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Re: Blank screen bug

On 10/08/2017 03:00 AM, Tim wrote:
First of all, sorry for my late reply: It took me a while before I
realized this is a mailing list. (I also hope Evolution is smart enough
to figure out to send the right In-Reply-To header.)

On Sat, 23 Sep 2017 20:28:59 -0500, David Wright wrote:
Does the screen turn blank after a random time, or at the time of
an event (like starting X, or starting an application, or some
heavy processing etc). After a minute or half an hour?

I want to clarify it happens at random times, not at a certain interval
after boot or during any event. I now also realize that I have been
unclear that it's actually happening temporarily: after a random number
of seconds, the screen shows the display again. I haven't found any
pattern causing the screen to show nothing, nor any pattern making the
desktop (and the running applications) show again. Sometimes this on-
off switch happens multiple times during the day. Usually the screen
goes only blank for a couple of seconds (1‒5 seconds), but I also once
had that I had to wait for about 45 seconds before it came back up.

Debian is set to blank at 5 seconds of no activity and if you are using HDMI it will take a few seconds before you will see the desktop.

Is the screen really black or just very dark?

Like the screen outputs pure black. I can still adjust the brightness
and this shows a ‘brighter’ or ‘less brighter’ black. It seems no bug
in the brightness settings as in the dual monitor setup I see that the
brightness remained the same after the laptop's screen goes dark.

What happens if you select a VC, or exit X? … … …

Good suggestion to try the virtual console! I've only been able to try
this once: The screen went blank, I switched to tty3 and the screen
showed the tty, I returned to tty2 (running GDM) and everything was
showing there as well. So either the screen was blank for just a second
or so, or switching to a different tty makes the screen come back

I will keep you posted once I've been able to try this more often.

Thanks for everybody's help so far!

Can you see the position of the screens? Maybe install package "aranr", it's a small GUI to setup the screens.

Hope that helps.
Jimmy Johnson

Ubuntu 16.04 LTS - KDE Plasma 5.8.7 - AMD A8-7600 - EXT4 at sda5
Registered Linux User #380263

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