Bug 111769

Summary:

DP-1-2-8 driven at boot, off in X, driven at shutdown

Product:

DRI

Reporter:

Tony Vroon <tony>

Component:

DRM/Intel

Assignee:

Intel GFX Bugs mailing list <intel-gfx-bugs>

Status:

RESOLVED FIXED

QA Contact:

Intel GFX Bugs mailing list <intel-gfx-bugs>

Severity:

not set

Priority:

high

CC:

intel-gfx-bugs, lyude, manasi.d.navare

Version:

DRI git

Keywords:

regression

Hardware:

x86-64 (AMD64)

OS:

Linux (All)

Whiteboard:

i915 platform:

KBL

i915 features:

display/DP MST

Attachments:

Description	Flags
dmesg	none
Xorg.0.log	none
git.diff	none

Description Tony Vroon 2019-09-23 10:33:29 UTC

On my Dell XPS 9560, and Linus post-5.3 git tree, my Dell U3415W is no longer driven from X. The screen goes into standby, and attempting to use it shows:
$ xrandr --output DP-1-2-8 --above eDP-1 --auto
xrandr: cannot find crtc for output DP-1-2-8

Note that the screen lights up during boot, as it always did. Once lightdm is started, the screen turns off. When I shut the machine down and X terminates, the screen lights back up.

I will be adding attachments shortly.

Comment 1 Tony Vroon 2019-09-23 10:35:17 UTC

Created attachment 145467 [details]
dmesg

dmesg output with DRM debug, covering boot and X turn-up

Comment 2 Tony Vroon 2019-09-23 10:35:50 UTC

Created attachment 145468 [details]
Xorg.0.log

Xorg log with the "modeset" driver

Comment 3 Tony Vroon 2019-09-23 10:39:07 UTC

Created attachment 145469 [details] [review]
git.diff

I currently set enable_guc to 2, as I find the graphics behave better with this firmware loaded. I find behaviour is the same with enable_guc set to 0 or 2, and can test in either scenario for you.

Comment 4 Tony Vroon 2019-09-23 10:39:46 UTC

The bad commit for me is:
commit 574cc4539762561d96b456dbc0544d8898bd4c6e
Merge: 3c2edc36a774 945b584c94f8
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Thu Sep 19 16:24:24 2019 -0700

    Merge tag 'drm-next-2019-09-18' of git://anongit.freedesktop.org/drm/drm

Comment 5 Jani Nikula 2019-09-23 10:54:36 UTC

(In reply to Tony Vroon from comment #4)
> The bad commit for me is:
> commit 574cc4539762561d96b456dbc0544d8898bd4c6e
> Merge: 3c2edc36a774 945b584c94f8
> Author: Linus Torvalds <torvalds@linux-foundation.org>
> Date:   Thu Sep 19 16:24:24 2019 -0700
> 
>     Merge tag 'drm-next-2019-09-18' of git://anongit.freedesktop.org/drm/drm

Since you're able to bisect, any chance you could bisect into that merge, please? I hope Manasi and Lyude can look into this, but in the mean time bisecting to the actual regressing non-merge commit might be the quickest route to fixing this.

Comment 6 Tony Vroon 2019-09-23 11:00:35 UTC

> Since you're able to bisect, any chance you could bisect into that merge,
> please?

I've not had to bisect into a merge before, do you have a quick guide you can link to?

Comment 7 Ville Syrjala 2019-09-23 12:35:18 UTC

Already fixed with

commit e838bfa8e170415fa3cc8e83ecb171e809c0c422
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Tue Sep 3 18:40:18 2019 +0300

    Revert "drm/i915: Fix DP-MST crtc_mask"


Looks like it hasn't made it into Linus's tree yet.

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