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Re: Screen goes blank for 1-2 seconds

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On 2022-01-27 5:30 a.m., hdv@gmail wrote:
> 
> Sadly I do not have access to this machine remotely. I do have my own 
> VPN server, but that does not help when the machine in question is 
> turned off. ;-)
> 
> I'll check the temperature when I am back, and when it happens again.

I played around a tiny bit.

My GPU temperature when logged in remotely via VNC was 29C.

Logging in on local system GPU went up to high 30s just on the desktop.

I ran a game and initially the temperature went.

pwm1 (the power management state) was 0 (off) until 53C when it got set 
to 43.

Temperature went up to 62C, and then dropped to 45C, and then pwm1 went 
back to 0.

Temp went back to 53C before the power management kicked in again.

I did:
echo 0 > pwm1_enable

Which apparently maxes the power management as:
pwm1 was now 255

Then I did:
echo 1 > pwm1_enable

This seemed more aggressive than the default setting of 2 on my system.

Looking at the kernel docs:
https://www.kernel.org/doc/Documentation/hwmon/g762

It seems 1 setting is open mode and 2 is closed mode.

In closed mode it seems there is some feedback mechanism involving the 
fan speed.

Undocumented but it seems setting pwm1_enable to 0, just maxes the power 
management out.

Turns out it is documented in the kernel source comments:
  *  0 : no fan speed control (i.e. fan at full speed)
  *  1 : manual fan speed control enabled (use pwm[1-*]) (open-loop)
  *  2+: automatic fan speed control enabled (use fan[1-*]_target) 
(closed-loop)

Anyways with all this playing around I got my temp down to 21C, when 
logged in locally but not running the game.

tl;dr

If anyone has this happen quickly enough you could try setting fan speed 
to max (echo 0 > pwm1_enable and check that pwm1 goes to 255) and see if 
it fixes it.

Bijan

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Thread

Screen goes blank for 1-2 seconds Pankaj Jangid <pankaj@codeisgreat.org> - 2022-01-27 05:40 +0100
  Re: Screen goes blank for 1-2 seconds David Wright <deblis@lionunicorn.co.uk> - 2022-01-27 06:00 +0100
    Re: Screen goes blank for 1-2 seconds Pankaj Jangid <pankaj@codeisgreat.org> - 2022-01-27 15:10 +0100
  Re: Screen goes blank for 1-2 seconds Bijan Soleymani <bijan@psq.com> - 2022-01-27 06:10 +0100
    Re: Screen goes blank for 1-2 seconds Pankaj Jangid <pankaj@codeisgreat.org> - 2022-01-27 15:20 +0100
  Re: Screen goes blank for 1-2 seconds "hdv@gmail" <hdv.jadev@gmail.com> - 2022-01-27 10:10 +0100
    Re: Screen goes blank for 1-2 seconds Bijan Soleymani <bijan@psq.com> - 2022-01-27 10:30 +0100
      Re: Screen goes blank for 1-2 seconds Bijan Soleymani <bijan@psq.com> - 2022-01-27 10:50 +0100
        Re: Screen goes blank for 1-2 seconds "hdv@gmail" <hdv.jadev@gmail.com> - 2022-01-27 11:10 +0100
          Re: Screen goes blank for 1-2 seconds Bijan Soleymani <bijan@psq.com> - 2022-01-27 11:20 +0100
            Re: Screen goes blank for 1-2 seconds "hdv@gmail" <hdv.jadev@gmail.com> - 2022-01-27 11:40 +0100
              Re: Screen goes blank for 1-2 seconds Bijan Soleymani <bijan@psq.com> - 2022-01-27 16:50 +0100
              Re: Screen goes blank for 1-2 seconds "hdv@gmail" <hdv.jadev@gmail.com> - 2022-02-09 21:00 +0100
    Re: Screen goes blank for 1-2 seconds Pankaj Jangid <pankaj@codeisgreat.org> - 2022-01-27 15:30 +0100
  Re: Screen goes blank for 1-2 seconds Vincent Lefevre <vincent@vinc17.net> - 2022-01-27 11:50 +0100
    Re: Screen goes blank for 1-2 seconds Vincent Lefevre <vincent@vinc17.net> - 2022-01-27 11:50 +0100
      Re: Screen goes blank for 1-2 seconds Tim Woodall <debianuser@woodall.me.uk> - 2022-01-27 12:20 +0100
        Re: Screen goes blank for 1-2 seconds Pankaj Jangid <pankaj@codeisgreat.org> - 2022-01-27 15:40 +0100
    Re: Screen goes blank for 1-2 seconds Pankaj Jangid <pankaj@codeisgreat.org> - 2022-01-27 15:40 +0100
  Re: Screen goes blank for 1-2 seconds Dan Ritter <dsr@randomstring.org> - 2022-01-27 12:40 +0100
    Re: Screen goes blank for 1-2 seconds Pankaj Jangid <pankaj@codeisgreat.org> - 2022-01-27 15:30 +0100
      Re: Screen goes blank for 1-2 seconds Pankaj Jangid <pankaj@codeisgreat.org> - 2022-01-28 08:10 +0100
        Re: Screen goes blank for 1-2 seconds Pankaj Jangid <pankaj@codeisgreat.org> - 2022-01-28 14:40 +0100
          Re: Screen goes blank for 1-2 seconds "hdv@gmail" <hdv.jadev@gmail.com> - 2022-01-28 14:50 +0100
            Re: Screen goes blank for 1-2 seconds Bijan Soleymani <bijan@psq.com> - 2022-01-28 15:40 +0100
              Re: Screen goes blank for 1-2 seconds "hdv@gmail" <hdv.jadev@gmail.com> - 2022-01-28 16:20 +0100
                Re: Screen goes blank for 1-2 seconds Bijan Soleymani <bijan@psq.com> - 2022-01-28 16:50 +0100
                Re: Screen goes blank for 1-2 seconds "hdv@gmail" <hdv.jadev@gmail.com> - 2022-01-28 17:00 +0100
                Re: Screen goes blank for 1-2 seconds "Andrew M.A. Cater" <amacater@einval.com> - 2022-01-28 17:00 +0100
                Re: Screen goes blank for 1-2 seconds "hdv@gmail" <hdv.jadev@gmail.com> - 2022-01-28 17:10 +0100
                Re: Screen goes blank for 1-2 seconds "Andrew M.A. Cater" <amacater@einval.com> - 2022-01-28 21:40 +0100
  Re: Screen goes blank for 1-2 seconds Pankaj Jangid <pankaj@codeisgreat.org> - 2022-02-06 17:10 +0100
    Re: Screen goes blank for 1-2 seconds Pankaj Jangid <pankaj@codeisgreat.org> - 2022-02-09 14:10 +0100

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