[Bug 30647] XServer segfaults when EXANoUploadToScreen is set.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=30647

Michel Dänzer <michel at daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX

--- Comment #3 from Michel Dänzer <michel at daenzer.net> 2010-10-07 02:42:31 PDT ---
(In reply to comment #2)
> I agree it's a useful optimization and WONTFIX is fine with me, although I
> think it would be cleaner to disable EXANoUploadToScreen option,

Not possible, it's an option of the "exa" module, which doesn't know that the
driver really needs the UploadToScreen hook.

> or at least mention it in exa(4) that this option causes segfault with radeon
> driver.

If anything it should rather be documented with the driver.


> I was trying this option because of bug 30188, which gives me
> EVERGREENUploadToScreen in the backtrace, and was hoping EXANoUploadToScreen
> option would fix it, unfortunately it doesn't.

Trying to work around that problem really requires the
UploadTo/DownloadFromScreen hooks. The issue is that there is still sometimes
direct CPU access to VRAM.

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