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Laptop PC trouble after upgrade to Debian 9 (stretch), and solution

The last new year holidays was more than a month ago. it was a good chance to make a major version upgrade on my PC.
I upgraded my laptop PC from Debian 8 (Jessie) to Debian 9 (stretch).
During the upgrade, I did encountered several times, but no serious trouble.
I started to enjoy the lightdm login console showing up with the Debian 9 new theme.

But when I booted it without AC power supply, the boot sequence ended in strange way. The lightdm did not show up. Instead, a black screen remains with many error messages.

I searched for a hint in the log files in /var/log directory, and found that the root file system was mounted in read-only mode.
With this hit, I search for any hints around the world and found a similar problem in the bug database in http://bugs.debian.org/ It seemed to imply that laptop-mode-tools package was involved.

In order to test whether the laptop-mode-tools is involved in my case, I installed tlp package which conflicted with laptop-mode-tools.
With tlp instead of laptop-mode-tools, the strange boot problem resolved.

If you are in similar trouble booting Debian 9, I would like to suggest tlp package instead of laptop-mode-tools.

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