Hi,
you may fist determine if it is a hardware issue or a software issue.
Some Mac screens are known to flicker after a while.
What is your computer ? Can you boot on Windows/MacOS to see if the same thing 
happens ?
Knowing your hardware may help a lot.
hth,
Jerome

On 21/10/2021 10:51, lina wrote:
k10temp-pci-00c3
Adapter: PCI adapter
Tctl:         +62.6°C
Tdie:         +62.6°C
Tccd1:        +45.2°C
Tccd2:        +62.8°C
Tccd3:        +60.8°C
Tccd4:        +45.8°C
Tccd5:        +43.8°C
Tccd6:        +45.2°C
Tccd7:        +43.5°C
Tccd8:        +43.5°C

nvme-pci-4800
Adapter: PCI adapter
Composite:    +34.9°C  (low  =  -0.1°C, high = +89.8°C)
                        (crit = +94.8°C)

nouveau-pci-0100
Adapter: PCI adapter
GPU core:    912.00 mV (min =  +0.80 V, max =  +1.19 V)
temp1:        +34.0°C  (high = +95.0°C, hyst =  +3.0°C)
                        (crit = +105.0°C, hyst =  +5.0°C)
                        (emerg = +135.0°C, hyst =  +5.0°C)

On Wed, Oct 20, 2021 at 3:22 PM Andrew M.A. Cater <amaca...@einval.com 
<mailto:amaca...@einval.com>> wrote:

    On Wed, Oct 20, 2021 at 02:42:11PM +0200, lina wrote:
     > Hi all,
     >
     > After using the computer for a long while, my screen will blink.
     >
     > It has been months since the last time I upgraded the system.
     >
     > I don't know how to start checking, every time I have to reboot the
     > computer,
     >
     > would be great to get your advice,
     >
     > thanks,

    First things first: update your computer. Security fixes and fixes for
    other problems come out all the time.

    What Debian version are you running?

    On what sort of computer?

    Do you have screensavers or similar kicking in?

    is there a temperature issue?

    Are there logs?

    A little more information would be helpful.

    All the very best, as ever,

    Andy Cater


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