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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Asus U38N: Black screen with Radeon driver in Linux"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73530#c90">Comment # 90</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Asus U38N: Black screen with Radeon driver in Linux"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73530">bug 73530</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 Nicolas Werner from <a href="show_bug.cgi?id=73530#c89">comment #89</a>)
<span class="quote">> (In reply to Alex Deucher from <a href="show_bug.cgi?id=73530#c88">comment #88</a>)
> > Created <span class=""><a href="attachment.cgi?id=115774" name="attach_115774" title="add some debugging output">attachment 115774</a> <a href="attachment.cgi?id=115774&action=edit" title="add some debugging output">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=73530&attachment=115774'>[review]</a> [review] [review]
> > add some debugging output
> >
> > Can you attach your dmesg output with this patch attached? It should help
> > narrow down where the dpcd info is getting corrupted.
>
> Here it is (only the relevant section):
> [ 5.534907] [drm] radeon_dp_getdpcd
> [ 5.534913] [drm] DPCD: 11 0a 84 01 00 0b 01 01 02 00 00 00 00 00 00
> [ 5.565816] [drm] fb mappable at 0xD047B000
> [ 5.565823] [drm] vram apper at 0xD0000000
> [ 5.565825] [drm] size 8294400
> [ 5.565828] [drm] fb depth is 24
> [ 5.565830] [drm] pitch is 7680
> [ 5.566022] fbcon: radeondrmfb (fb0) is primary device
> [ 5.566093] [drm] radeon_dp_set_link_config, 270000, 2
> [ 5.566095] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00</span >
Are you still hardcoding the lanes here?
<span class="quote">> [ 6.706063] [drm] radeon_dp_set_rx_power_state, 0
> [ 6.706065] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> [ 7.843201] [drm] radeon_dp_link_train
> [ 7.843203] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> [ 7.843204] [drm] dp_info dpcd: 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00
> [ 7.843206] [drm] radeon_dp_set_rx_power_state, 0
> [ 7.843206] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00</span ></pre>
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