Sometimes in noticed that HD4400 in E7440 (with i7 4600U¨) is frozen on 200MHz (this is absolute unusual frequncy : base frequncy is 600MHz for this one), regardless the (graphic)load, power profile. I also tried removing AC/DC cable. Note I noticed that condition while the notebook was charging( with 65watt Dell adapter, but the shipped is 45W) . I also played with th Dell Commande | Power - changed thermal management - changed all four modes (Cool,Quiet,Balanced,Ultra performance) Tried also suspend&resume.
But in some moments (30s) the GPU unlocked and was able to react according to load (600 OR 900 MHz), but i didn't observe cause.
It is serious problem, becaouse the graphic performance is poor in this condition.
Another symptoms:
-throttlestop shows permanently TDP Throttle icon, regardless power draw (2W..15W - no change)
-CPU cannot fully utilize turbo(3.3GHz) - only utilizes 2.7GHz(turbo starting freq.) on the TDP Level 2 and 2.1GHz (base freq). on TDP control 0 or 1 (I dont remember now).
Questions:
Does the charging cause this problem? (I suspect E7440 thanks to Haswell-ULT is "frugal" platform compared to standard mobile or quadcore)
Does the Power - Thermal management settings caused the freq. to lockup?
PS: Does the Balanced (in dell tool )setting represent the former "Standard" option in the windows power manager- edit - Dell Enhanced Settings - Thermal Mode (Standard,Ultra performance, Cool, Quiet)
