Random black screen flickering on Generic - Legacy

snooziepup · May 25, 2024 at 4:09 PM

When using Generic-Legacy on an Intel laptop, everything works fine aside from a half-second black screen that occurs seemingly at random, whether hardware acceleration is on or off. I haven't been able to fix the issue and I don't know what triggers the black screen.

**Da Flex** · May 25, 2024 at 4:43 PM

Please provide a full debug log.

How to post a log (wiki)

1. Enable debugging in Settings>System Settings>Logging
2. Restart Kodi
3. Replicate the problem
4. Generate a log URL (do not post/upload logs to the forum)

use "Settings > LibreELEC > System > Paste system logs" or run "pastekodi" over SSH, then post the URL link

snooziepup · May 25, 2024 at 5:43 PM

It happened twice in quick succession before the log was pasted. https://paste.libreelec.tv/viable-sculpin.log

snooziepup · May 25, 2024 at 6:56 PM

After more testing, this same problem also occurs with the non-legacy generic version on my hardware

**Da Flex** · May 25, 2024 at 7:14 PM

Seems like LE is still trying to use the laptop display (eDP1):

Code

2024-05-25 17:41:16.176 T:18747 warning <general>: CXRandR::Query - output eDP1 has no current mode, assuming disconnected
...
2024-05-25 17:41:30.582 T:18747 warning <general>: CXRandR::Query - output eDP1 has no current mode, assuming disconnected
...
2024-05-25 17:41:34.177 T:18747 warning <general>: CXRandR::Query - output eDP1 has no current mode, assuming disconnected

Add this to the boot options:

Code

video=eDP-1:d

snooziepup · May 25, 2024 at 8:17 PM

Even after adding this, the issue still occurs.

**Da Flex** · May 25, 2024 at 8:21 PM

Thanks. Is all your firmware up-to-date (especially HDMI)? You probably need Windows for this.

snooziepup · May 25, 2024 at 10:58 PM

I downloaded Windows and updated my BIOS to latest and then reinstalled LibreELEC but still no effect on the issue.

**Da Flex** · May 26, 2024 at 3:55 AM

Thanks. Please upload a crash report to PasteBin, and post the link.

Code

May 25 17:40:57.146052 LibreELEC kernel: waiting[18636]: segfault at 10 ip 00007f6dc98222ab sp 00007f6d95796730 error 4 in libpython3.11.so.1.0[7f6dc960e000+3c9000] likely on CPU 1 (core 0, socket 0)
May 25 17:40:57.146156 LibreELEC kernel: Code: 8b 47 10 48 89 fa 48 8b 78 28 48 8d 70 60 48 81 c7 60 01 00 00 e9 a5 fc ff ff 0f 1f 44 00 00 55 31 f6 53 48 89 fb 48 83 ec 08 <48> 8b 47 10 48 8b 68 28 48 8d bd 38 02 00 00 e8 41 13 ee ff 48 39
May 25 17:41:03.137349 LibreELEC kodi.sh[1075]: Segmentation fault (core dumped)
May 25 17:41:05.498753 LibreELEC kodi.sh[1075]: Crash report available at /storage/.kodi/temp/kodi_crashlog_20240525174103.log

snooziepup · May 26, 2024 at 12:37 PM

There may be a misunderstanding, the issue doesn't cause a crash

there was a crash as I was logging but it was unrelated, its because I tried to back out of a bunch of menus way too quickly

After more testing, this seems to either be my laptop's HDMI port, the TV's ports, or the cables ive used, as Windows also has this problem.

**Da Flex** · May 26, 2024 at 10:33 PM

Quote from snooziepup

After more testing, this seems to either be my laptop's HDMI port, the TV's ports, or the cables ive used, as Windows also has this problem.

Makes sense, because I don't see any serious issues in the log.

try another HDMI cable (if you buy a new one, get a 4K cable (a.k.a. HDMI 2.0 or 2.1))
use the first HDMI port on your TV

Random black screen flickering on Generic - Legacy

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