This version is no longer supported. If this is still reproducible on a
newer/supported version, please reopen.
** Changed in: linux (Ubuntu)
Status: Incomplete => Won't Fix
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https://bugs.launchpad.net/bugs/955046
Title:
Screen backlight is OFF when resuming from suspend with vgaswitcheroo
controlled cards
Status in Linux:
Confirmed
Status in linux package in Ubuntu:
Won't Fix
Bug description:
Using vgaswitcheroo to disable the integrate or discrete card could
lead to some troubles when resuming from suspension (to RAM or disk as
well). Basically, the computer monitor backlight could be not be
turned on again when resuming from suspension.
To me it happens this:
- I disable the integrated card
- Suspend
- Resume: no monitor backlight is on
At this point doing what mentioned below fix the issue, but it must be done
by SSH or by memory :):
echo DIGD > /sys/kernel/debug/vgaswitcheroo/switch
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
So, the easiest and clean fix should be to add a sleep.d script
something like:
#!/bin/sh
if [ -e /sys/kernel/debug/vgaswitcheroo/switch ]; then
case "$1" in
hibernate|suspend)
echo ON > /sys/kernel/debug/vgaswitcheroo/switch
;;
thaw|resume)
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
;;
esac
fi
This would fix the issue for vgaswitcheroo users and won't touch the
others.
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