[Bug 199619] New: screen stays dark for long on bootup since kernel 4.17.0-rc2+

[Bug 199619] New: screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

            Bug ID: 199619
           Summary: screen stays dark for long on bootup since kernel
                    4.17.0-rc2+
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.17.0-rc2+
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: estellnb@elstel.org
        Regression: No

When I boot with kernel 4.17.0-rc2+ the screen stays dark for more than 2
minutes before the GUI appears. This is a regression towards 4.16.0-rc3+ where
the GUI had appeared immediately when Xorg had started up.

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

--- Comment #1 from Michel Dänzer (michel@daenzer.net) ---
Please attach the dmesg output from 4.17.0-rc2+, captured after the GUI has
appeared.

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

--- Comment #2 from Elmar Stellnberger (estellnb@elstel.org) ---
Created attachment 275797
  --> https://bugzilla.kernel.org/attachment.cgi?id=275797&action=edit
dmesg with 4.17.0-rc3+ after bootup

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

--- Comment #3 from Elmar Stellnberger (estellnb@elstel.org) ---
persists with 4.17.0-rc4+

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

Ant (untaintableangel@hotmail.co.uk) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |untaintableangel@hotmail.co
                   |                            |.uk

--- Comment #4 from Ant (untaintableangel@hotmail.co.uk) ---
Sounds like the same bug I had
https://bugzilla.kernel.org/show_bug.cgi?id=199567
that started with rc2 onwards as well. Have a look at my findings (including
the kernel commit that caused it) and see if it's the same issue.

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

--- Comment #5 from Elmar Stellnberger (estellnb@elstel.org) ---
The issue persists with kernel 4.17.0+.

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

--- Comment #6 from Elmar Stellnberger (estellnb@elstel.org) ---
This applies to the nouveau driver.

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

Giorgio (giorgio.colacchio@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |giorgio.colacchio@gmail.com

--- Comment #7 from Giorgio (giorgio.colacchio@gmail.com) ---
Hi Elmar,
I don’t know if it may be of help, anyway I have a similar problem: the point
is that my problem does not seem related to graphic drivers. My OS is
Slackware64 14.2, kernel 4.17.0. At boot, after the usual kernel messages, this
is what I see, at the end, on the screen (please, note that I boot in non
graphical mode, that is in init 3):

Welcome to Linux 4.17.0 (tty1)

darkstar login: [   15.869206] wlan0: authenticate with 64:59:f8:cd:3a:88
[   15.887504] wlan0: send auth to 64:59:f8:cd:3a:88 (try 1/3)
[   15.892825] wlan0: authenticated
[   15.895108] wlan0: associate with 64:59:f8:cd:3a:88 (try 1/3)
[   15.899592] wlan0: RX AssocResp from 64:59:f8:cd:3a:88 (capab=0x411 status=0
aid=3)
[   15.900872] wlan0: associated

as you can see, after the welcome message I can’t insert my login username – 
because of the extra messages related to wlan authentication/association –  and
as a consequence the system gets stuck.  However, (in my case) we are dealing
here with a “trivial” bug, since it suffices to press Enter in order to restore
the login prompt and then start X.
I don’t know if this bug may be related to yours: in any case I would try to
boot in runlevel 3 in order to see what happens.
All the best, 
Giorgio

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

--- Comment #8 from Giorgio (giorgio.colacchio@gmail.com) ---
Hi Elmar,
I don’t know if it may be of help, anyway I have a similar problem: the point
is that my problem does not seem related to graphic drivers. My OS is
Slackware64 14.2, kernel 4.17.0. At boot, after the usual kernel messages, this
is what I see, at the end, on the screen (please, note that I boot in non
graphical mode, that is in init 3):

Welcome to Linux 4.17.0 (tty1)

darkstar login: [   15.869206] wlan0: authenticate with 64:59:f8:cd:3a:88
[   15.887504] wlan0: send auth to 64:59:f8:cd:3a:88 (try 1/3)
[   15.892825] wlan0: authenticated
[   15.895108] wlan0: associate with 64:59:f8:cd:3a:88 (try 1/3)
[   15.899592] wlan0: RX AssocResp from 64:59:f8:cd:3a:88 (capab=0x411 status=0
aid=3)
[   15.900872] wlan0: associated

as you can see, after the welcome message I can’t insert my login username – 
because of the extra messages related to wlan authentication/association –  and
as a consequence the system gets stuck.  However, (in my case) we are dealing
here with a “trivial” bug, since it suffices to press Enter in order to restore
the login prompt and then start X.
I don’t know if this bug may be related to yours: in any case I would try to
boot in runlevel 3 in order to see what happens.
All the best, 
Giorgio

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

--- Comment #9 from Elmar Stellnberger (estellnb@elstel.org) ---
No, I don´t see what your bug should have in common with mine, Giorgio. Mine
occurs after starting the X server.
Very annoying; this bug persists up to kernel 4.18.0-rc1+.

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

--- Comment #10 from Giorgio (giorgio.colacchio@gmail.com) ---
Hi Elmar,

sorry that I couldn't be of any help to you.....I hope that the the next
(kernel) incremental patches will fix the bug...

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

--- Comment #11 from Elmar Stellnberger (estellnb@elstel.org) ---
persists with 4.19.0-rc2+

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

--- Comment #12 from Ant (untaintableangel@hotmail.co.uk) ---
Elmar, did you have a look at my bug report from comment 4? 

Does installing something like rng-tools fix the problem? 

If it does, then you are suffering from the same, widespread, well-documented
issue that began with 4.17-rc2 with
commit43838a23a05fbd13e47d750d3dfd77001536dd33 (random: fix crng_ready() test).

The kernel is waiting for enough entropy to have been generated and it causes a
long hang until you mash on random keys or something else helps generate it.
Until then, you get a nice black screen.
Unfortunately, this has the side effect of slightly lengthening the shutdown
and restart time by a few seconds, but the boot/login time is returned to
normal. 

I used to have an ath9k based wireless card and there is an option in the
kernel to use it to help add to the entropy pool. This solved the problem
completely for me on my custom kernels, but then I went and got a new wireless
card that isn't so fortunate as to have this option in the kernel config and
I'm back to waiting for a more permanent fix too.

At least give it a try, it sounds like the same problem.

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

--- Comment #13 from Elmar Stellnberger (estellnb@elstel.org) ---
Unfortunately when I install rng-tools I get the following error message with
4.19.0-rc2+: Hardware RNG device inode not found. If I install rng-tools5 I get
no error message but booting does not speed up with rng-tools5 (same long
waiting). Concerning my wireless network card I have an iwlwifi card (Intel
Corporation Ultimate N WiFi Link 5300). However there seems to be no kernel
option in order to gather entropy with this card.

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[Bug 199619] screen stays dark for long on bootup since kernel 4.17.0-rc2+

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199619

--- Comment #14 from Elmar Stellnberger (estellnb@elstel.org) ---
It is the same with kernel 4.20.0-rc4+. Are there any plans to extend the
number of devices that can contribute to the entropy pool? f.i. I have an
accelerometer in my notebook which should contribute more and better entropy
than my mouse and keyboard.

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