Hang on splash logo while booting
Peter Flynn
peter at silmaril.ie
Wed Nov 8 22:35:19 UTC 2017
On 08/11/17 05:41, Ralf Mardorf wrote:
> Perhaps it was just a disk check and now it would boot with the splash
> screen, too.
Sadly not...it is at least consistently failing :-)
> On 08/11/17 07:30, Colin Law wrote:
[...]
> As Ralf suggests try again with splash. If that still doesn't work tell
> us what you did to stop the splash. Also boot again without splash and
> look in syslog to see what is there for the failed boot.
I haven't had time to look at syslog yet, and I'm away from the machine now.
A more accurate description:
1. Pressing Esc when the splash screen appears makes the display go
blank and nothing more happens. Pressing keys does nothing, and there
is no mouse cursor. Basically dead, although the lights are still on.
2. When it hangs, it can always be rebooted after power cycle using
Recovery Mode from the Grub menu. It asks for the disk crypt in text
mode, and continues to boot OK. Completing full boot from the menu
gets a normal graphical login and everything works.
3. Removing 'quiet splash' from the Grub boot line goes to text-mode
boot, but instead of the screen being a 24-line 80-char monochrome
TTY, the font is smaller and it's in colour, like with a colour
xterm. Boot goes on for 40 secs then hangs. As it's not
copy/pastable, I wrote it down:
> Reached target multi-user system
> [*] Started WPA Supplicant
> [40.1000001] Watchdog: BUG: soft lockup - CPU#7 stuck for 23s! [gpu-manager:933]
> [***] A start job is running for Detect the available GPUs and deal with any system changes (3 min 47s/no limit)
That last line gets repeated every few minutes. I understand what it
says, but it's obviously not able to report what the underlying problem
is. A stuck CPU is doubleplusungood. Then it spews out a little more:
> [242.652679] Tainted: G L 4.13-0-16-generic #19-Ubuntu
> echo 0 > /proc/sys/kernel/hung_task_timeout_secs disables this message
Then it goes back to A start job is running, and the whole thing cycles.
Hold down power for 5 secs and force halt. Reboot from Recovery, select
full reboot, and it's back in action. Normal shutdown, power off. Then
power up and it enters graphical boot, give the disk crypt, and the
Ubuntu logo white does start turning red until the third one, when it
hangs solid.
Once it was booted I looked at dmesg but there was nothing in there
about CPU#7 or any lockup, but that seems to have occurred after
runlevel 5 was reached. I then did a system upgrade from 17.04 to 17.10,
not something I normally do on my production systems, but in this case I
now regard the laptop as sacrificial. This upgrade has not changed the
behaviour, however: it still hangs in graphical boot as described.
It's of course possible that it is a hardware problem, I guess. But for
the first 2-3 days of use (new last week) it worked fine, being
installed with 17.04 without problems, and being shut down and rebooted
several times. Then this problem occurred suddenly and without any event
acting as warning.
///Peter
More information about the ubuntu-users
mailing list