LM 18.3 freeze with tiny squares for chars in err msg dialog box

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neohkl
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Level 1
Posts: 13
Joined: Mon Jul 06, 2015 7:44 am

LM 18.3 freeze with tiny squares for chars in err msg dialog box

Post by neohkl »

Hi there All:

Appreciate if any user can tell me solution.

System:
OS: linux Mint 18.3
Kernel: 4.15.0-106-generic #107~16.04.1-Ubuntu SMP Thu Jun 4 15:40:05 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Memory: RAM 16G


Description:
Plse see captured attached screenShot.
Occurrence: Spontaneous, anytime after successful login and use.
TaskBAr disappears.
Can continue to use any opened browser.
Cant open Terminal to ShutDown.
Switching to other sessions by Ctrl-Alt-FnX ie Ctrl-Alt-Function Key (0 - 6) shows a stream of chars. No login prompt
At the Desktop Since no TAskbar, can't select SHUTDOWN.

Hard Shutdown required(Hit the Off Button.)

I have managed to stop this a few kernels back, after I free-ed disk space(even though I have about 90GB free) by deleting some files in ~/.cache/thumbnails. But lately the problem has come back, and the clearing of ~/.cache does not seem to resolve it anymore.

I had thought it is a HW over-heating problem, since it happens after some time of usage, but I have since booted the system with a live-USB and ran it way past the duration at which typically happens.

Any help is appreciated.
Rgds

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