Hello,
I'm using KDE 4, each time I plug in my VGA cable, KDE detects the display but the external monitor itself won't detect anything. Meanwhile, HDMI works

No reply???

Because you posted it in the wrong forum, moving topic

> but the external monitor itself won't detect anything
What does that mean?
Monitors are a dumb piece of tech - they cannot detect things

I would say, no signal is sent to the monitor

Ahhh - "No Signal detected"

Please post the output of "xrandr -q" in this condition.

Notice that there *is* a known regression in recent software stacks affecting the VGA crtc.
It's not entirely clear what's wrong, but it seems the signal is underclocked and depending on the outputs capabilities, this results in squeezed, stripy or no output at all.
It happens with the nvidia blob > 352.xxx for sure, but there're claims also other GPUs are affected (what could point a bug in the kernel or X11)
This bug is not related to KDE (it affects me and I tested a plain X11 w/o any WM or DE)

Posted this on 10th Feb. and I'm not with the monitor anymore, but anytime I get close to it again, I will

Hi,
Here again with the monitor, here is the output of `xrandr -q`

Code: Select all

Screen 0: minimum 8 x 8, current 3647 x 1504, maximum 32767 x 32767
eDP1 connected primary 1366x768+0+736 (normal left inverted right x axis y axis) 344mm x 193mm
   1366x768      60.02*+
   1360x768      59.80    59.96
   1280x720      60.00
   1024x768      60.00
   1024x576      60.00
   960x540       60.00
   800x600       60.32    56.25
   864x486       60.00
   640x480       59.94
   720x405       60.00
   680x384       60.00
   640x360       60.00
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VGA1 connected 1024x768+2623+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768      60.00*
   800x600       60.32    56.25
   848x480       60.00
   640x480       59.94
VIRTUAL1 disconnected (normal left inverted right x axis y axis)


Its HP 2011x
Thanks

I'm thinking its from my PC because I've tested this with GNOME and Windows 10 and same thing happens... OS detects it but no signal is received by monitor. But other monitor models work for me

Have you tried the monitor anywhere else?
It's detected and -likely- feeded, but if it doesn't receive a signal on even windows, either the panel itself or the VGA cable (replacable?) seems to be broken.

Yes, the monitor shows up in HP laptop. Panel broken? I can use other monitors, just his one

The panel is likely ok (it tells you there's no signal) - what rather might be broken is either of the VGA plugs (the pins broke quite easily) or the cable itself, so I'd inspect all 4 plugs and try another VGA cable (if it's not hard-wired to the monitor...)

Okay, will keep troubleshooting.

Thanks