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Old 08-05-2018, 11:25 AM   #1
Obed Fuentes
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Smile My PC does not detect external monitor


Hi, after installing Ubuntu 18.04 on my Toshiba Satellite L15W-B1208X, it does not detect my external monitor by HDMI port.

The PC has a Intel (R) HD Graphics, my desktop resolution is 1366 x 768

Please help!

Thanks.
 
Old 08-05-2018, 08:12 PM   #2
flshope
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Hello, Obed Fuentes. Welcome to LQ.

I have not yet upgraded my Ubuntu 16.04 to 18.04 on my primary desktop machine, so I don't know what all might be different in 18.04. But have you looked at System Settings/Displays? You might have to activate your external display there.

I have a small HP notebook running Ubuntu. To bring up an external display, I must hit one of the function keys, which is explained in the HP user manual and probably unique to the HP. If you have not done so, you might check the manual for your Toshiba.
 
Old 08-05-2018, 09:50 PM   #3
frankbell
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Generally, in my experience at least, the monitor needs to be plugged into the computer when you log in for the computer to see it.

This is a shot in the dark, but many laptops have a function key for switching monitors. My Zareason has a function key with a little blue picture that's intended to represent a monitor screen. When I connect to an external monitor, I have to hold the blue Fn key and press that function key to cycle through my monitor choices (they include cloned screens, separate screens, external external screen only, then back to internal only).
 
Old 08-06-2018, 12:40 AM   #4
AwesomeMachine
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One thing that may be helpful is to know whether Linux recognizes the HDMI port. Try running 'xrandr' and have a look at the output.
 
Old 08-06-2018, 03:10 AM   #5
mrmazda
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Quote:
Originally Posted by frankbell View Post
Generally, in my experience at least, the monitor needs to be plugged into the computer when you log in for the computer to see it.
In recent releases like 18.04, this should no longer be the case. IMRE, it doesn't with relatively recent PCIe cards and with multiple output Intel gfx on motherboard.

Windows 7 certainly has no such problem. My sister visits with her Mac laptop running Win7. She turns it on. I plug a display sitting just above and just behind laptop into its TBolt port using a TBolt to DVI adapter and the external lights up as an upward extension of her desktop, top of desktop icons on larger/upper screen, taskbar on bottom of laptop screen.
 
Old 08-09-2018, 10:55 AM   #6
Obed Fuentes
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Smile My PC does not detect external monitor

Hi, thanks you all for answer me and my apology for replying you late.

(1) The system settings simply does not show external monitor.

(2) Linux appears not to detect the monitor via HDMI port. This is the output: "HDMI-1 disconnected (normal left inverted right x axis y axis)"

Any help.

Once again, thank you all.
 
Old 08-11-2018, 03:18 AM   #7
ondoho
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op, output of

Code:
lspci -k | grep -iEA5 'vga|3d|display'
please use code tags for code, and show us the command itself + its complete outoput.
 
Old 08-11-2018, 03:53 AM   #8
mrmazda
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Quote:
Originally Posted by AwesomeMachine View Post
Try running 'xrandr' and have a look at the output.
Indeed, especially if the external "monitor" is a 1080p TV. Neither of my TVs support 1366x768, while both support 720p (1280x720). If the laptop supports 1280x720, you might try connecting the external after reconfiguring to use 1280x720 instead of 1366x768.

According to https://www.kernel.org/doc/Documentation/fb/modedb.txt the HDMI output can be forced on via kernel cmdline, e.g.:
Code:
video=LVDS-1:e video=HDMI-1:D
 
Old 08-16-2018, 05:17 PM   #9
Obed Fuentes
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Hi ondoho!

Thanks!

This is the output:

hector@hector-Satellite-L15W-B:~$ lspci -k | grep -iEA5 'vga|3d|display'
00:02.0 VGA compatible controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display (rev 0e)
Subsystem: Toshiba America Info Systems Atom Processor Z36xxx/Z37xxx Series Graphics & Display
Kernel driver in use: i915
Kernel modules: i915
00:13.0 SATA controller: Intel Corporation Atom Processor E3800 Series SATA AHCI Controller (rev 0e)
Subsystem: Toshiba America Info Systems Atom Processor E3800 Series SATA AHCI Controller
Kernel driver in use: ahci

I do not really know what that means.
 
Old 08-17-2018, 01:33 AM   #10
ondoho
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Quote:
Originally Posted by Obed Fuentes View Post
I do not really know what that means.
it shows us what graphics hardware you have and what drivers are assigned to it (and active).
this is the relevant bit (the rest is trailing rubbish from the grep command):
Code:
00:02.0 VGA compatible controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display (rev 0e)
Subsystem: Toshiba America Info Systems Atom Processor Z36xxx/Z37xxx Series Graphics & Display
Kernel driver in use: i915
Kernel modules: i915
everything seems in order there. the right driver, no fancy dual/hybrid grahics...
but some newer intel gpus require firmware to unlock all functionality, please research!

also please look closer at mrmazda's last post.

it is of course also possible that the problem is not inside your computer at all.

searching for this, i found this. you should take a closer look at the latter half of that thread.
 
Old 02-23-2019, 07:01 AM   #11
wxwok
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I resolved the problem by removing the file:/etc/X11/xorg.conf
 
Old 02-23-2019, 02:08 PM   #12
ondoho
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^ yes it is said that nowadays one rarely needs this anymore.
surely worth a try - if OP ever comes back.
 
  


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