Projector not detected (Thinkpad T460s - mini display port - VGA)

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antonicc
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Projector not detected (Thinkpad T460s - mini display port - VGA)

Post by antonicc » Sun Sep 08, 2019 10:54 am

Hi,
I try to connect to a projector, but it is not recognized by the system (Mint 19.2 Tina, Cinnamon 4.2.4).

I connect my laptop (Lenovo Thinkpad T460s) to the projector via a dongle from mini display port to VGA. Using Windows 10, the projector is recognized flawless, so I assume it is not a hardware or connection issue, but a software one.

The system setting Display is not giving any hint of the projector nor does xrandr in the terminal (see attached screenshots). I cannot switch to an HDMI connection but have to use the VGA one.

How can I force linux mint to connect to the projector?

Thanks a lot for your help!

Best,
Antonius


Code: Select all

 
 
inxi -Fxz

System:    Host: antonius-ThinkPad-T460s Kernel: 4.15.0-60-generic x86_64 bits: 64 compiler: gcc v: 7.4.0 
           Desktop: Cinnamon 4.2.4 Distro: Linux Mint 19.2 Tina base: Ubuntu 18.04 bionic 
Machine:   Type: Laptop System: LENOVO product: XXX v: ThinkPad T460s serial: <filter> 
           Mobo: LENOVO model: XXX v: XXX WIN serial: <filter> UEFI: LENOVO 
           v: N1CET77W (1.45 ) date: 08/06/2019 
Battery:   ID-1: BAT0 charge: 1.2 Wh condition: 17.1/23.5 Wh (73%) model: SANYO 00HW022 
           status: Discharging 
           ID-2: BAT1 charge: 17.4 Wh condition: 17.4/26.3 Wh (66%) model: SANYO 01AV405 status: Full 
CPU:       Topology: Dual Core model: Intel Core i5-6300U bits: 64 type: MT MCP arch: Skylake rev: 3 
           L2 cache: 3072 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 19968 
           Speed: 800 MHz min/max: 400/3000 MHz Core speeds (MHz): 1: 800 2: 799 3: 800 4: 800 
Graphics:  Device-1: Intel Skylake GT2 [HD Graphics 520] vendor: Lenovo driver: i915 v: kernel 
           bus ID: 00:02.0 
           Display: x11 server: X.Org 1.19.6 driver: modesetting unloaded: fbdev,vesa tty: N/A 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 520 (Skylake GT2) v: 4.5 Mesa 19.0.2 
           direct render: Yes 
Audio:     Device-1: Intel Sunrise Point-LP HD Audio vendor: Lenovo driver: snd_hda_intel v: kernel 
           bus ID: 00:1f.3 
           Sound Server: ALSA v: k4.15.0-60-generic 
Network:   Device-1: Intel Ethernet I219-LM vendor: Lenovo driver: e1000e v: 3.2.6-k port: efa0 
           bus ID: 00:1f.6 
           IF: enp0s31f6 state: down mac: <filter> 
           Device-2: Intel Wireless 8260 driver: iwlwifi v: kernel port: efa0 bus ID: 04:00.0 
           IF: wlp4s0 state: up mac: <filter> 
Drives:    Local Storage: total: 238.47 GiB used: 139.79 GiB (58.6%) 
           ID-1: /dev/sda vendor: Toshiba model: THNSFJ256GDNU A size: 238.47 GiB 
Partition: ID-1: / size: 160.49 GiB used: 139.75 GiB (87.1%) fs: ext4 dev: /dev/sda5 
Sensors:   System Temperatures: cpu: 46.0 C mobo: N/A 
           Fan Speeds (RPM): cpu: 0 
Info:      Processes: 237 Uptime: 2d 12m Memory: 7.65 GiB used: 4.82 GiB (63.0%) Init: systemd runlevel: 5 
           Compilers: gcc: 7.4.0 Shell: bash v: 4.4.19 inxi: 3.0.32 
Attachments
xrandr output
xrandr output
display settings
display settings

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roblm
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Re: Projector not detected (Thinkpad T460s - mini display port - VGA)

Post by roblm » Sun Sep 08, 2019 11:45 am

Use this command and post the output: ls /sys/class/drm

antonicc
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Re: Projector not detected (Thinkpad T460s - mini display port - VGA)

Post by antonicc » Sun Sep 08, 2019 5:57 pm

Code: Select all

ls /sys/class/drm
card0  card0-DP-1  card0-DP-2  card0-eDP-1  card0-HDMI-A-1  card0-HDMI-A-2  renderD128  version
thanks!

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roblm
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Re: Projector not detected (Thinkpad T460s - mini display port - VGA)

Post by roblm » Sun Sep 08, 2019 7:14 pm

You can test kernel parameters by editing the kernel command line. The effect will only last for one session. At the GRUB boot menu select the correct line but don’t press Enter. Press the “E” key to edit. If no menu shows, then hold down the shift key while starting. Use the Down arrow key to go down to the line that starts with:
linux /boot/vmlinuz.............ro quiet splash $vt_handoff

Go to the end of the line. Add a space and type this parameter: video=DP-1:e

Press F10 to start your system. If that doesn’t help, then repeat the process with the parameter below: video=DP-2:e

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