No video after resume from suspend

russell.poffenberger at xcerra.com russell.poffenberger at xcerra.com
Thu Apr 14 16:29:29 UTC 2016


Thanks for the info Thomas.

ctrl+alt+f2 does not appear to do anything. I see no visible effects when 
the display is running normally (before suspend) nor does it wake the 
screen after resuming from suspend.
Failsafe mode also fails to restore the display when resuming.
One odd note I found is that I have some difficulty with hibernate also. 
If I attempt to hibernate this system, it takes about 2 minutes for it to 
actually go into hibernation. I have tried many things to see what is 
going on including booting with parameters such as ignore_loglevel, 
initcall_debug, no_console_suspend, etc. but there are no messages 
indicating why it takes so long to hibernate.
The funny thing is that if I suspend/resume, then rlogin to the machine 
and invoke hibernate, it goes into hibernation in about 10 seconds. 
Booting and restoring from hibernation restores everything (including the 
screen) right where it ought to be.

My workaround for now is to make a script with the following commands
rtcwake -m mem -s 5;systemctl hibernate
Although it takes longer to recover than suspend/resume, it is within 
acceptable parameters.

-----------------------------------------------------
Russ Poffenberger | System Architecture Group
Phone:  +1 / 408 / 635-6049
russell.poffenberger at xcerra.com
Xcerra Corporation, LTX/Credence Division
1355 California Circle
Milpitas, CA 95035, USA
-----------------------------------------------------



From:
Thomas L├╝bking <thomas.luebking at gmx.de>
To:
russell.poffenberger at xcerra.com
Date:
04/14/2016 03:47 AM
Subject:
Re: No video after resume from suspend



On Wed, Apr 13, 2016 at 05:44:27PM -0700, russell.poffenberger at xcerra.com 
wrote:
>When I put the system to sleep, after resuming from sleep, the system
>comes alive (I can rlogin fine), but there is no video signal, as 
reported
>by the monitor and a blank display. No amount of pressing keys or moving
>the mouse have any effect.

Can you switch to another VT (ctrl+alt+f2) and does the framebuffer
change get you a signal?

>Is there something I can send or do to wake the video up, at least to try
>and understand what is not resuming properly?

No idea whether that's related, but at least the nvidia blob has/d trouble
moving data between VRAM and RAM across STR.

Are you running gnome and does it also happen with a failsafe login?
(Anything that's not a GL composited DE)

Cheers,
Thomas


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