[Bug 36326] [uxa 915GM] Characters sometimes have horizontal lines through them (glyph font corruption)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=36326

--- Comment #83 from Paul Menzel <paulepanter at users.sourceforge.net> ---
(In reply to comment #82)
> (In reply to comment #81)
> > and applied the following patch on top of it.
> > 
> >     commit f49c3cacd25ffb78ccfff49b001ba89375044145
> >     Author: Chris Wilson <chris at chris-wilson.co.uk>
> >     Date:   Thu Jan 10 19:14:21 2013 +0000
> > 
> >         intel: Throttle harder
> > 
> > Limited testing shows that the glyph corruption is gone. Unfortunately
> > performance seems to be slower too. That means for example maximizing a
> > window it does not happen instantly and I can see how it is redrawn. So
> > basically the same behavior with `"DebugWait" "true"`, if I remember
> > correctly.
> 
> What I realised later was that Sitosfe was hitting the bug in libdrm-intel
> that was causing it to fallback to swrast. After applying that patch, you
> also need libdrm-intel-2.4.41 or just
> http://cgit.freedesktop.org/mesa/drm/commit/
> ?id=fdda97007b1dbf95beb16a0e3510fd36c89e8c33
> 
> Paul, can you update libdrm and see if the bug returns?

I applied the commit you mentioned on top of

    libdrm (2.4.40-1~deb7u2) sid; urgency=low

and rebuilt the package. Unfortunately I think there is no difference. The
glyph corruption is still gone but it is also still slow, so swrast still might
be used.

How can I check, what is used, without `glxinfo` installed? I could not spot
anything useful in `/var/log/Xorg.0.log`.

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