[Bug 66515] mesa 9.2 is causing GPU to hang on VERDE

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66515

--- Comment #19 from Mauro Carvalho Chehab <mchehab at infradead.org> ---
(In reply to comment #18)
> (In reply to comment #17)
> > Although --enable-glx-tls is not explicitly specified. But it detect whether
> > the tls is supported, and if it's supported, it will enable glx-tls which is
> > the same way what xorg's autoconf does.
> 
> Then glamor's configure --help output should reflect that.

Yep.

Anyway, I double-checked by compiling it on mock (mock gets the standard Fedora
packages, instead of my modified ones). From it, TLS seems to be enabled:

    ...
    checking for XORG... yes
    checking for DRI2... yes
    checking whether to include GLAMOR_GLES2 support... no
    checking whether to enable DEBUG... no
    checking for GL... yes
    checking for LIBDRM... yes
    checking for EGL... yes
    checking for GBM... yes
    checking for thread local storage (TLS) support... __thread
    checking for tls_model attribute support... yes
    checking that generated files are newer than configure... done

> 
> 
> > And tls is almost always supported, so that make glamor require a mesa with
> > --enable-glx-tls specified explicitly.
> 
> But if I understand correctly, Mauro is saying that this problem happens
> when Mesa is built with --enable-glx-tls, but not without...

Yes. When mesa is compiled with --enable-glx-tls, either mesa or glamor seem to
sendinvalid or incomplete commands to Cape Verde GPU on some situations (combo
boxes), causing it to wait forever to complete and hanging Xorg. The GPU itself
doesn't hang, as it is still possible to press CTRL-ALT-F2 to move to a console
terminal. So, it seems that the Kernel radeon driver remains working properly.

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