">Comment # 154</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [GLK DSI] Black screen after grub - Ubuntu 18.04 - kernel latest tip 21.11.2018"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108826">bug 108826</a>
from <span class="vcard"><a class="email" href="mailto:markwynngarcia@outlook.com" title="Mark Wynn Garcia <markwynngarcia@outlook.com>"> <span class="fn">Mark Wynn Garcia</span></a>
</span></b>
<pre>I looked further into the docs regarding multiplexing, specifically...
Table 3-52.Northwest Community Mapping (TXE and Direct IRQ), important to see
the note below the table:
<a href="https://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/silver-celeron-datasheet-vol-1.pdf">https://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/silver-celeron-datasheet-vol-1.pdf</a>
9.365 Event Trigger Output Enable (EVOUTEN_0)—Offset 210h
29.367 Event Trigger Mapping (EVMAP_0)—Offset 220h
<a href="https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/silver-celeron-datasheet-vol-2.pdf">https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/silver-celeron-datasheet-vol-2.pdf</a>
And found a similar-sounding EFI implementation for broxton in
<a href="https://github.com/tianocore-training/PlatformBuildLab_UP2_FW/blob/7600efc681e74d08682ef32ce8c3f0230721233b/FW/PlatformBuildLab/MV3/edk2-platforms/Silicon/BroxtonSoC/BroxtonSiPkg/Library/GpioLib/GpioLib.c#L308">https://github.com/tianocore-training/PlatformBuildLab_UP2_FW/blob/7600efc681e74d08682ef32ce8c3f0230721233b/FW/PlatformBuildLab/MV3/edk2-platforms/Silicon/BroxtonSoC/BroxtonSiPkg/Library/GpioLib/GpioLib.c#L308</a>
It could be that i915 is wreaking havoc on the registers involved which are
already properly set by EFI.</pre>
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