--- Comment #13 from Gregory Lee Bartholomew <gregory.lee.bartholomew(a)gmail.com>
Not sure if this will be helpful to finding the common cause of these freezes,
but here is an excerpt from the #fedora IRC channel where another user reported
hard freezes in Fedora. He is using Fedora 30 though and he is running the
Cinnamon spin, not Gnome. It looks like he is also using the i915 driver:
T 1562769374 1sdgathman1> I have a T61 running Fedora 30 Cinnamon spin
fresh install, fully updated. On normal startup to GUI, it hangs in a hard CPU
loop (no dmesg, no nothing) shortly after starting lightdm.
T 1562769427 1sdgathman1> However, if I start up in mode 3, then do
"telinit 5", it works fine (after systemctl restart NetworkManager - which
stops working on switching modes).
T 1562769467 1sdgathman1> I don't even know what component to report the
T 1562769575 1sdgathman1> It also works if I add nomodeset to kernel cli,
booting directly to mode 5 with no system freeze. But then there is no video
acceleration, and cinnamon runs in software rendering mode, and videos require
2x the CPU.
T 1562769665 1sdgathman1> This system worked in F29.
T 1562769925 1sdgathman1> The T61 is from LiveCD fresh install.
T 1562770014 1dowdle1> sdgathman: For your laptop, I'd recommend trying a
different spin as Cinnamon wants accellerated 3D... although it is supposed to
switch to software rendering if it has trouble with it... but it would be
interesting to see how, say, XFCE works or not.
T 1562770034 1sdgathman1> I hangs before starting cinnamon.
T 1562770046 1sdgathman1> Only lightdm is running when it freezes.
T 1562770107 1dowdle1> sdgathman: Well, it is most likely one of the core
components like the kernel... or an xorg driver.
T 1562770133 1sdgathman1> All those are working fine - if they are
started in proper sequence.
T 1562771648 1sdgathman1> There is something that freezes the kernel if
it runs after starting lightdm
T 1562771900 2gregbartholome30 It is a pain, but you can also try "dnf
downgrade <package-name>" on whatever packages you suspect might have a new
to see if you can narrow down the problem.
T 1562771938 1sdgathma> gregbartholomew: all packages seem to be working great
- as long as they startup in the right sequence.
T 1562771963 1sdgathman1> Once system is up, video, wireless, and sound,
and all are quite stable.
T 1562772121 1sdgathman1> Unfortunately, unlike the Dell, it has never
worked with default boot sequence.
T 1562772167 1sdgathman1> It freezes system, cpu loop, keyboard dead,
about 3 secs after loading lightdm.
T 1562772181 1sdgathman1> bugs_: yes, it works when I do that
T 1562772195 1sdgathman1> Also works with "telinit 5" after multi
T 1562772210 1sdgathman1> So it is clearly a startup timing problem
T 1562772224 2gregbartholome30 Oh, it completely freezes the OS? Requiring a
hard power-cycle to restart?
T 1562772231 1sdgathma> gregbartholomew: yes
T 1562772247 1sdgathman1> And with CPUs and fan going full tilt
T 1562772372 2gregbartholome30 I am getting a hard os freeze on one of my home
systems as well, but in my case, it is triggered by a weird combination of
gnome plugins and key presses. I filed a bug report for it and I am waiting for
someone more talented than I to trace down the real problem.
T 1562772411 1sdgathman1> I can't tell what to file a bug report against.
T 1562772427 2gregbartholome30 I think anytime the keyboard/mouse stops
responding, the cursor stops blinking etc. it is a kernel-level bug.
T 1562772464 1sdgathman1> Ok, that's helpful
T 1562772509 1sdgathman1> I can see that as something starting about the
time it freezes...
T 1562772696 1sdgathman1> bugs_: again, cinnamon never runs
T 1562772707 1sdgathman1> the *only* gui running is lightdm
T 1562772866 1sdgathman1> Nope. Still freezes 3 secs after lightdm loads
T 1562772887 1sdgathman1> You can still switch console, start to login,
etc during that 3 secs...
T 1562772907 1sdgathman1> I can type over 100wpm, but still, that is
T 1562772918 2gregbartholome30 sdgathman: you narrowed it down to the video
card earlier for this system right?
T 1562772944 1sdgathma> gregbartholomew: no.
T 1562772970 2gregbartholome30 Did you say that nomodeset made this one work
or was that the other one?
T 1562772999 1sdgathman1> We tried using an xorg.conf, but that just made
me notice that it works if you don't start in mode 5.
T 1562773029 1sdgathma> gregbartholomew: nomodeset makes the system start
without freezing in mode 5 - but then there is no GPU accel.
T 1562773064 1sdgathman1> And when you start cinnamon, it then uses
T 1562773075 1sdgathman1> bugs_: local auth only
T 1562773130 2gregbartholome30 still, that might hint at where the problem
T 1562773131 1sdgathman1> Ah, I should try starting in single user mode
(is that still gotten by appending 's' ?)
T 1562773137 1sdgathman1> And then telinit 5
T 1562773155 1sdgathman1> That will bisect the problem
T 1562773172 1bugs_1> sdgathman have you ever had to put vmalloc=256M in your
T 1562773225 2gregbartholome30 maybe run lsmod to see which driver your video
card is using and then modinfo <modname> to see if it takes any parameters.
T 1562773290 1sdgathman1> starting in single user works fine, switching
to mode 5 from single user still freezes. So it is something that happens
between single user and graphics.
T 1562773303 1sdgathman1> But before mode 3.
T 1562773313 2gregbartholome30 it sounds like a problem with the video driver
T 1562773313 1sdgathman1> Because starting in 3 and going to 5 works.
T 1562773353 1sdgathman1> Since nomodeset "fixes" the startup freeze,
does seem like video driver.
T 1562773374 1sdgathman1> But since 3 -> 5 works, there shound be a work
T 1562773403 2gregbartholome30 it may just be initializing the video card in a
slightly different way when you do that sequence.
T 1562773434 2gregbartholome30 how about if you disable rhgb?
T 1562773596 1sdgathman1> removed rhgb and quiet - it worked going
directly to graphics
T 1562773617 2gregbartholome30 weird
T 1562773772 1sdgathman1> still freezes going directly to 5 with quiet,
but not rhgb
T 1562773858 1sdgathman1> Well, it is stable with both rhgb and quiet
T 1562773905 1sdgathman1> This is a new linux user, and seeing startup
messages is part of the look and feel. :-)
T 1562773931 1sdgathman1> It is actually helpful when something goes
wrong: "What's the last line on the screen?"
T 1562773946 2gregbartholome30 maybe file a bug report against the video
T 1562773973 1sdgathman1> That would be the xorg-x11-drv-intel ?
T 1562774380 1sdgathman1> I spoke too soon. Went to pee, and when I came
back T61 was frozen. It just takes more than 3 secsc now.
T 1562774396 1sdgathman1> But booting to mode 3 first still works...
T 1562774539 1sdgathman1> bugs_: takes 5 secs to freeze without quiet...
T 1562774556 1sdgathman1> So it does change the timing
T 1562774583 1sdgathman1> Still not long enough to switch console and
grab a systemd-analyze ...
T 1562774608 2gregbartholome30 sdgathman: it sounds like a pretty low-level
driver/firmware problem in any case. about all you can do is look for firmware
updates and try fiddling with some driver parameters (if it takes any).
T 1562774652 1sdgathman1> ok
T 1562774764 1sdgathman1> Still freezes 5 sec after starting lightdm
T 1562775099 1sdgathman1> There is no i915.conf in /etc/modprobe.d
T 1562775153 1sdgathman1> Does that turn off accel ?
T 1562775175 1sdgathman1> So makes cinnamon slow
T 1562775247 1sdgathman1> The accel is working fine once startup is
finished. At this point, I am trying to automate the delay introduced by
starting in mode 3 first.
T 1562775528 1sdgathman1> Is there another DM to try?
T 1562775640 1sdgathman1> lightdm already runs After=rc-local.service
T 1562776600 1sdgathman1> bugs_: switched to lxdm - and it worked!
T 1562776606 1sdgathman1> rebooting again just to make sure ...
T 1562776711 1sdgathman1> didn't work that time - froze
T 1562776940 1sdgathman1> Did it again, pressed escape to display startup
messages, and didn't try to login until disk stopped blinking - worked.
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