Re: [Thud branch][AM3354]OpenGL/QT font rendering problem - corrupt glyphs

From: Denys Dmytriyenko <denys@ti.com>
To: Ankur Tyagi <Ankur.Tyagi@gallagher.com>
Cc: "meta-arago@arago-project.org" <meta-arago@arago-project.org>
Subject: Re: [Thud branch][AM3354]OpenGL/QT font rendering problem - corrupt glyphs
Date: Wed, 19 Feb 2020 18:52:06 -0500	[thread overview]
Message-ID: <20200219235206.GX720@beryl> (raw)
In-Reply-To: <SY2PR01MB24265CF57E3A14572D8434B7E5100@SY2PR01MB2426.ausprd01.prod.outlook.com>

That is quite strange. We are wrapping up our Thud support. But it was used 
in our products for about a year with rigorous testing and we haven't seen 
anything like that on any of our platforms.

This does look like some memory corruption - are you sure you have all the 
timings correctly? Have you also switched any of the low-level components, 
like U-boot, Linux kernel, etc.?

Denys

On Wed, Feb 19, 2020 at 07:04:12PM +0000, Ankur Tyagi wrote:
> Hi,
> 
> Is there anything can be done to fix it? Let me know if some more information needs to be shared in order to help with diagnosis.
> 
> Regards
> Ankur
> 
> 
> ________________________________
> From: meta-arago-bounces@arago-project.org <meta-arago-bounces@arago-project.org> on behalf of Ankur Tyagi <Ankur.Tyagi@gallagher.com>
> Sent: Tuesday, February 18, 2020, 11:11 AM
> To: meta-arago@arago-project.org
> Subject: [meta-arago] [Thud branch][AM3354]OpenGL/QT font rendering problem - corrupt glyphs
> 
> Resending it as previous one didn’t made it to the mailing list
> 
> And we are stuck in production after upgrade to thud branch because of this issue, any help is appreciated
> 
> Regards
> Ankur
> 
> From: Ankur Tyagi
> Sent: Tuesday, 11 February 2020 12:39 PM
> To: meta-arago@arago-project.org
> Subject: [Thud branch][AM3354]OpenGL/QT font rendering problem - corrupt glyphs
> 
> Greetings,
> 
> I am using AM3354 processor. I just did a major Yocto upgrade from "daisy" to "thud" branch, and I noticed that some characters/glyphs happen to be slightly corrupt.
> The problem occurs randomly, but when a corrupted character is rendered multiple times on the screen, all of its instances are corrupted the same way.
> 
> It looks like this: https://ibb.co/LYP4JCx
> 
> I tried using various QT environment variables, but the only one that worked was QT_QUICK_BACKEND=software. However, this led to a very significant slowdown, so it's not an option.
> 
> I'm not using X11 or wayland. I'm not modifying the graphics drivers or the QT layer in any way.
> 
> Following are Qt environment variables on target:
> 
> export QT_QPA_EGLFS_INTEGRATION=none
> export QT_QUICK_CONTROLS_1_STYLE=Flat
> export QT_QPA_EGLFS_NO_LIBINPUT=1
> 
> Has anyone experienced similar problem? Is there any configuration detail I might be missing?
> 
> Regards,
> Ankur
> 
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