5

I have a dell xps 15 9550, from a couple of weeks when I hibernate or suspend pc,and after when I try to switch on it doesn't wake up.I have to shutdown it using power button.

Kernel version 4.4.0-36 Thanks.

  • have you tried using systemctl suspend ? – Zanna Sep 8 '16 at 9:06
  • yes, but when I try to turn it on the screen remains black – apollo9 Sep 9 '16 at 7:37
  • Same problem here. Probably BIOS or display driver. – Jack Sep 28 '16 at 20:40
5

At time or writing, the workaround was to downgrade your BIOS to 1.2.0

An alternative is to log in (although you don't see your login screen), and then pump up your brightness to max.

For your configuration, keep an eye on this wiki.

UPDATE (Alternative Solution for 16.04):

This also solved the problem for me on a newer version of the BIOS:

Create a script:

sudo nano /lib/systemd/system-sleep/97fixbacklight

Contents:

#!/bin/sh
# From patchwork.freedesktop.org/.../
# and en.community.dell.com/.../19985320
# Suspend Resume fails to restore PWM_GRANUALITY
# Based on script by Tony.Jewell@Cregganna.Com


INTEL_REG=/usr/bin/intel_reg
ADDR="0x000c2000"
SAVE_FILE=/var/lib/systemd/save_intel_reg_pwm_granuality


[ -x "$INTEL_REG" ] || exit 0


case "$1" in
        pre)
        echo "$0: Saving Intel Register PWM_GRANUALITY"
        "$INTEL_REG" read "$ADDR" \
            | (read addr value && echo "$value") \
            >"$SAVE_FILE"
    sync
    ;;
    post)
        value=`cat "$SAVE_FILE" 2>/dev/null`
        if [ -n "$value" ]
        then
            echo "$0: Restoring Intel Register PWM_GRANUALITY $value"
            "$INTEL_REG" write "$ADDR" "$value"
            rm "$SAVE_FILE"
        fi
    ;;
esac

Give it the right permissions:

sudo chmod +755 /lib/systemd/system-sleep/97fixbacklight

Restart

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