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Linux From Scratch This Forum is for the discussion of LFS.
LFS is a project that provides you with the steps necessary to build your own custom Linux system.

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Old 02-03-2020, 07:40 AM   #1
Keith Hedger
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Registered: Jun 2010
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QTWebengine apps displays blank page in LFS 9.0.


I have a weird problem with qtwebengine on lfs 9.0 stable, it wont display any page data, I have tried both local and remote files, in falkon ( for instance ) everything displays fine, controls einput boxes etc, but entering a url just produces a blank tab, selecting 'New tab' doesn't display speed dial, jus a blank tab, selecting bookmark etc does the same.

I also get the same results when using the simple browser example, all controls etc are OK but wont display a URL, same with the minimal example.

Doesn't matter if I select a remote URL or local one, on or off the commandline.

Chromium & links work fine as normal user or root, so not a permmision/connection problem.

QT5 compiles/installs with no error, QTWebkit compiles/installs with no error, falkon and the examples from webkit likewise.

Everything works as expected in my 8.2 system.

Googled my a** off but nothing, rebuilt qt5/webkit/entire system no change.

VERY oddly if I cp my falkon config files to the 9.0 system cached pages display fine in falkon, I can follow links etc but opening a link in a new tab/window displays nothing again.

Extra Info:
No errors displayed using minimal example, but when using falkon I get this in 9.0
Code:
QWebEngineUrlScheme::registerScheme: Too late to register scheme "falkon"
QWebEngineUrlScheme::registerScheme: Too late to register scheme "extension"
Please register the custom scheme 'falkon' via QWebEngineUrlScheme::registerScheme() before installing the custom scheme handler.
Please register the custom scheme 'extension' via QWebEngineUrlScheme::registerScheme() before installing the custom scheme handler.
Use of deprecated not thread-safe setter, use setUrlRequestInterceptor instead.

Last edited by Keith Hedger; 02-03-2020 at 07:48 AM. Reason: xtra info
 
Unread 02-03-2020, 11:40 AM   #2
teckk
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I don't know if I point you in the right direction. Qt, falkon, qt5-webengine, change all the time. And depends have to match. And all of the depends of the depends. And there are also patches for it looks like. That's what package managers and maintainers are for.

I'm a month out of date, but this what I have.
Falkon 3.1.0
Qt5<stuff> 5.14.0

Source
https://download.kde.org/stable/falk...n-3.1.0.tar.xz
There are 2 patches
https://cgit.kde.org/falkon.git/patch/?id=479933e0
https://cgit.kde.org/falkon.git/patch/?id=bbde5c69

Changelog is a little sparse
https://www.falkon.org/2019/03/19/falkon-310-released/

Maybe someone else has more.
 
Unread 02-03-2020, 12:41 PM   #3
Keith Hedger
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thx i will look in to it but it is NOT a problem specific to falkon as the webkit examples display the same behaviour, ie no display of html pagea
 
Unread 02-03-2020, 01:03 PM   #4
teckk
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Did you see these?

https://bugs.launchpad.net/ubuntu/+s...n/+bug/1836938
https://bugs.kde.org/show_bug.cgi?id=405852
https://bugzilla.redhat.com/show_bug.cgi?id=1778453
 
Unread 02-03-2020, 01:36 PM   #5
Keith Hedger
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yes seen these, this is notwhat happens i get a bkank tab/widget from webkit NO errors dispkayed other widgets display fine, window displays fine thx
 
Unread 02-05-2020, 09:29 AM   #6
bryan_S
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As i wrote in another post (can't find it at the moment) - I fixed this by compiling qt-webengine _without_ the "qtwebengine-5.13.0-background_rendering_fix-1" patch. This is for a desktop system with AMD (Radeon) graphics if that means anything.

I have since dropped qt-webengine in favor of qt-webkit with the otter-brower instead of falkon. I only used falkon for browsing local web-pages anyway and webengine takes so long to build - might as well try building chromium as that.
 
1 members found this post helpful.
Unread 02-05-2020, 09:39 AM   #7
Keith Hedger
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Thanks I will try that and the otta browser, just trying upgrading qt5/webengine to 5.14.1 which doesnt use that patch, i will post back if it works, it just takes sooooooo llloooooonnnggg to compile these two.
 
Unread Yesterday, 07:00 AM   #8
Keith Hedger
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Quote:
Originally Posted by bryan_S View Post
As i wrote in another post (can't find it at the moment) - I fixed this by compiling qt-webengine _without_ the "qtwebengine-5.13.0-background_rendering_fix-1" patch. This is for a desktop system with AMD (Radeon) graphics if that means anything.

I have since dropped qt-webengine in favor of qt-webkit with the otter-brower instead of falkon. I only used falkon for browsing local web-pages anyway and webengine takes so long to build - might as well try building chromium as that.
THANKS!!!!

That done the trick, if I could give u more rep I would!
Been going round and round in circles over this, what a stupid patch! obviously not checked properly.

Usually I have nothing but praise for the great job the (B)LFS dev do, but frankley vers 9 has been a right mess, they just seem to have lost the plot with this one, seems they just compile the software and if it doesn't throw up any errors it gets passed as working, I know they have limited time/resources and can't check every thing but come on, this should have been caught, I dont't have anything particully weird in the way of hardware, guess they just had an off week! I still think they do a good job on the whole.
 
  


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