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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [NV50, bisected, RFC patch] xset dpms force {on,off} does not work over DP"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76483#c24">Comment # 24</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [NV50, bisected, RFC patch] xset dpms force {on,off} does not work over DP"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76483">bug 76483</a>
from <span class="vcard"><a class="email" href="mailto:skeggsb@gmail.com" title="Ben Skeggs <skeggsb@gmail.com>"> <span class="fn">Ben Skeggs</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=76483#c23">comment #23</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=102016" name="attach_102016" title="dmesg from garbled display">attachment 102016</a> <a href="attachment.cgi?id=102016&action=edit" title="dmesg from garbled display">[details]</a></span>
> dmesg from garbled display</span >
Not sure if/why it's causing a garbled display, but I did spot one bug from the
log that's causing link retraining when it's not needed:
<a href="http://cgit.freedesktop.org/~darktama/nouveau/commit/?id=acc79e940a096657651980eb140176921a658e0c">http://cgit.freedesktop.org/~darktama/nouveau/commit/?id=acc79e940a096657651980eb140176921a658e0c</a>
<span class="quote">>
> The interesting thing here is that I waited for the dpms timeout, and the
> screen flashed and came back on more or less immediately, but clean. It's
> as if something decided that the DPMS-off transition was "activity" and
> turned the screen back on, properly this time. I don't think that's a
> driver issue though.</span >
I hope this is just the monitor being really confused as a result of whatever
went wrong before it. If it's not, your monitor is doing the wrong thing and
it's going to cause it to immediately resume from a power off (we can work
around the problem if it's necessary). But, in your log, your monitor is
saying "help! i lost the link! retrain me!" in response to DP_SET_POWER_D3,
which it is *explicitly* (according to the DP spec, and, well, common sense)
not supposed to do.</pre>
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