Hardware: Lenovo T420 with Nvidia NVS4200m
Issue 1: When using an external monitor (Full-HD) I may set the resolution of the external monitor via Settings -> Display (don't know the exact spelling as I use german language) and deactivate the internal monitor of the notebook and everything is fine for about a minute. Then the monitor settings are changed automatically to the previous setup. And if I do nothing - the settings flip back after additional amount of time. (WTF!)
I actually use X.org free drivers for the NVIDIA GPU. I tried the latest stable NVIDIA drivers (nvidia-364) without success.
I guess it has got something to do with the hybrid graphics solution Intel/Nvidia...
/var/log/Xorg.0.log basically shows:
[133.422] (II) intel(0): resizing framebuffer to 1440x900
[ 133.423] (II) intel(0): switch to mode 1440x900@59.9 on LVDS2 using pipe 0, position (0, 0), rotation normal, reflection none
[ 134.032] resize called 1440 900
[ 134.199] (II) NOUVEAU(G0): EDID vendor "AOC", prod id 9065
[ 134.200] (II) NOUVEAU(G0): Using hsync ranges from config file
[ 134.200] (II) NOUVEAU(G0): Using vrefresh ranges from config file
[ 134.200] (II) NOUVEAU(G0): Printing DDC gathered Modelines:
[ 134.200] (II) NOUVEAU(G0): Modeline "1920x1080"x0.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[ 134.200] (II) NOUVEAU(G0): Modeline "720x480"x0.0 27.00 720 736 798 858 480 489 495 525 -hsync -vsync (31.5 kHz e)
[ 134.200] (II) NOUVEAU(G0): Modeline "1280x720"x0.0 74.25 1280 1390 1430 1650 720 725 730 750 +hsync +vsync (45.0 kHz e)
... etc
When deactivating internal monitor and changing settings furthermore the settings are kept until reboot or suspend.
Issue 2: How can the external monitor be configured to power off after some minutes? The settings under "Screen" are without effect for external monitor.
Anyone any ideas to fix that?
