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Date:      Thu, 24 Mar 2016 02:38:23 +0000
From:      bugzilla-noreply@freebsd.org
To:        gecko@FreeBSD.org
Subject:   [Bug 199310] [TTM][DRM]Artifact in graphic/Font rendering problem(artifact/gaps/missing characters/black line instead text) with radeon on 10.2/10.3-RC2/3-RELEASE/10-STABLE
Message-ID:  <bug-199310-21738-gmca6XDTrm@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-199310-21738@https.bugs.freebsd.org/bugzilla/>
References:  <bug-199310-21738@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D199310

sasamotikomi@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|www/firefox: Font rendering |[TTM][DRM]Artifact in
                   |problem on 10-STABLE        |graphic/Font rendering
                   |                            |problem(artifact/gaps/missi
                   |                            |ng characters/black line
                   |                            |instead text) with radeon
                   |                            |on
                   |                            |10.2/10.3-RC2/3-RELEASE/10-
                   |                            |STABLE

--- Comment #14 from sasamotikomi@gmail.com ---
(In reply to Koop Mast from comment #13)
This isn't font or firefox(gecko) it's cleanly TTM/DRM regression, same
situation reported with even more powerful graphic but intel(HD4000) on
@freebsd-x11 (with faster acceleration method SNA instead EXA font rendering
back again to normal state) :
1) Some commit to TTM broke it but due problem repeatable on intel graphic =
too=20
it's possibly not TTM itself but AGP in TTM.=20
2) Some commit to DRM broke it due I found it before long TTM AGP patch lan=
ded
this look reasonable.=20
3) No AGP-speed support in sysctl
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D202408
4) Alternative acceleration method Glamor currently disabled
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D207705
Possible solutions:
1) Update TTM/DRM code to last on (sync with kernel 4.5) due kernel before
~3.18-4.X contains many problems with old GPU.
2) Get to work Glamor.
3) Add sysctl for AGP.

--=20
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