Laptop goes to sleep when DMPS goes to “offâ€
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Context
For eons, I have used this command on many machines, to switch display off while letting the machine do some work:
xset dpms force off
On a laptop running Xubuntu 16.04, this has been working for years, shutting display off (including backlight). Pressing any key (I use Ctrl or Shift) switched display on again.
Problem
It seems that for the last few months, running that command still works, but after about 20-30 seconds, the whole machine goes to suspend. This is not intended: the machine is working on something.
Investigation
- Of course, power parameters are set to never go to sleep on inactivity.
- I can't pinpoint when the transition happened.
- User-level parameter change is unlikely but not impossible.
- System-level change might be the source. Recently updated
intel-microcodeand this seemed to correlate with another problem (details : sometimes after session lock, screen stays black, text consoles no longer work, machine looks powered on but hung, SysRq+S doesn't cause storage led blink, yet pressing power button finally seems to get the machine back to usable state). Not sure if any correlation, though.
Question
xset dpms force off only affects the display, should not cause any machine-level sleep (suspend-to-ram). Anyone has experienced similar situation?
16.04 xubuntu suspend display power-management
asked Apr 23 at 20:55
Stéphane Gourichon
1,3101427
add a comment |Â
up vote
0
down vote
favorite
Context
For eons, I have used this command on many machines, to switch display off while letting the machine do some work:
xset dpms force off
On a laptop running Xubuntu 16.04, this has been working for years, shutting display off (including backlight). Pressing any key (I use Ctrl or Shift) switched display on again.
Problem
It seems that for the last few months, running that command still works, but after about 20-30 seconds, the whole machine goes to suspend. This is not intended: the machine is working on something.
Investigation
- Of course, power parameters are set to never go to sleep on inactivity.
- I can't pinpoint when the transition happened.
- User-level parameter change is unlikely but not impossible.
- System-level change might be the source. Recently updated
intel-microcodeand this seemed to correlate with another problem (details : sometimes after session lock, screen stays black, text consoles no longer work, machine looks powered on but hung, SysRq+S doesn't cause storage led blink, yet pressing power button finally seems to get the machine back to usable state). Not sure if any correlation, though.
Question
xset dpms force off only affects the display, should not cause any machine-level sleep (suspend-to-ram). Anyone has experienced similar situation?
16.04 xubuntu suspend display power-management
asked Apr 23 at 20:55
Stéphane Gourichon
1,3101427
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
Context
For eons, I have used this command on many machines, to switch display off while letting the machine do some work:
xset dpms force off
On a laptop running Xubuntu 16.04, this has been working for years, shutting display off (including backlight). Pressing any key (I use Ctrl or Shift) switched display on again.
Problem
It seems that for the last few months, running that command still works, but after about 20-30 seconds, the whole machine goes to suspend. This is not intended: the machine is working on something.
Investigation
- Of course, power parameters are set to never go to sleep on inactivity.
- I can't pinpoint when the transition happened.
- User-level parameter change is unlikely but not impossible.
- System-level change might be the source. Recently updated
intel-microcodeand this seemed to correlate with another problem (details : sometimes after session lock, screen stays black, text consoles no longer work, machine looks powered on but hung, SysRq+S doesn't cause storage led blink, yet pressing power button finally seems to get the machine back to usable state). Not sure if any correlation, though.
Question
xset dpms force off only affects the display, should not cause any machine-level sleep (suspend-to-ram). Anyone has experienced similar situation?
16.04 xubuntu suspend display power-management
asked Apr 23 at 20:55
Stéphane Gourichon
1,3101427
Context
For eons, I have used this command on many machines, to switch display off while letting the machine do some work:
xset dpms force off
On a laptop running Xubuntu 16.04, this has been working for years, shutting display off (including backlight). Pressing any key (I use Ctrl or Shift) switched display on again.
Problem
It seems that for the last few months, running that command still works, but after about 20-30 seconds, the whole machine goes to suspend. This is not intended: the machine is working on something.
Investigation
- Of course, power parameters are set to never go to sleep on inactivity.
- I can't pinpoint when the transition happened.
- User-level parameter change is unlikely but not impossible.
- System-level change might be the source. Recently updated
intel-microcodeand this seemed to correlate with another problem (details : sometimes after session lock, screen stays black, text consoles no longer work, machine looks powered on but hung, SysRq+S doesn't cause storage led blink, yet pressing power button finally seems to get the machine back to usable state). Not sure if any correlation, though.
Question
xset dpms force off only affects the display, should not cause any machine-level sleep (suspend-to-ram). Anyone has experienced similar situation?
16.04 xubuntu suspend display power-management
asked Apr 23 at 20:55
Stéphane Gourichon
1,3101427
asked Apr 23 at 20:55
Stéphane Gourichon
1,3101427
asked Apr 23 at 20:55
Stéphane Gourichon
1,3101427
asked Apr 23 at 20:55
Stéphane Gourichon
1,3101427
1,3101427
add a comment |Â
add a comment |Â
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