[Bug 98324] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[Bug 98324] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

            Bug ID: 98324
           Summary: amd-staging-4.7: problems with unblanking displays
                    when monitors are switched off
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: bugspam@moreofthesa.me.uk

Created attachment 127405
  --> https://bugs.freedesktop.org/attachment.cgi?id=127405&action=edit
Kernel log extract, showing the unblanking failure.

Setup: RX 470 with two monitors attached – one via DVI-and one via HDMI. (Both
are AOC monitors.)

* Ensure that outputs are blanked (via xset, time-out or similar).
* Switch off the monitors.
* Unblank the outputs.
* Switch on the monitors.

Invariably, in this situation, the DVI-connected monitor is unblanked and
displaying what it should be, but the HDMI-connected monitor is receiving no
signal (or at least nothing to display) and is therefore displaying nothing.

The HDMI-connected monitor can be restored by using xrandr to change mode or by
blanking and unblanking – so long as it's switched on while doing so.

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[Bug 98324] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

Darren Salt <bugspam@moreofthesa.me.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Hardware|Other                       |x86-64 (AMD64)
                 OS|All                         |Linux (All)

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[Bug 98324] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

--- Comment #1 from dwagner <jb5sgc1n.nya@20mm.eu> ---
JFYI: A similar, but more dramatic symptom that may be related I reported in
https://bugs.freedesktop.org/show_bug.cgi?id=102323

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|amd-staging-4.7: problems   |[DC] amd-staging-4.7:
                   |with unblanking displays    |problems with unblanking
                   |when monitors are switched  |displays when monitors are
                   |off                         |switched off
                 CC|                            |harry.wentland@amd.com

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

--- Comment #2 from Darren Salt <bugspam@moreofthesa.me.uk> ---
Currently running amd-staging-drm-next 0313e8bfbbdd. The behaviour is now
improved, though is still regressed vs. mainline.

Unblanking works. If I allow the problem monitor to display “no signal”, it
becomes effectively disconnected, and becomes reconnected (as if physically
freshly connected) on unblanking.

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

--- Comment #3 from Darren Salt <bugspam@moreofthesa.me.uk> ---
Created attachment 133671
  --> https://bugs.freedesktop.org/attachment.cgi?id=133671&action=edit
Kernel log showing normal blank & unblank.

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

Darren Salt <bugspam@moreofthesa.me.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #127405|0                           |1
        is obsolete|                            |

--- Comment #4 from Darren Salt <bugspam@moreofthesa.me.uk> ---
Created attachment 133673
  --> https://bugs.freedesktop.org/attachment.cgi?id=133673&action=edit
Kernel log showing blanking & as-if-reconnected unblanking.

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

--- Comment #5 from dwagner <jb5sgc1n.nya@20mm.eu> ---
JFYI: A patch attached to report
https://bugs.freedesktop.org/show_bug.cgi?id=102323 provided some improved
behaviour regarding switched-off HDMI displays.

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

--- Comment #6 from Darren Salt <bugspam@moreofthesa.me.uk> ---
That patch makes no difference to this problem.

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

--- Comment #7 from Darren Salt <bugspam@moreofthesa.me.uk> ---
Seems to be working properly with current amd-staging-drm-next (43dd6fde5df4).

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

--- Comment #8 from Darren Salt <bugspam@moreofthesa.me.uk> ---
Broken (same symptoms, though the kernel log looks a little different) with
drm-next-4.15-dc (fbf0c14dd75) (merged with 4.13.4).

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

--- Comment #9 from Darren Salt <bugspam@moreofthesa.me.uk> ---
Created attachment 134594
  --> https://bugs.freedesktop.org/attachment.cgi?id=134594&action=edit
Apparent EDID errors

HDMI monitor set to 1920×1080, but on unblanking gets set to 1152×864.

This is the second time that I've seen this. Both times it's happened on the
first unblanking after boot; both times, using drm-next-4.15-dc.

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

--- Comment #10 from Darren Salt <bugspam@moreofthesa.me.uk> ---
Created attachment 139325
  --> https://bugs.freedesktop.org/attachment.cgi?id=139325&action=edit
Good EDID output (4.17-rc3 + DC)

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

--- Comment #11 from Darren Salt <bugspam@moreofthesa.me.uk> ---
Created attachment 139326
  --> https://bugs.freedesktop.org/attachment.cgi?id=139326&action=edit
Bad EDID output (4.17-rc3 + DC)

Once this happens (after VESA blanking long enough for the problem monitor to
fully go to sleep), it persists until reboot.

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

--- Comment #12 from Edward Kigwana <edwardwwgk@gmail.com> ---
I remember this having this issue and found that switching to the console
(CTRL-ALT-F1) and then back to X once or twice woke the monitor.

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

--- Comment #13 from Darren Salt <bugspam@moreofthesa.me.uk> ---
EDID problems are gone in drm-next-4.18. However, the disconnection issue
remains.

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[Bug 98324] [DC] amd-staging-4.7: problems with unblanking displays when monitors are switched off

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https://bugs.freedesktop.org/show_bug.cgi?id=98324

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #14 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/108.

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