[lug] screen frequently blacks out on recent update...

[Bear Giles]

It didn't seem to help...

... but possibly related, possibly not, on the Ubuntu desktop I tried to
run an X app remotely (with ssh -Y) and managed to lock up the system. When
it came back GDM did not - I just stare at an off-purple screen. It's still
on that screen even if I go walk my dog.

I did dpkg-reconfigure gdm3 with no luck.

Fortunately Kubuntu still works. It's still extremely frustrating.

On Tue, Jan 22, 2019 at 10:56 AM Bear Giles <bgiles at coyotesong.com> wrote:

> Thanks, I'll try that.
>
> These are both Dell 4k monitors and both have been working fine. The
> desktop can use both monitors but it can also be configured to use one
> while the laptop uses the HDMI port on the second monitor. I haven't had
> problems with this configuration in the past.
>
> On Tue, Jan 22, 2019 at 10:51 AM Davide Del Vento <
> davide.del.vento at gmail.com> wrote:
>
>> I have this happening occasionally to me. Changing the cables did not fix
>> it. Power supplies in the monitor seemed unlikely, since it randomly
>> affected either one of two monitors. Bad graphic card could be, however I
>> inadvertently found the following workaround which stops the problem for
>> the day and prevented me from worrying more about it (the machine will need
>> to be replaced in several months anyway, so not worth my time once I've
>> found this): go in pure-text mode (CTRL-ALT-F1), stay there for a few
>> seconds, go back to graphic mode (ALT-F7). Without this workaround, the
>> problem will continue so much to make the machine close to useless.
>>
>> Hope this helps.
>> Davide
>>
>>
>> On Tue, Jan 22, 2019 at 8:39 AM D. Stimits <stimits at comcast.net> wrote:
>>
>>> On January 22, 2019 at 5:15 AM Bear Giles <bgiles at coyotesong.com>
>>> wrote:
>>>
>>> Has anyone else seen their screen frequently blank out for 1-2 seconds
>>> after a recent update? This is happening on both an Ubuntu 18.10 and CentOS
>>> system. I don't think it's a hardware issue since it's two different
>>> systems, two different monitors, and both have worked fine until the last
>>> few days.
>>>
>>> I've had this occur when the power supply in the monitor was going bad.
>>> I've also had this occur when the cables needed reseating. I also replaced
>>> what I believe was a bad video card once for this (the problem went away
>>> for a while). I also did not believe it was the monitor because it affected
>>> both monitors, but if you have more than one, and hot plug detects one go
>>> out and back in, they *both* blink as it reconfigures. More often it
>>> has been the power supply going out (I've replaced power supplies within a
>>> couple of different monitors...apparently this is more common than it might
>>> appear). Perhaps the update was just coincidental.
>>>
>>>
>>> Both are running Gnome.
>>>
>>> (BTW I never managed to fix Gnome under 18.04. I eventually updated to
>>> 18.10 and it now works... but oddly I still get the Kubuntu logo when I'm
>>> prompted for the hardware decryption password.)
>>>
>>> Bear
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>>>
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>>
>> _______________________________________________
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>
>
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