[Nouveau] [Bug 84203] New: HDMI gives no more signal

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84203

          Priority: medium
            Bug ID: 84203
          Assignee: nouveau at lists.freedesktop.org
           Summary: HDMI gives no more signal
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jean-louis at dupond.be
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

This week I tried HDMI again on my system, and noticed it was completely
broken.
Got just no signal on my screen.

I knew it was working some months (and upgrades) ago.
After testing I found out the issue was introduced between kernel v3.14 and
v3.15.

Situation:
Insert HDMI cable into my laptop, and no signal on the external display.

The dmesg fills with errors also:
[  186.210622] nouveau E[   PDISP][0000:01:00.0] INVALID_STATE [UNK08] chid 0
mthd 0x0080 data 0x00000000
[  186.210627] nouveau E[   PDISP][0000:01:00.0] Core:
[  186.210634] nouveau E[   PDISP][0000:01:00.0]     0x0084: 0x5dc34da1 ->
0x80000000
[  186.210640] nouveau E[   PDISP][0000:01:00.0]     0x0088: 0x00000000         

etc.

After some git bisect playtime, I found out the following commit caused the
issue:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/nouveau?id=05c63c2ff23a80b654d6c088ac3ba21628db0173

So I went back to stable 3.16 (Ubuntu Utopic version), and did a git revert for
that commit.
And yep, HDMI output was working again, and no more nouveau errors in dmesg.


My device:
[   30.823267] nouveau  [  DEVICE][0000:01:00.0] BOOT0  : 0x0c1a00a1
[   30.823269] nouveau  [  DEVICE][0000:01:00.0] Chipset: GF108 (NVC1)
[   30.823270] nouveau  [  DEVICE][0000:01:00.0] Family : NVC0

Laptop dell xps 15 l502x

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