I've been having this strange problem with my dual monitor setup.
While I've figured out the nightmare of auto-detect not working at all
with dual monitors and the inability to use nvidia's configure tool
combined with Plasma's monitor option to fix the problem I've switched
to nouveau and at least it is consistent now and not messing up my
windows and randomly disconnecting.
However, I still have one problem which is getting annoying. DPMS does
not work automatically like it should. It says for the monitors the
capabilities are off. But then it enables it (but it doesn't - xset
shows everything disabled - first two lines are monitors and the last
one is a general message saying it's enabled.)
$ grep -i dpms /var/log/Xorg.0.log
[ 6.087] (II) modeset(0): DPMS capabilities: Off
[ 6.156] (II) modeset(0): DPMS capabilities: Off
[ 6.174] (==) modeset(0): DPMS enabled
[ 6.174] (II) Initializing extension DPMS
Now I can run xset dpms 300 450 600 and only then xset shows it as set:
$ xset q
Keyboard Control:
auto repeat: on key click percent: 0 LED mask: 00000002
XKB indicators:
00: Caps Lock: off 01: Num Lock: on 02: Scroll Lock: off
03: Compose: off 04: Kana: off 05: Sleep: off
06: Suspend: off 07: Mute: off 08: Misc: off
09: Mail: off 10: Charging: off 11: Shift Lock: off
12: Group 2: off 13: Mouse Keys: off
auto repeat delay: 600 repeat rate: 25
auto repeating keys: 00ffffffdffffbbf
fadfffefffedffff
9fffffffffffffff
fff7ffffffffffff
bell percent: 50 bell pitch: 400 bell duration: 100
Pointer Control:
acceleration: 2/1 threshold: 4
Screen Saver:
prefer blanking: yes allow exposures: yes
timeout: 0 cycle: 600
Colors:
default colormap: 0x20 BlackPixel: 0x0 WhitePixel: 0xffffff
Font Path:
/usr/share/fonts/misc,/usr/share/fonts/75dpi,built-ins
DPMS (Display Power Management Signaling):
Standby: 300 Suspend: 450 Off: 600
DPMS is Enabled
Monitor is On
However, while it does blank and turn off the screens it doesn't last.
Maybe 10 seconds later the screens turn back on.
I can force it with xset to turn the monitors off immediately but same
results - after a short time the monitors turn back on. In the X logs
there is this:
[ 449.529] (WW) EDID timing clock 408.29 exceeds claimed max 75MHz, fixing
which makes me wonder if the EDID data is bad on the one monitor (a
Samsung monitor.)
Does anyone know of a way to test this DPMS? I suppose I could try
unplugging the Samsung monitor to see if the problem goes away? One
thing that may make a difference is that the Samsung is HDMI and the
other monitor (MSI) is DP.
However, both of these monitors worked find on my old computer (it was
really old, no UEFI support.
Can anyone think of next steps? I'm running out of things to try...
Dan
