[Bug 100023] [SKL] LSPCon and DisplayPort always output limited range RGB, even when it should output full range RGB

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100023

N. W. <nw9165-3201 at yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #17 from N. W. <nw9165-3201 at yahoo.com> ---
(In reply to Jani Nikula from comment #16)
> Please install some recent kernel

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 comment #16)
> add drm.debug=14 module parameter,
> reproduce the problem, and attach dmesg to the bug.

What part of dmesg do you need?

(In reply to Jani Nikula from comment #16)
> 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.

$ 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?

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