[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

            Bug ID: 108577
           Summary: Black X laptop screen with cursor if HDMI not plugged
                    in, bisected
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: duncan_roe@optusnet.com.au

Created attachment 142239
  --> https://bugs.freedesktop.org/attachment.cgi?id=142239&action=edit
Git diff specifying 2 commits (GD is aliased to git diff)

(High severity because laptop is useless when travelling)
With HDMI unplugged, X laptop screen is black with only a cursor. Cursor
changes shape as it moves over xterm windows put there by xinitrc.
Bisecting in git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git finds
2bfb0b678e48dee76543bfa2079b7e42609332fb has the problem but adjacent commit
9c24c10a2c1e1bb478b6bb70612d9e885aee044f does not.
There is an oddity with git diff between these two: git diff <commit1>
<commit2> produces copious output and a git warning (see attachment), but git
checkout <commit2>; git diff <commit1> only shows one patched file (next
attachment). You might want to try this - I re-cloned the repo in case the old
one was corrupted but it made no difference.

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #1 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Hardware is as in Bug 108139

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

Duncan Roe <duncan_roe@optusnet.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #2 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Sorry guys, just noticed that after git checkout
2bfb0b678e48dee76543bfa2079b7e42609332fb I see a bunch of new commits that
weren't there before - will bisect

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #3 from Duncan Roe <duncan_roe@optusnet.com.au> ---
The second bisect identifies 5099114ba3b2e5ae9fb487aeb3ae0434fe38a7da as the
oldest commit showing the problem, which does not show in adjacent  commit
b646c1dc835b6b73884a88643c2534f1a4a1928f.
In order to see either of these commits in git list, one first needs to git
checkout 2bfb0b678e48dee76543bfa2079b7e42609332fb.
(In reply to Duncan Roe from comment #0)
> Created attachment 142239 [details]
> Git diff specifying 2 commits (GD is aliased to git diff)
> 
> (High severity because laptop is useless when travelling)
> With HDMI unplugged, X laptop screen is black with only a cursor. Cursor
> changes shape as it moves over xterm windows put there by xinitrc.
> Bisecting in git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git finds
> 2bfb0b678e48dee76543bfa2079b7e42609332fb has the problem but adjacent commit
> 9c24c10a2c1e1bb478b6bb70612d9e885aee044f does not.
> There is an oddity with git diff between these two: git diff <commit1>
> <commit2> produces copious output and a git warning (see attachment), but
> git checkout <commit2>; git diff <commit1> only shows one patched file (next
> attachment). You might want to try this - I re-cloned the repo in case the
> old one was corrupted but it made no difference.

Please ignore the git diff stuff above. After checking out
2bfb0b678e48dee76543bfa2079b7e42609332fb, I diffed the second commit in git
list not realising that this was no longer
9c24c10a2c1e1bb478b6bb70612d9e885aee044f.
The new bisect is the valid one

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

Duncan Roe <duncan_roe@optusnet.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #4 from Duncan Roe <duncan_roe@optusnet.com.au> ---
After stripping the timestamps from good and bad copies of Xorg.0.log, the only
significant difference between them appears to be gart size. See attachment 2

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

Duncan Roe <duncan_roe@optusnet.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #142239|0                           |1
        is obsolete|                            |

--- Comment #5 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 142250
  --> https://bugs.freedesktop.org/attachment.cgi?id=142250&action=edit
Diff of cursor-only and normal Xorg logs

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #6 from Duncan Roe <duncan_roe@optusnet.com.au> ---
(In reply to Duncan Roe from comment #4)
> After stripping the timestamps from good and bad copies of Xorg.0.log, the
> only significant difference between them appears to be gart size. See
> attachment 2 [details] [review]

Sorry that is now attachment 1 after obsoleting the old one

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #7 from Duncan Roe <duncan_roe@optusnet.com.au> ---
(In reply to Duncan Roe from comment #6)
> (In reply to Duncan Roe from comment #4)
> > After stripping the timestamps from good and bad copies of Xorg.0.log, the
> > only significant difference between them appears to be gart size. See
> > attachment 2 [details] [review] [review]
> 
> Sorry that is now attachment 1 [details] [review] after obsoleting the old
> one

In any case, don't follow the auto-generated attachment hyperlink. Just open
the attachment

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #8 from Duncan Roe <duncan_roe@optusnet.com.au> ---
(In reply to Duncan Roe from comment #7)
> (In reply to Duncan Roe from comment #6)
> > (In reply to Duncan Roe from comment #4)
> > > After stripping the timestamps from good and bad copies of Xorg.0.log, the
> > > only significant difference between them appears to be gart size. See
> > > attachment 2 [details] [review] [review] [review]
> > 
> > Sorry that is now attachment 1 [details] [review] [review] after obsoleting the old
> > one
> 
> In any case, don't follow the auto-generated attachment hyperlink. Just open
> the attachment

Ah ther you go - attachment numbers are global. See attachment 142250

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |harry.wentland@amd.com,
                   |                            |nicholas.kazlauskas@amd.com
                   |                            |, sunpeng.li@amd.com

--- Comment #9 from Michel Dänzer <michel@daenzer.net> ---
Commit 5099114ba3b2e5ae9fb487aeb3ae0434fe38a7da is "drm/amdgpu/display: drop
DRM_AMD_DC_FBC kconfig option".

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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[-- Attachment #1.1: Type: text/plain, Size: 275 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #10 from Duncan Roe <duncan_roe@optusnet.com.au> ---
DRM_AMD_DC_FBC is not in my .config and never has been (from the RCS tree)

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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[-- Attachment #1.1: Type: text/plain, Size: 239 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #11 from Duncan Roe <duncan_roe@optusnet.com.au> ---
(and the patch enables DRM_AMD_DC_FBC)

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 331 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #12 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 142286
  --> https://bugs.freedesktop.org/attachment.cgi?id=142286&action=edit
Help for CONFIG_DRM_AMD_DC_FBC

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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[-- Attachment #1.1: Type: text/plain, Size: 582 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #13 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Rebuilt b646c1dc835b6b73884a88643c2534f1a4a1928f (previously OK) with
CONFIG_DRM_AMD_DC_FBC turned on and got a black X display.
The Help for this option says to check hardware availability before enabling.
Looks like my hardware doesn't have it.
I can see no way this option should be forced on. What I think was intended was
to remove CONFIG_DRM_AMD_DC as an option instead.

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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[-- Attachment #1.1: Type: text/plain, Size: 393 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #14 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Commit 5099114ba3b2e5ae9fb487aeb3ae0434fe38a7da was authored by
alexander.deucher@amd.com but Bugzilla says "CC: alexander.deucher@amd.com did
not match anything" when I try to add his email

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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[-- Attachment #1.1: Type: text/plain, Size: 267 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #15 from Alex Deucher <alexdeucher@gmail.com> ---
What chip do you have?  Please attach your xorg log and dmesg output.

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 315 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #16 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 142292
  --> https://bugs.freedesktop.org/attachment.cgi?id=142292&action=edit
O/P from dmesg

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 489 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #17 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 142293
  --> https://bugs.freedesktop.org/attachment.cgi?id=142293&action=edit
Xorg log

See also Comment 4
This log and the dmesg o/p are form a build of commit
5099114ba3b2e5ae9fb487aeb3ae0434fe38a7da to
git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 382 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #18 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 142334
  --> https://bugs.freedesktop.org/attachment.cgi?id=142334&action=edit
Patch for Linux-19.0 to revert 5099114 & reinstate DRM_AMD_DC_FBC kconfig
option

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 349 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #19 from Alex Deucher <alexdeucher@gmail.com> ---
Created attachment 142347
  --> https://bugs.freedesktop.org/attachment.cgi?id=142347&action=edit
possible fix 1/2

Do these patches fix the issue?

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 314 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #20 from Alex Deucher <alexdeucher@gmail.com> ---
Created attachment 142348
  --> https://bugs.freedesktop.org/attachment.cgi?id=142348&action=edit
possible fix 2/2

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 484 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #21 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Yes they fix Black X. I tested at Linux 4.19 (commit
84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d) with updated patches that apply
cleanly (to be attached).
I wonder if an approach like yours (checking dc->fbc_compressor or some other
flag in dc) could be used to resolve Bug 108139?

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 340 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #22 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 142350
  --> https://bugs.freedesktop.org/attachment.cgi?id=142350&action=edit
possible fix 1/2 updated for Linux 19.0

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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[-- Attachment #1.1: Type: text/plain, Size: 340 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #23 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 142351
  --> https://bugs.freedesktop.org/attachment.cgi?id=142351&action=edit
possible fix 2/2 updated for Linux 19.0

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #24 from Alex Deucher <alexdeucher@gmail.com> ---
Does just removing this line from the code:
value |= 0x84;
also fix the issue?

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

Roman Li <roman.li@amd.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |roman.li@amd.com

--- Comment #25 from Roman Li <roman.li@amd.com> ---
Created attachment 142374
  --> https://bugs.freedesktop.org/attachment.cgi?id=142374&action=edit
the latest FBC fixes

Duncan, you can also try 'the latest FBC fixes' to check whether they fix your
issue.

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #26 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 142382
  --> https://bugs.freedesktop.org/attachment.cgi?id=142382&action=edit
One-line patch as Alex requested

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #27 from Duncan Roe <duncan_roe@optusnet.com.au> ---
(In reply to Alex Deucher from comment #24)
> Does just removing this line from the code:
> value |= 0x84;
> also fix the issue?

No, I get the black screen again. To be clear, I applied the patch in 
Attachment 142382 to Linux 4.19 stable commit
84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #28 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 142384
  --> https://bugs.freedesktop.org/attachment.cgi?id=142384&action=edit
Log of applying FBC patchset

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #29 from Duncan Roe <duncan_roe@optusnet.com.au> ---
(In reply to Roman Li from comment #25)
> Created attachment 142374 [details]
> the latest FBC fixes
> 
> Duncan, you can also try 'the latest FBC fixes' to check whether they fix
> your issue.

I applied the patchset to Linux 4.19 (stable commit
84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d). Some lines were offset as per
attachment 142384.
The black screen remained.

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #30 from Alex Deucher <alexdeucher@gmail.com> ---
Can you try this patch set?
https://patchwork.freedesktop.org/series/52117/

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #31 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 142396
  --> https://bugs.freedesktop.org/attachment.cgi?id=142396&action=edit
series/52117 patches as migrated to Linux 4.19.1

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #32 from Duncan Roe <duncan_roe@optusnet.com.au> ---
X displays normally with this patch set (as amended) applied to Linux 4.19.1
commit 07a03b97b9ce2a6430344386eeab9b16283b893f on branch linux-4.19.y of the
stable tree.
There was an oddity the first time I tried it which I have not  been able to
reproduce since: the X screen went dark after timing out (as normal) but it
wouldn't light up again for keyboard presses, mouse clicks etc. I ahve tried
numerous time to reproduce this but not managed, so I have to say the patch is
good.

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #33 from Alex Deucher <alexdeucher@gmail.com> ---
Does this patch fix the issue with fbc enabled?
https://patchwork.freedesktop.org/patch/264806/

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #34 from Duncan Roe <duncan_roe@optusnet.com.au> ---
(In reply to Alex Deucher from comment #33)
> Does this patch fix the issue with fbc enabled?
> https://patchwork.freedesktop.org/patch/264806/

No. I get the black screen after entering *startx* (system boots to
command-line prompt). 
However, I let the screen time out for a long time while I went checking for
stuff. When I went to Ctrl-Alt-F1 to get back to command mode, a proper X
display appeared.
I rebooted (Had to power off owing to Bug 108464). This time I tried touching
keys as soon as I noticed X had timed out but nothing would wake it up (like
the "oddity" mentioned in Comment 32).
Trying again, last time for tonight. Have taken the precaution of starting an
xterm using my desktop's DISPLAY before starting X. Am following /var/log/debug
(set up to log everything).

    Nov 30 22:09:46 smallstar kernel: [  697.279929] [drm:dc_commit_state
[amdgpu]] dc_commit_state: 0 streams
    Nov 30 22:09:46 smallstar kernel: [  697.280185]
[drm:hwss_edp_backlight_control [amdgpu]] hwss_edp_backlight_control: backlight
action: Off
    Nov 30 22:09:46 smallstar kernel: [  697.312816] [drm:generic_reg_wait
[amdgpu]] REG_WAIT taking a while: 5ms in dce110_stream_encoder_dp_blank
line:922
    Nov 30 22:09:46 smallstar kernel: [  697.313269]
[drm:hwss_edp_power_control [amdgpu]] hwss_edp_power_control: Panel Power
action: Off
    Nov 30 22:09:46 smallstar kernel: [  697.329572] [drm:drm_mode_setcrtc
[drm]] [CRTC:40:crtc-0]
    Nov 30 22:09:46 smallstar kernel: [  697.329617] [drm:drm_mode_setcrtc
[drm]] [CRTC:42:crtc-1]
    Nov 30 22:09:46 smallstar kernel: [  697.329667] [drm:drm_mode_setcrtc
[drm]] [CRTC:40:crtc-0]

Touch the Ctrl key at 22:15:08 (I was called away) and X display shows:

    Nov 30 22:15:08 smallstar kernel: [ 1019.371568] [drm:drm_mode_setcrtc
[drm]] [CRTC:40:crtc-0]
    Nov 30 22:15:08 smallstar kernel: [ 1019.371601] [drm:drm_mode_setcrtc
[drm]] [CONNECTOR:44:eDP-1]
    Nov 30 22:15:08 smallstar kernel: [ 1019.378652] [drm:dc_commit_state
[amdgpu]] dc_commit_state: 1 streams
    Nov 30 22:15:08 smallstar kernel: [ 1019.378727] [drm:dc_stream_log
[amdgpu]] core_stream 0x00000000f8a1cb08: src: 0, 0, 1366, 768; dst: 0, 0,
1366, 768, colorSpace:1
    Nov 30 22:15:08 smallstar kernel: [ 1019.378797] [drm:dc_stream_log
[amdgpu]] ^Ipix_clk_khz: 76300, h_total: 1558, v_total: 816, pixelencoder:1,
displaycolorDepth:1
    Nov 30 22:15:08 smallstar kernel: [ 1019.378867] [drm:dc_stream_log
[amdgpu]] ^Isink name: , serial: 0
    Nov 30 22:15:08 smallstar kernel: [ 1019.378938] [drm:dc_commit_state
[amdgpu]] ^Ilink: 0
    Nov 30 22:15:08 smallstar kernel: [ 1019.379244]
[drm:dce110_compressor_disable_fbc [amdgpu]] FBC status changed to 0
    Nov 30 22:15:08 smallstar kernel: [ 1019.379501]
[drm:hwss_edp_power_control [amdgpu]] hwss_edp_power_control: Panel Power
action: On
    Nov 30 22:15:08 smallstar kernel: [ 1019.500815] [drm:enable_link_dp
[amdgpu]] Link: 0 eDP panel mode supported: 1 eDP panel mode enabled: 1 
    Nov 30 22:15:08 smallstar kernel: [ 1019.503669]
[drm:dc_link_dp_perform_link_training [amdgpu]] HBRx1 pass VS=0, PE=0
    Nov 30 22:15:08 smallstar kernel: [ 1019.504331]
[drm:hwss_edp_backlight_control [amdgpu]] hwss_edp_backlight_control: backlight
action: On
    Nov 30 22:15:08 smallstar kernel: [ 1019.516877] [drm:dc_commit_state
[amdgpu]] {1366x768, 1558x816@76300Khz}

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #35 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Tried to add a comment just now but got server failure

--- Comment #36 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Tried to add a comment just now but got server failure

--- Comment #37 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Control key straight away after timeout also brings up X display.

--- Comment #38 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Control key straight away after timeout also brings up X display.

--- Comment #39 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Regarding Comment 32, I have had the "dead screen" once more but noticed that
caps lock light would not come on. Rather looks like the keyboard has become
detached, so is a separate issue (I *am* using the laptop keyboard)

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

--- Comment #40 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 143006
  --> https://bugs.freedesktop.org/attachment.cgi?id=143006&action=edit
Diagnostic patches to determine which pointer is null

These patches are against Linux 4.19.12, commit
2a7cb228d29c3882c1414c10a44c5f3f59bfa44d in
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

Duncan Roe <duncan_roe@optusnet.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #143006|1                           |0
           is patch|                            |
 Attachment #143006|0                           |1
        is obsolete|                            |

--- Comment #41 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Comment on attachment 143006
  --> https://bugs.freedesktop.org/attachment.cgi?id=143006
Diagnostic patches to determine which pointer is null

Sorry everyone - attachment 143006 belongs to bug 108464

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[Bug 108577] Black X laptop screen with cursor if HDMI not plugged in, bisected

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https://bugs.freedesktop.org/show_bug.cgi?id=108577

Duncan Roe <duncan_roe@optusnet.com.au> changed:

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

--- Comment #42 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Since Linux 5.1, I do not see this bug any more.
So I guess it is "fixed".

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