r/LinuxOnThinkpad • u/tloszabno member • 3d ago

T480 has trouble waking up when docked with 2 external monitors

Hey everyone!

I'm the proud owner of a ThinkPad T480 (i7, Intel GPU, 32 GB RAM).

I use it mostly in docked mode, with the lid closed and two external monitors connected via USB-C. Sometimes I unplug it and use it as a standalone laptop.

I'm having a really annoying issue with waking it up when the monitors are connected.

About 2 out of 3 times, when I open the lid or press the power button, nothing happens. The laptop doesn't wake up.

The only workaround I've found is:

  1. Unplug both monitors.
  2. Open the lid.
  3. The laptop wakes up normally.
  4. Connect the monitors again.

However, after reconnecting them, I often have display detection problems as well. Sometimes only one monitor works. Sometimes xrandr still shows the internal display as connected even though the lid is closed.

I've tested this on several Linux distributions, including:

  • Fedora 44
  • Debian Testing
  • Debian Stable
  • Linux Mint
  • currently Xubuntu 26.04

I also have exactly the same problem on Windows 11, so I don't think this is purely a Linux/X11 issue.

Some other details:

  • Lid close action is configured to do nothing in Linux.
  • BIOS/firmware is fully updated.
  • Intel integrated graphics only.
  • Two external monitors connected through USB-C.

Has anyone experienced something similar with a T480?

I'm wondering if this could be related to the USB-C ports, Thunderbolt firmware, the dock/USB-C DisplayPort connection, or something specific to the T480.

Any ideas on how I could diagnose this further would be greatly appreciated!

1 Upvotes

100% Upvoted

4 comments sorted by

1

u/lic2smart member 2d ago

Yeah, that's a linux bug, disable the sleep option. It's even a bigger issue when you have double boot as it might reboot as windows.

1

u/tloszabno member 1d ago

But I constantly use sleep 😑 I did not have dual boot, in the times I used windows it was standalone and problem also occured 

1

u/lic2smart member 1d ago

Did you already update the bios? T480's have a bug that might brick your laptop, but I don't remember exactly how it works, I was told to update the bios when I bought mine. If you had this issue with Windows too that might also solve it with a bios update, but again linux has that issue, I have had it happen with my desktop and laptop so I just disable sleep as soon as I do a fresh install.