Bug#818179: I too have this issue on AMD card with glamor acceleration

Laszlo KERTESZ laszlo.kertesz at gmail.com
Mon Mar 21 09:34:58 UTC 2016


I too have this issue - for me it appeared after the xserver-xorg-core
upgrade to 2:1.18.2-1.  I run Debian Testing.
It affects firefox, firefox-esr, iceweasel, even the standard Firefox
(downloaded from the net) and seamonkey-mozilla-build (from the ubuntuzilla
PPA) exhibits this issue.
The issue cannot be reproduced with an Intel IGP (Debian Testing).

I have a Radeon HD 8570D video card (which actually uses the r600g driver
being a Richland GPU), from a A8-6500 APU. But i use the glamor
acceleration with it.

I tried new profiles firefox/firefox-esr and seamonkey but to the same
effect.
If i set in the "about:config" address "gfx.content.azure.backends" to
"skia", the issue goes away, but then font rendering is broken. No other
program outside firefox and derivates i saw exhibited this issue.

I have:

kernel 4.4.0-1-amd64 (from testing)
mesa 11.1.2-1 (from testing)
xserver-xorg 1:7.7+14 (from testing)
xserver-xorg-core 2:1.18.2-1 (from testing)
xserver-xorg-video-radeon 1:7.6.1-1+b1 (from testing)

I suspect the X server's glamor acceleration (which is used by default on
radeonsi cards) is somehow the culprit here. The 1.18.2 xserver changelog
<https://lists.x.org/archives/xorg-announce/2016-March/002681.html>
mentions lots fixes and enhancements related to it.

Maybe this one from Keith Packard?

glamor: Use GL_RED instead of GL_ALPHA if we have texture_swizzle (v3)
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