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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no backlight), no backlight control but can see screen in reflected light"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73156#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no backlight), no backlight control but can see screen in reflected light"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73156">bug 73156</a>
from <span class="vcard"><a class="email" href="mailto:daiver@daiver.ru" title="Daiver <daiver@daiver.ru>"> <span class="fn">Daiver</span></a>
</span></b>
<pre>Found magic combination to make all LCD work:
- add i915.panel_ignore_lid=-2 to kernel boot params, full off laptop
- first boot with lid closed (turn on, BIOS turn on DP1, grub on DP1, got X11
desktop on DP1)
- second boot with lid opened (open lid, see backlight on eDP1, but no X11
desktop on eDP1, reboot, BIOS not run off DP1, but grub on eDP1)
- get all LCD worked</pre>
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