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Lubuntu display Xorg service goes to black "Cpu pipe b fifo underrun"

 3/31/2020 07:32:00 p.m.  No comments

I installed Lubuntu on a DELL Latitude 2110 and, When I log in, it works alright, it runs the lightdm session manager and everything appears to be working alright, except for the display.

The display stops in black screen and nothing I can do.
When I press the “Ctrl+Alt+F1” keys combination, quits black screen, however, I can read the kernel message invading my bash prompt:

   [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

Solution

The default method is SNA (as of 2013-08-05), which is less stable, but faster. Review the benchmarks made by Phoronix. UXA is still a solid choice if you experience problems with SNA.
To use the old UXA acceleration method, you must create the /etc/X11/xorg.conf.d/20-intel.conf file with the following content:

It was just a matter of following the recommendation that was given when I installed the video driver xf86-video-intel:

This driver uses SNA as the default acceleration method. You can try
falling back to UXA if you run into trouble. To do so, save a file with
the following content as /etc/X11/xorg.conf.d/20-intel.conf:

 Section "Device"
 Identifier "Intel Graphics"
 Driver "intel"
 Option "AccelMethod" "uxa"
 #Option "AccelMethod" "sna"
 EndSection

Replies:)

  • I had the very same issue until moments ago with a Dell Inspiron 13 7348. Solved with the same method.
  • Thanks man…. you helped me solve the same problem on my Asus Zenbook UX305!!
  • I guess “SNA vs UXA” is the new “Nvidia vs ATI”.

*English post

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