Hi all,
I've bought brand new M6700 as a replacement for my W500.
It's 3740 with 32GB RAm ,K4000M and IPS screen. I have noticed strange screen brightness behaviour:
How to recreate the problem:
1) Charge battery to full
2) Set (via bios, OS etc) minimum brightness for LCD for battery usage and maximum for AC power
just to see brighness difference in those two modes
3) Connect AC plug and observe.
Result ( inproper behaviour):
Screen reduces brightness for battery level and after few seconds becomes bright as for AC power randomly without unplugging the AC.
Sometime you have to wait 3 min to notice the issue, and after that 3-4 blinks goes one by one in a period of 1min.
It happens on Ubuntu 12.04LTS, factory installed Win8 and ... Bios itself ( when notebook runs biost testing procedures).
Linux shows that there AC plug has been disconected (but it's realy still in place and lighting) for a short period of time (acpi event):
/proc/acpi/event: ac_adapter AC 00000080 00000000 <- system dimm's
netlink: ac_adapter ACPI0003:00 00000080 00000000
/proc/acpi/event: battery BAT0 00000080 00000001
netlink: battery PNP0C0A:00 00000080 00000001
/proc/acpi/event: ac_adapter AC 00000080 00000001 <- back to AC brightness
netlink: ac_adapter ACPI0003:00 00000080 00000001
/proc/acpi/event: battery BAT0 00000080 00000001
netlink: battery PNP0C0A:00 00000080 0000000
Can somebody confirm same behaviour on the other M6700 ?
Or maybye there are some secret procedures implemented in bios to test battery (?) <- how to disable this "feature"
Or maybye it's just somebody forgot to implement something in bios ...
PM
PS. By the way : Is your M6700 hot at the bottom so much that it's hard to work
keepping it on thighs and do not risk egg's boiling :-) ?