Bug 84203

Summary: [NVC1] HDMI gives no more signal since 3.15 (optimus)
Product: xorg Reporter: Jean-Louis Dupond <jean-louis>
Component: Driver/nouveauAssignee: Nouveau Project <nouveau>
Status: RESOLVED FIXED QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium CC: bigon, jean-louis
Version: unspecified   
Hardware: Other   
OS: Linux (All)   
i915 platform: i915 features:
Description Flags
full dmesg none

Description Jean-Louis Dupond 2014-09-22 22:40:48 UTC
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.

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              


After some git bisect playtime, I found out the following commit caused the issue:

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
Comment 1 Jean-Louis Dupond 2014-09-22 22:46:52 UTC
Created attachment 106697 [details]
full dmesg

Attached a full dmesg.

The last lines are when I stop lightdm, and runpm stops the nvidia card.
This also causes shutdown to hang.
Comment 2 Jean-Louis Dupond 2014-10-03 18:33:02 UTC
Seems like Ben fixed this issue:

Used that commit on my kernel, and it fixes the issue!
Great! Thx!

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