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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91880#c64">Comment # 64</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91880">bug 91880</a>
from <span class="vcard"><a class="email" href="mailto:alexdeucher@gmail.com" title="Alex Deucher <alexdeucher@gmail.com>"> <span class="fn">Alex Deucher</span></a>
</span></b>
<pre>(In reply to Julian from <a href="show_bug.cgi?id=91880#c63">comment #63</a>)
<span class="quote">> At first I thought it was an issue with the writeback feature that caches
> certain register values because it also caches an rptr value that is used in
> the driver's gpu_lockup_check and is, to my knowledge, never actually
> written to.</span >
More likely it never gets written because the GPU has hung due to something
else.
<span class="quote">>
> Buuut using radeon.no_wb=1 doesn't help. So if I've found a bug it is not
> the culprit of the lockups.</span >
The no_wb option isn't really applicable on newer chips and most likely won't
work. Newer hw does not support the necessary features to not support wb.
It's mainly a leftover from the early radeons.</pre>
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