[Bug 55228] [ivb dual-link dvi dongle] doesn't work with common DP dongle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55228

--- Comment #50 from Simon Farnsworth <simon at farnz.org.uk> ---
(In reply to aidanamarks from comment #46)
> (In reply to Simon Farnsworth from comment #43)
> > Created attachment 113346 [details] [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.

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)");
+

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