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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#c101">Comment # 101</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>Created <span class=""><a href="attachment.cgi?id=115801" name="attach_115801" title="leave panel power on all th time">attachment 115801</a> <a href="attachment.cgi?id=115801&action=edit" title="leave panel power on all th time">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=73530&attachment=115801'>[review]</a>
leave panel power on all th time
(In reply to Nicolas Werner from <a href="show_bug.cgi?id=73530#c98">comment #98</a>)
<span class="quote">> [ 5.722365] [drm:radeon_dp_set_link_config] *ERROR* corrupt dpcd, updating
> [ 5.722952] [drm] radeon_dp_set_link_config, ffff8802a1878c00, 540000, 1
> [ 5.722953] [drm] dig_connector ffff8802a335fd60
> [ 5.722954] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> [ 6.865341] [drm:radeon_dp_set_rx_power_state] *ERROR* corrupt dpcd,
> updating
> [ 6.865932] [drm] radeon_dp_set_rx_power_state, ffff8802a1878c00, 0
> [ 6.865933] [drm] dig_connector ffff8802a335fd60
> [ 6.865934] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> [ 8.001613] [drm:radeon_dp_link_train] *ERROR* corrupt dpcd, updating
> [ 8.002284] [drm] radeon_dp_link_train, ffff8802a1878c00
> [ 8.002285] [drm] dig_connector ffff8802a335fd60
> [ 8.002287] [drm] DPCD: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> [ 8.002287] [drm] dp_info dpcd: 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00</span >
For some reason the DPCD reads back unreliably. It's all zeros the first few
times.
<span class="quote">> [ 8.002289] [drm:radeon_dp_set_rx_power_state] *ERROR* corrupt dpcd,
> updating
> [ 8.002594] [drm] radeon_dp_getdpcd ffff8802a1878c00
> [ 8.002595] [drm] dig_connector ffff8802a335fd60
> [ 8.002595] [drm] DPCD: 11 0a 02 00 00 00 00 00 00 00 00 00 00 00 00</span >
Finally it reads back correctly, but at this point it's too late.
<span class="quote">> [ 8.002597] [drm] radeon_dp_set_rx_power_state, ffff8802a1878c00, 17
> [ 8.002598] [drm] dig_connector ffff8802a335fd60
> [ 8.002599] [drm] DPCD: 11 0a 02 00 00 00 00 00 00 00 00 00 00 00 00
> [ 8.010706] [drm:radeon_dp_link_train_cr] *ERROR* clock recovery tried 5
> times
> [ 8.010707] [drm:radeon_dp_link_train_cr] *ERROR* clock recovery failed</span >
Does this patch help the reliability any?</pre>
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