[Bug 88584] [ilk] Font and screen corruption in GTK+ applications

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88584

--- Comment #35 from Giuseppe Pandolfo <giuseppe.pandolfo at xerox.com> ---
Having random and low occurrence rate issues with font distortions, missing
text, and blocked character fonts.  It looks to be an XORG server side issue
and possibly an Intel X11 video driver issue.  If I run a separate X11
client/process like the GTK3-DEMO, this separate client also sees font problems
as well. 

I took a snapshot on October 17, 2016 of the Intel X11 video driver from 
“https://cgit.freedesktop.org/xorg/driver/xf86-video-intel” but I'm still
seeing the same problem.

According to “https://wiki.archlinux.org/index.php/intel_graphics”,  there are
two things to try to get around font issues:

• Disable SNA acceleration and move to UXA. ( In Troubleshooting section under
“SNA”.)

• Set Environment variable “COGL_ATLAS_DEFAULT_BLIT_MODE=framebuffer”


I tried using “COGL_ATLAS_DEFAULT_BLIT_MODE=framebuffer” but unfortunately it
didn’t resolve the problem.  The “SNA” acceleration has the option of
“TearFree” support so the option of trying to disabling SNA and switch to UXA
produces screen tearing so I need to stick with SNA acceleration.

Also choosing either “copy-tex-sub-image” or “get-tex-data” for
COGL_ATLAS_DEFAULT_BLIT_MODE will significantly impact the UI’s GPU usage, so
this would not be an option.  

The only recovery is to restart XORG and the applications!

Does Intel have any insight on this issue?

The Open Source community has being looking for the 3.x release of the Intel
X11 video driver.  How is that coming along?

Here's my current System environment:
===================================
•       Intel HD Graphics device ID: 0F31
•       x86_64 system architecture 
•       XORG version 1.15.0
•       xf86-video-intel version 2.99.917-713-geb01cc5
>From “git clone
https://anongit.freedesktop.org/git/xorg/driver/xf86-video-intel.git” on 
October 17 ,2016
•       kernel version: 3.10.62
•       Linux distribution: WindRiver 6.0
•       Motherboard : Intel Bay Trail
•       Display connector:  eDP1
•       Occurrence rate is low and random, with no reproducible scenario. 


Attached are:
=====================
•       CorruptedFonts.png  - Example of an occurrence. 
•       xorg.conf - XORG configuration file used at runtime.

Currently this is the XORG startup options used:
=====================================                                          
Xorg :2 -ac -br -bs -r -nocursor -s 0 -v -dpms -nolisten tcp -extension XVideo
+extension Composite -extension XFree86-VidModeExtension -extension XFree86-DGA
+extension X-Resource +extension DPMS +extension DAMAGE +extension "Generic
Events" +extension DOUBLE-BUFFER  +extension RANDR -noreset vt02 -logfile
/var/log/ui/Xorg.log -logverbose 10 -fp /opt/xorg/share/fonts/X11/misc  -config
/opt/xorg/share/X11/xorg.conf.d/xorg.conf

Thank you for your support!

Giuseppe Pandolfo

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