Bug 202533

Summary: DVI Monitors blank in 4.20-6 kernel
Product: Drivers Reporter: acollier21
Component: Video(DRI - non Intel)Assignee: drivers_video-dri
Status: NEW ---    
Severity: normal CC: imirkin
Priority: P1    
Hardware: Intel   
OS: Linux   
Kernel Version: 4.20 Subsystem:
Regression: No Bisected commit-id:
Attachments: xorg log
dmesg log
attachment-27340-0.html

Description acollier21 2019-02-09 04:48:50 UTC
Running Fedora 29 with a Dell Precision M4700 and a Dell Pro2x dock. Has the K1000 Nvidia card. Under the 4.19 kernel I was able to have all 3 of my external monitors hooked up and working properly. Anytime I've tried booting into any 4.20 kernel, only my VGA monitor will display, and the other two are blank. Currently running the Nouveau drivers. I keep testing each 4.20 kernel that comes out but none of them have fixed the issue.

Running on Gnome 3.30 under x11 if that matters.
Comment 1 Ilia Mirkin 2019-02-09 06:02:44 UTC
There weren't a ton of changes to nouveau between 4.19 and 4.20. Can you do a bisect?

There were some changes to add support for HDMI 2.0, but only on GM20x GPUs (you have a GK10x GPU, which is earlier). And a handful of fixes to MST-related object lifetime management. It's likely that you have a MST dock, but those changes don't seem like they would cause anything that drastic.

Please include dmesg and xorg logs.
Comment 2 acollier21 2019-02-09 16:36:35 UTC
Created attachment 281081 [details]
xorg log
Comment 3 acollier21 2019-02-09 16:37:17 UTC
Created attachment 281083 [details]
dmesg log
Comment 4 acollier21 2019-02-09 16:39:34 UTC
Attached the logs, hopefully those help!
Comment 5 Ilia Mirkin 2019-02-09 20:57:17 UTC
Doesn't seem like nouveau is loaded at all. Probably related to not being able to get anything to come up on those screens...
Comment 6 acollier21 2019-02-10 02:41:23 UTC
Created attachment 281085 [details]
attachment-27340-0.html

Anything else I can try to do?

On Sat, Feb 9, 2019 at 12:57 PM <bugzilla-daemon@bugzilla.kernel.org> wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=202533
>
> --- Comment #5 from Ilia Mirkin (imirkin@alum.mit.edu) ---
> Doesn't seem like nouveau is loaded at all. Probably related to not being
> able
> to get anything to come up on those screens...
>
> --
> You are receiving this mail because:
> You reported the bug.
Comment 7 Ilia Mirkin 2019-02-10 02:47:39 UTC
You could try loading nouveau... or removing the configuration that is preventing it from loading...
Comment 8 acollier21 2019-02-18 21:17:28 UTC
Thanks for your patience. Figured out the error. For whatever reason, there was a blacklist file in /etc/modprobe.d/ that was blacklisting the nouveau drivers. 4.20 recognized the blacklist while 4.19 did not. 

Thanks for your direction!