[lite noob]

Kernel: 4.15.0-38-generic x86_64
Hardware: Dell latitude 7270
OS: Linux Lite 4.2

I've had this problem with my current distro of Linux Lite 4.2 and with a prior distro of Linux Mint 18.3 Sylvia. When I connect my HDMI cable to my TV, it's not detected by the computer. Then I learned that you have to boot with the HDMI cable already plugged in. I do see the DELL logo while in the POST, but after that the image on the TV fades and it goes back to my laptop and shows me the log in screen. After logging in, the computer doesn't detect the TV. I'm even able to see GRUB on the TV if I access it. But when it tries to load the Linux OS, the image switches from displaying on the TV to the laptop screen.

Also tried booting from other live distros, with no luck.

I've read on other forums that I have to switch between some nVidia video drivers, but I don't think that applies to my configuration because my video card is from Intel, and the BIOS has no video settings I can play with to switch drivers.

On [url=http://"https://askubuntu.com/questions/927639/external-monitor-hdmi-does-not-work-with-intel-hd5500-ubuntu-16-04"]this thread[/url] it was suggested to update to kernel 4.15.18-041518-generic, which didn't work for me.

Code:

$sudo lshw -c video   *-display                      description: VGA compatible controller       product: HD Graphics 520       vendor: Intel Corporation       physical id: 2       bus info: pci@0000:00:02.0       version: 07       width: 64 bits       clock: 33MHz       capabilities: pciexpress msi pm vga_controller bus_master cap_list rom       configuration: driver=i915 latency=0       resources: irq:128 memory:e0000000-e0ffffff memory:d0000000-dfffffff ioport:f000(size=64) memory:c0000-dffff

Code:

$xrandar Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192 eDP-1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 277mm x 156mm   1366x768      60.00*+  47.49    1360x768      59.80    59.96    1280x720      60.00    59.99    59.86    59.74    1024x768      60.04    60.00    960x720      60.00    928x696      60.05    896x672      60.01    1024x576      59.95    59.96    59.90    59.82    960x600      59.93    60.00    960x540      59.96    59.99    59.63    59.82    800x600      60.00    60.32    56.25    840x525      60.01    59.88    864x486      59.92    59.57    800x512      60.17    700x525      59.98    800x450      59.95    59.82    640x512      60.02    720x450      59.89    700x450      59.96    59.88    640x480      60.00    59.94    720x405      59.51    58.99    684x384      59.88    59.85    680x384      59.80    59.96    640x400      59.88    59.98    576x432      60.06    640x360      59.86    59.83    59.84    59.32    512x384      60.00    512x288      60.00    59.92    480x270      59.63    59.82    400x300      60.32    56.34    432x243      59.92    59.57    320x240      60.05    360x202      59.51    59.13    320x180      59.84    59.32  HDMI-1 disconnected (normal left inverted right x axis y axis) DP-1 disconnected (normal left inverted right x axis y axis) HDMI-2 disconnected (normal left inverted right x axis y axis)

Code:

$lspci -k -s 00:02.0 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07)   Subsystem: Dell Skylake GT2 [HD Graphics 520]   Kernel driver in use: i915   Kernel modules: i915

Question #1: How can I get the external HDMI port to work?

Question #2: Is it true that you HAVE to connect the HDMI cable to your computer BEFORE booting the Linux distro?

Thanks

[PRafael]

Good mornig.

My hardware is diferente (I use a Toshiba) and I can see the HDMI display without problems. Just to ask...have you switch monitors usin FN + F Key (I don't know the Dell key to execute this...on my Toshiba is F3) so I press FN+F3 tho have the HDMI image. See your manual to select the right FN Key.

About the cable...the computer detect the HDMI entry even if a plug the cable after booting the computer...just using the FN + F Key combination.

Regards

Paulo

[firenice03]

Have you checked "display" to enable the monitor/tv (display 2) and either extend/duplicate/present to the display??

[lite noob]

[member=7893]PRafael[/member] Yes. In my computer, It's Fn + F8 to switch the display. This brings the "Display" window, which is what [member=5414]firenice03[/member] is talking about. And the only option there is "Laptop".

Any more suggestions?

[valtam]

Try this PPA here:

Code:

sudo add-apt-repository ppa:oibaf/graphics-drivers sudo apt-get update sudo apt-get dist-upgrade

Reboot.

[lite noob]

Try this PPA here:

Code:

sudo add-apt-repository ppa:oibaf/graphics-drivers sudo apt-get update sudo apt-get dist-upgrade

Reboot.

Thanks, but that didn't work out. Is there a way I can check that those drivers are the ones my system is using? My lspci -k -s 00:02.0 command is still reading I have the i915 driver even after adding that ppa and upgrading it.

Also, I tried out with a newer TV, which actually worked fine. Back when my laptop had Windows on it, I was able to duplicate and extend the screen with my "old" (non-working) TV. So this has to be something with the drivers.