Bug#922712: general: Freezing on log-in screen when booting laptop on battery power

[Repu <ostik0bleat@gmail.com>]

Package: general
Severity: important

"Hewlet"Hewlett Packard Pavilion g6 2239-sr reffered as "laptop" later
t Packard Pavilion g6 2239-sr reffered as "laptop" later

Dear Maintainer,
"Hewlett Packard Pavilion g6 2239-sr reffered as "laptop" later
after clean Debian stable install (with Xfce DE, but i assume it's not important as it has problems with most if not all DEs)
and instalation of "firmware-linux" metapackage and tlp

The outcome was that it rendered system unusable when booting on battery power, as it freezed
system on Log-in screen with slight graphical glitches appearing on screen like broken mouse cursor/pointer/arrow as a mess
of ASCII characters (not letters but symbols rather) and the part of input field(s) becomes a little bigger than another
making a slight aliasing effect

I expected everything to work correctly after installing firmware

Thanks for attention!

-- System Information:
Debian Release: 9.7
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-8-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)