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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CHV] Backlight init fails on Surface 3 if module load order is wrong"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96571#c28">Comment # 28</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [CHV] Backlight init fails on Surface 3 if module load order is wrong"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96571">bug 96571</a>
from <span class="vcard"><a class="email" href="mailto:viric@viric.name" title="viric@viric.name">viric@viric.name</a>
</span></b>
<pre>I blacklisted the 'i915' module on boot, and the screen does not go black
anymore. Then, from the root shell I type "modprobe i915" and it goes black.
The kernel log says, since the modprobe:
[ 72.226417] Linux agpgart interface v0.103
[ 72.265453] [drm] Initialized drm 1.1.0 20060810
[ 72.384656] [drm] Memory usable by graphics device = 2048M
[ 72.384666] checking generic (80000000 1d5000) vs hw (80000000 10000000)
[ 72.384669] fb: switching to inteldrmfb from EFI VGA
[ 72.384773] Console: switching to colour dummy device 80x25
[ 72.384904] [drm] Replacing VGA console driver
[ 72.385680] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 72.385686] [drm] Driver supports precise vblank timestamp query.
[ 72.407090] vgaarb: device changed decodes:
PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[ 72.465860] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
[ 72.466436] input: Video Bus as
/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input6
[ 72.466663] [drm] Initialized i915 1.6.0 20160229 for 0000:00:02.0 on minor
0
[ 72.508911] audit: type=1130 audit(1468319461.361:75): pid=1 uid=0
auid=4294967295 ses=4294967295
msg='unit=systemd-backlight@backlight:intel_backlight comm="systemd"
exe="/nix/store/24qss832pv2xwpjbzk354kimypf4f1jc-systemd-230/lib/systemd/systemd"
hostname=? addr=? terminal=? res=success'
[ 72.695713] fbcon: inteldrmfb (fb0) is primary device
[ 74.649688] Console: switching to colour frame buffer device 100x80
[ 74.660835] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device</pre>
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