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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [ivb dual-link dvi dongle] doesn't work with common DP dongle"
href="https://bugs.freedesktop.org/show_bug.cgi?id=55228#c50">Comment # 50</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [ivb dual-link dvi dongle] doesn't work with common DP dongle"
href="https://bugs.freedesktop.org/show_bug.cgi?id=55228">bug 55228</a>
from <span class="vcard"><a class="email" href="mailto:simon@farnz.org.uk" title="Simon Farnsworth <simon@farnz.org.uk>"> <span class="fn">Simon Farnsworth</span></a>
</span></b>
<pre>(In reply to aidanamarks from <a href="show_bug.cgi?id=55228#c46">comment #46</a>)
<span class="quote">> (In reply to Simon Farnsworth from <a href="show_bug.cgi?id=55228#c43">comment #43</a>)
> > Created <span class=""><a href="attachment.cgi?id=113346" name="attach_113346" title="Debugging patch on top of v4 patch">attachment 113346</a> <a href="attachment.cgi?id=113346&action=edit" title="Debugging patch on top of v4 patch">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=55228&attachment=113346'>[review]</a> [review] [review]
> > Debugging patch on top of v4 patch
> >
> > Also, if you have a chance, can you apply this debugging patch on top of v4
> > and get me a fresh failure dmesg?
> >
>
> The patch failed to apply on top of v4. It's trying to patch functions that
> don't exist. It looks like the patch is meant for v3? Can you check
> please? I'm not sure where you wanted the debug with v4.</span >
I generated the debug patch on top of the v4 patch; if it's trying to patch
functions that don't exist, then you don't have the v4 patch applied to your
kernel.
That would fit with the parameter not existing; it's created by the following
lines from the v4 patch:
+static int dp_aux_i2c_transfer_size __read_mostly = DP_AUX_MAX_PAYLOAD_BYTES;
+module_param_unsafe(dp_aux_i2c_transfer_size, int, 0644);
+MODULE_PARM_DESC(dp_aux_i2c_transfer_size,
+ "Number of bytes to transfer in a single I2C over DP AUX CH
message, (1-16, default 16)");
+</pre>
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