[plug] blank screen issue

[gavinwc]

Thanks for your ideas, Locky. And again, the previous responders.

I haven't had a chance to do the fault-finding and logging that has been
suggested, but I am now suspectng that what it might reveal is thermal
"runaway" with the cpu. As said originally, this is a little intel nuc box
(on the back of the monitor), and into that I've crammed a 12th gen i7 with
64Gb ram and 2Tb ssd. As it so happens just before reading the latest
response the system went into unresponsive mode with blank screen again.
Only a hard reset gets it back again.

Immediately before this episode the tiny nuc box's fan was going flat out
because I'd spent a wasted few hours going down rabbit holes on youtube
videos, one after the other. The nuc external casing was almost too hot to
touch. Me thinks now that it was thermal shutdown and I will have to
investigate extra cooling for this box.

Occam's razor, do you think?

Thanks,
Gavin

On Tue, 12 Mar 2024 at 12:47, lhuck <lhuck at proton.me> wrote:

> My 'two cents' would be to check what GPU driver is being used, then try a
> different one and see if the problem repeats.
>
> Best of luck,
> Locky
>
> On Friday, March 1st, 2024 at 2:11 PM, Onno Benschop <onno at itmaze.com.au>
> wrote:
>
> Couple of things come to mind, none of them a smoking gun:
>
>    - If the computer is connected via HDMI and the cable is bad, all
>    manner of fun things can happen.
>    - Is power saving turned on somewhere and is it activating when the
>    user does nothing?
>    - Is the device being overloaded and is the machine freezing to
>    protect itself from magic smoke escaping.
>    - If the machine is unresponsive, is it unreachable through the
>    network - ie. can you ssh into it?
>    - dmesg -T will give you a human readable time stamped kernel log if
>    you can get it. You might want to log it to disk using cron every minute
>    while you're trying to discover what's wrong.
>    - You can also log CPU/GPU temperatures to a file and see what happens.
>    - Is the user changing video mode, or is a screensaver doing this for
>    them?
>
>
> On Fri, 1 Mar 2024 at 12:09, gavinwc <gavin.chester at gmail.com> wrote:
>
>> Hi folks,
>>
>> Not sitting at the offending PC at the moment, so can't give any
>> specifics on SW versions, etc at this time, sorry.
>>
>> Running up-to-date Mint on some heavy i7 NUC HW with a Dell 27" monitor.
>> Every now and then, usually when trying to launch some full-screen video,
>> the monitor blanks to just the backlight glow, the NUC fan speeds up and
>> the keyboard is unresponsive. Because of the last factor, no amount of
>> cntrl+BS, ctrl+alt+del, or trying to open a VT works. I have to do a hard
>> reset. Any ideas of any other HW / keyboard options I can try, or even
>> better, if there is a setting I need to look at to prevent this happening?
>>
>> Thanks.
>>
>> Gavin
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>
>
>
> --
> Onno Benschop
>
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>
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>
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>
> _______________________________________________
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