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fake-suspend: cut the panel backlight even when DPMS handles the blank

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The compositor path blanked the framebuffer but could leave the panel
backlight powered, so the "sleeping" console showed a black yet lit
screen and kept burning the display power budget. Turn the backlight
off through bl_power in both paths and restore it on wake.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Douglas Teles
2026-07-07 19:24:07 -03:00
parent a0a45889f4
commit 5f1f6182cf
1 changed files with 11 additions and 14 deletions
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projects/ArchR/packages/archr/sources/scripts/archr-fake-suspend
+11 -14
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@@ -66,14 +66,14 @@ display_off() {
elif echo "${UI_SERVICE}" | grep "weston"; then
weston-dpms -m off
fi
else
# DPMS disabled, just turn off the backlight
${DEBUG} && log $0 "Backlight off"
for BL_POWER_DEVICE in "${BL_POWER_DEVICES[@]}"; do
echo 4 > "${BL_POWER_DEVICE}"
done
fi
# Always cut the backlight too: the compositor path blanks the
# framebuffer but can leave the panel backlight powered (black yet
# lit screen), which wastes most of the display power budget.
${DEBUG} && log $0 "Backlight off"
for BL_POWER_DEVICE in "${BL_POWER_DEVICES[@]}"; do
echo 4 > "${BL_POWER_DEVICE}"
done
}
display_on() {
@@ -87,14 +87,11 @@ display_on() {
elif echo "${UI_SERVICE}" | grep "weston"; then
weston-dpms -m on
fi
else
# DPMS disabled, just turn on the backlight
${DEBUG} && log $0 "Backlight on"
for BL_POWER_DEVICE in "${BL_POWER_DEVICES[@]}"; do
echo 0 > "${BL_POWER_DEVICE}"
done
fi
${DEBUG} && log $0 "Backlight on"
for BL_POWER_DEVICE in "${BL_POWER_DEVICES[@]}"; do
echo 0 > "${BL_POWER_DEVICE}"
done
}
mute_audio() {