Bug 84203 - [NVC1] HDMI gives no more signal since 3.15 (optimus)
Summary: [NVC1] HDMI gives no more signal since 3.15 (optimus)
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/nouveau (show other bugs)
Version: unspecified
Hardware: Other Linux (All)
: medium normal
Assignee: Nouveau Project
QA Contact: Xorg Project Team
Depends on:
Reported: 2014-09-22 22:40 UTC by Jean-Louis Dupond
Modified: 2014-12-18 10:51 UTC (History)
2 users (show)

See Also:
i915 platform:
i915 features:

full dmesg (40.57 KB, text/plain)
2014-09-22 22:46 UTC, Jean-Louis Dupond
no flags Details

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!

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.