Bug 130246 - Random lines appear on large text when hardware acceleration is enabled (Linux, not with VCL gen)
Summary: Random lines appear on large text when hardware acceleration is enabled (Linu...
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Impress (show other bugs)
(earliest affected) rc
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Not Assigned
Depends on:
Reported: 2020-01-28 21:05 UTC by Kuba Orlik
Modified: 2022-06-23 03:48 UTC (History)
2 users (show)

See Also:
Crash report or crash signature:
Regression By:


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Description Kuba Orlik 2020-01-28 21:05:40 UTC
When inserting some large text into a slide, some of the text has line-shaped holes in it. They seem to have a fixed position on the screen. Here are some screenshots:



Disabling Hardware acceleration solves the problem.

Steps to Reproduce:
0. Enable Hardware Acceleration in settings
1. Insert some large text (32pt is enough to see the result)
2. It looks ok while editing the slide
3. Start the presentation

Actual Results:
The text has line-shaped holes in it

Expected Results:
Text should not have line-shaped holes in it

Reproducible: Always

User Profile Reset: No

OpenGL enabled: Yes

Additional Info:
Build ID: 6.2.8-4
CPU threads: 4; OS: Linux 4.19; UI render: default; VCL: gtk3; 
Locale: en-GB (en_GB.utf8); UI-Language: en-US
Calc: threaded
Comment 1 Buovjaga 2020-05-08 18:36:51 UTC
6.2 is pretty old. Maybe try with a more recent version. An appimage is an easy method: https://libreoffice.soluzioniopen.com/

Change back to UNCONFIRMED, if the problem persists. Change to RESOLVED WORKSFORME, if the problem went away.
Comment 2 Kuba Orlik 2020-05-10 10:09:24 UTC
I've just checked 6.4 and could not reproduce the problem.
Comment 3 Kuba Orlik 2020-09-02 16:27:00 UTC
I've just checked in and the problem is back. The lines appear when the hardware acceleration is on, and disappear when the accelerations is off
Comment 4 Buovjaga 2020-09-02 16:28:36 UTC
Do they also appear, if you launch from the command line with

SAL_USE_VCLPLUGIN=gen libreoffice
Comment 5 Kuba Orlik 2020-09-03 07:35:00 UTC
With this flag the UI looks very oldschool, but the white lines are gone. Both with hardware acceleration on and off
Comment 6 Buovjaga 2020-09-03 13:06:35 UTC
Thanks, it must be somehow hardware-specific, sadly. I am not seeing the lines.

Arch Linux 64-bit
Build ID: 2db30aa0206ca3d9d5a665d550820d8fcbcff4b9
CPU threads: 8; OS: Linux 5.8; UI render: default; VCL: gtk3
Locale: fi-FI (fi_FI.UTF-8); UI: en-US
Calc: threaded
Built on 3 September 2020
Comment 7 Xisco Faulí 2021-11-23 10:54:32 UTC
Hello Kuba,
Could you please try to reproduce it with the latest version of LibreOffice from https://www.libreoffice.org/download/libreoffice-fresh/ ?
I have set the bug's status to 'NEEDINFO'. Please change it back to 'UNCONFIRMED' if the bug is still present in the latest version.
Comment 8 QA Administrators 2022-05-23 03:38:22 UTC Comment hidden (obsolete)
Comment 9 QA Administrators 2022-06-23 03:48:39 UTC
Dear Kuba Orlik,

Please read this message in its entirety before proceeding.

Your bug report is being closed as INSUFFICIENTDATA due to inactivity and
a lack of information which is needed in order to accurately
reproduce and confirm the problem. We encourage you to retest
your bug against the latest release. If the issue is still
present in the latest stable release, we need the following
information (please ignore any that you've already provided):

a) Provide details of your system including your operating
   system and the latest version of LibreOffice that you have
   confirmed the bug to be present

b) Provide easy to reproduce steps – the simpler the better

c) Provide any test case(s) which will help us confirm the problem

d) Provide screenshots of the problem if you think it might help

e) Read all comments and provide any requested information

Once all of this is done, please set the bug back to UNCONFIRMED
and we will attempt to reproduce the issue. Please do not:

a) respond via email 

b) update the version field in the bug or any of the other details
   on the top section of our bug tracker

Warm Regards,
QA Team