Comment 20 for bug 1726930

Okay. Thanks for the reports. It could very well be the flakiness in usb
devices that are causing this problem. Anyways, the best fix for this is to
contain usb execution to the runtime module only.

Note to self: per module activation was reported to not activating general
power savings. Check those before any conclusions

s3nt fr0m a $martph0ne, excuse typ0s

On 11-Jan-2018 15:56, "Douw Steyn" <email address hidden> wrote:

> Works for me too with Ubuntu 17.10 on an Acer Extensa laptop (i5-6200U
> SkyLake). Same symptoms but changing 'force' to 'auto' as above results
> in successful booting from battery.
>
> --
> You received this bug notification because you are subscribed to laptop-
> mode-tools in Ubuntu.
> https://bugs.launchpad.net/bugs/1726930
>
> Title:
> System fails to start (boot) on battery due to read-only root file-
> system
>
> Status in laptop-mode-tools package in Ubuntu:
> Confirmed
> Status in systemd package in Ubuntu:
> Confirmed
> Status in systemd package in Debian:
> Fix Released
>
> Bug description:
> This report is to capture the extended diagnostic efforts done on IRC
> #ubuntu for user maszlo, who has a Lenovo T450 with SSD that was
> upgraded from 17.04 to 17.10 and since fails to complete start-up of
> services when powered on battery.
>
> We'd previously applied the "acpi=os=! 'acpi_osi=Windows 2015'"
> workaround in case this was an ACPI DSDT issue.
>
> This appears to be due to a read-only root file-system. What is not
> clear is how the rootfs goes read-only.
>
> The file-system (sda6, ext4) is fsck-ed successfully in the initrd
> according to the /run/initramfs/fsck.log.
>
> From the start-up logs (with "systemd.log_level=debug") we see the
> ext4 driver report a remount operation not once but five times.
>
> $ grep 'EXT4-fs.*sda6' systemd-debug.log
> Oct 23 18:10:44 T450s kernel: EXT4-fs (sda6): mounted filesystem with
> ordered data mode. Opts: (null)
> Oct 23 18:10:44 T450s kernel: EXT4-fs (sda6): re-mounted. Opts:
> errors=remount-ro
> Oct 23 18:10:46 T450s kernel: EXT4-fs (sda6): re-mounted. Opts:
> errors=remount-ro,data=ordered,commit=600
> Oct 23 18:10:47 T450s kernel: EXT4-fs (sda6): re-mounted. Opts:
> errors=remount-ro,data=ordered,commit=600
> Oct 23 18:10:48 T450s kernel: EXT4-fs (sda6): re-mounted. Opts:
> errors=remount-ro,data=ordered,commit=600
> Oct 23 18:10:48 T450s kernel: EXT4-fs (sda6): re-mounted. Opts:
> errors=remount-ro,data=ordered,commit=600
> Oct 23 18:10:49 T450s kernel: EXT4-fs (sda6): re-mounted. Opts:
> errors=remount-ro,data=ordered,commit=600
>
> Those last five appear to be carrying options generated by laptop-
> mode-tools.
>
> User has disabled laptop-mode.service and laptop-mode.timer, and lmt-
> poll.service, but the issue remains.
>
> We see several reports of "read-only file-system":
>
> $ grep 'Read-only' systemd-debug.log
> Oct 23 18:10:46 T450s grub-common[1792]: grub-editenv: error: cannot
> open `/boot/grub/grubenv': Read-only file system.
> Oct 23 18:10:46 T450s systemd[1]: colord.service: Failed to run 'start'
> task: Read-only file system
> Oct 23 18:10:46 T450s gpu-manager[1797]: Warning: writing to
> /var/log/gpu-manager.log failed (Read-only file system)
> Oct 23 18:10:46 T450s systemd[1]: systemd-resolved.service: Failed to
> run 'start' task: Read-only file system
> Oct 23 18:10:46 T450s systemd[1]: systemd-resolved.service: Failed to
> run 'start' task: Read-only file system
> Oct 23 18:10:46 T450s gdm3[1932]: Failed to create LogDir /var/log/gdm3:
> Read-only file system
> ...
> Oct 23 18:11:26 T450s cupsd[1461]: Unable to change ownership of
> "/var/log/cups" - Read-only file system
> Oct 23 18:11:26 T450s cupsd[1461]: Unable to open log file
> "/var/log/cups/access_log" - Read-only file system
> Oct 23 18:12:52 T450s login[9248]: pam_lastlog(login:session): unable to
> open /var/log/lastlog: Read-only file system
>
> We also see several problems with systemd's connection to Dbus:
>
> $ grep 'Transport endpoint' systemd-debug.log
> Oct 23 18:10:46 T450s systemd[1]: Failed to send job change signal for
> 773: Transport endpoint is not connected
> Oct 23 18:10:46 T450s systemd[1]: systemd-logind.service: Failed to send
> unit change signal for systemd-logind.service: Transport endpoint is not
> connected
> Oct 23 18:10:46 T450s systemd[1]: Failed to send job remove signal for
> 156: Transport endpoint is not connected
> Oct 23 18:10:46 T450s systemd[1]: lmt-poll.service: Failed to send unit
> change signal for lmt-poll.service: Transport endpoint is not connected
> Oct 23 18:10:46 T450s systemd[1]: Failed to send job remove signal for
> 182: Transport endpoint is not connected
> Oct 23 18:10:46 T450s systemd[1]: Failed to send job remove signal for
> 95: Transport endpoint is not connected
> Oct 23 18:10:46 T450s systemd[1]: polkit.service: Failed to send unit
> change signal for polkit.service: Transport endpoint is not connected
> Oct 23 18:10:46 T450s systemd[1]: cups-browsed.service: Failed to send
> unit change signal for cups-browsed.service: Transport endpoint is not
> connected
> Oct 23 18:10:46 T450s systemd[1]: Failed to send job change signal for
> 773: Transport endpoint is not connected
> Oct 23 18:10:46 T450s systemd[1]: Failed to send job remove signal for
> 161: Transport endpoint is not connected
> Oct 23 18:10:46 T450s systemd[1]: gdomap.service: Failed to send unit
> change signal for gdomap.service: Transport endpoint is not connected
>
> When the user purged laptop-mode-tools the system starts successfully
> on battery.
>
> The user installed a fresh instance of 17.10 on a 2nd M2 SSD. When
> laptop-mode-tools was added to that instance it also exhibited the
> failure.
>
> # apt-cache rdepends laptop-mode-tools
> laptop-mode-tools
> Reverse Depends:
> systemd
> tlp
> powertop-1.13
> powertop
>
> # apt show systemd | grep Breaks
> Breaks: apparmor (<< 2.9.2-1), ifupdown (<< 0.8.5~), laptop-mode-tools
> (<< 1.68~), systemd-shim (<< 10-3~), udev (<< 228-5)
>
> # apt-cache policy laptop-mode-tools
> laptop-mode-tools:
> Installed: (none)
> Candidate: 1.71-2ubuntu1
>
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