I have a 2019 Thinkpad T480 and have been running Ubuntu 18.04 with very few issues for a while now.
After a recent update, it started acting strangely. It would take an unusually long time loading on the Ubuntu screen with the 5 cycling dots. Then when it finally reached the profile select screen, the mouse and keyboard wouldn't function for another 5 minutes. And then when I fianlly logged in, there would either be no internet (wifi adaptor not detected), no sound (only Dummy Output in sound devices), or both.
After some trial and error, I found out that it could be an issue with the current kernel, 4.15.0-177-generic. Using the GRUB menu to roll it back to 4.15.0-176 seemed to solve my issues. So I tried to set that as the default kernel by editing
Now when I start my machine, it shows the Lenovo logo, then a purple screen, then all the lights go out including power, then it shows the Lenovo logo again, and then it says "Entering setup..." and then goes to the BIOS boot menu. From there, I don't know how to get back to the GUI (or if I can). Restarting from the BIOS menu just cycles the same process over again. The only way to turn off the laptop that I can find is a hard reset by holding the power button.
Any suggestions for what to do would be greatly appreciated. I am still new to this, so please ask for clarificationof I'm not explaining this well!
After a recent update, it started acting strangely. It would take an unusually long time loading on the Ubuntu screen with the 5 cycling dots. Then when it finally reached the profile select screen, the mouse and keyboard wouldn't function for another 5 minutes. And then when I fianlly logged in, there would either be no internet (wifi adaptor not detected), no sound (only Dummy Output in sound devices), or both.
After some trial and error, I found out that it could be an issue with the current kernel, 4.15.0-177-generic. Using the GRUB menu to roll it back to 4.15.0-176 seemed to solve my issues. So I tried to set that as the default kernel by editing
GRUB_DEFAULT=0
to say GRUB_DEFAULT=2
in /etc/default/grub (because 2 was the index of the kernel version I needed) and that's when the real problems started.Now when I start my machine, it shows the Lenovo logo, then a purple screen, then all the lights go out including power, then it shows the Lenovo logo again, and then it says "Entering setup..." and then goes to the BIOS boot menu. From there, I don't know how to get back to the GUI (or if I can). Restarting from the BIOS menu just cycles the same process over again. The only way to turn off the laptop that I can find is a hard reset by holding the power button.
Any suggestions for what to do would be greatly appreciated. I am still new to this, so please ask for clarificationof I'm not explaining this well!