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<body><span class="vcard"><a class="email" href="mailto:nw9165-3201@yahoo.com" title="N. W. <nw9165-3201@yahoo.com>"> <span class="fn">N. W.</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] LSPCon and DisplayPort always output limited range RGB, even when it should output full range RGB"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100023">bug 100023</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEEDINFO
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<td>NEW
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] LSPCon and DisplayPort always output limited range RGB, even when it should output full range RGB"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100023#c17">Comment # 17</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] LSPCon and DisplayPort always output limited range RGB, even when it should output full range RGB"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100023">bug 100023</a>
from <span class="vcard"><a class="email" href="mailto:nw9165-3201@yahoo.com" title="N. W. <nw9165-3201@yahoo.com>"> <span class="fn">N. W.</span></a>
</span></b>
<pre>(In reply to Jani Nikula from <a href="show_bug.cgi?id=100023#c16">comment #16</a>)
<span class="quote">> Please install some recent kernel</span >
The issue is still there with kernel 4.16.7 and latest MegaChips MCDP2800
LSPCON firmware, nothing has changed, it still defaults to 16-235 even though
it's connected to a DVI-D 0-255 input.
(In reply to Jani Nikula from <a href="show_bug.cgi?id=100023#c16">comment #16</a>)
<span class="quote">> add drm.debug=14 module parameter,
> reproduce the problem, and attach dmesg to the bug.</span >
What part of dmesg do you need?
(In reply to Jani Nikula from <a href="show_bug.cgi?id=100023#c16">comment #16</a>)
<span class="quote">> Please ensure you have CONFIG_DRM_DP_AUX_CHARDEV=y, and do:
>
> # dd if=/dev/drm_dp_aux0 > dpcd
>
> Attach the result to the bug. If dd fails, please try ddrescue instead.</span >
$ sudo dd if=/dev/drm_dp_aux0 > dpcd
dd: error reading '/dev/drm_dp_aux0': Connection timed out
0+0 records in
0+0 records out
0 bytes copied, 0,267088 s, 0,0 kB/s
$ sudo ddrescue /dev/drm_dp_aux0 /home/user/Documents/outputfile
GNU ddrescue 1.23
Press Ctrl-C to interrupt
ipos: 74240 B, non-trimmed: 0 B, current rate: 0 B/s
opos: 74240 B, non-scraped: 973824 B, average rate: 0 B/s
non-tried: 0 B, bad-sector: 74752 B, error rate: 512 B/s
rescued: 0 B, bad areas: 2, run time: 43s
pct rescued: 0.00%, read errors: 162, remaining time: n/a
time since last successful read: n/a
Scraping failed blocks... (forwards)
How long is that supposed to run? It seems to run for a long time without
anything happening (outputfile stays empty). Are the commands correct?</pre>
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