xuq01's questions

So, I've been experiencing this issue lately. I'm on Ubuntu 18.04, GDM/Gnome, default Ubuntu desktop. My graphics driver is nvidia-390 from the graphics-drivers PPA. My graphics card is a GeForce GTX 960M.

There have been two incidents where my display freezes and I'm unable to get into a TTY, so I shut down and restart by power cycling. Then, I get to the login screen and login, only to get a blank screen with only the cursor.

Now, If I go into a TTY and look at Xorg.0.log, there's one weird thing: Xorg seems to think all of my devices are keyboards. I can't post a copy of it, unfortunately. If I look at journalctl --human, I see a lot of lines saying that i2c_hid_get_input generates incomplete report. I am not sure how to interpret those.

The first time, I fixed it by reinstalling the system. Now I really don't want to do this anymore.

I'm on Ubuntu 18.04 with GNOME, and I'd like to use use fcitx instead of iBus because I usually type East Asian languages. I installed the fcitx package, went into Language Support, and changed "keyboard input method system" to fcitx. However, after I reboot, I still get the iBus input method menu. How can I finally get rid of iBus and switch fully to fcitx?

(Please do not convince me to stay with iBus; Sun Pinyin and ibus-mozc are virtually unusable.)

UPDATE:
It worked for a while with 375, I think. Then, it suddenly stopped working today. I've tried purging and reinstalling both 384 and 375, but had no luck. They still give me black screens, and nvidia-detector still gives me none.

I've been using CUDA for a while, but I didn't pay too much attention to whether my graphics are rendered by my NVIDIA card.

UPDATE:
I just found out that nvidia-367 was not correctly installed. When I reinstalled it, I begin getting the same problem I've always got: no desktop at all. So, I purged all nvidia drivers (sudo apt purge nvidia-*) and things were good again.

I thought that it might be the driver is too new, so I tried nvidia-340 from the graphic drivers PPA. This time the desktop did show up, but after I opened nvidia-settings and set the system to use my NVIDIA graphics card, I get a login loop after I logged out. I troubleshooted my problem according to the instructions given here, but nothing worked. Any driver newer than nvidia-340 gives me a blank screen.

I've checked my boot (UEFI) settings and I did disable secure boot, so that should not be causing any problems. I've done another glxinfo after I uninstalled all NVIDIA drivers, and it's right here: it looks like Nouveau doesn't even recognize my video card.

I do need to use my NVIDIA card because I do machine learning stuff and need to use CUDA, so I dp need some NVIDIA driver to be installed. My laptop model is Dell Inspiron i7559 and my Linux kernel version is 4.4.0-31-generic, if these matter.

I have installed the nvidia-367 driver successfully, and my desktop does show up (after trying quite a few drivers). However, when I type nvidia-detector into my terminal, none is returned. lspci does correctly lists my graphic card. My NVIDIA graphics card is GeForce GTX 960M.

Update:
I've tried a few drivers, namely nvidia-361, 364 and 370. None of them worked - the best outcome I've got is a login loop (which I could not fix even after searching online), and usually it's a black screen showing up (again, the solutions online and on here just don't work).
glxinfo gives this output: http://paste.ubuntu.com/23316740/, although I personally have no idea what this output means.
And here is what lspci says: 00:02.0 VGA compatible controller: Intel Corporation Skylake Integrated Graphics (rev 06)' and 02:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2).