No signal after upgrading on 18.04

[Dal]

Basically, yesterday I upgraded from 17.10 to 18.04 Bionic Beaver. At the reboot, when I boot onto Ubuntu, after the GRUB has been shown, it just boots to nothing, my screen display "No signal detected", although I can hear the drum sound. Using nomodeset works but my computer is set at a wrong frequency (stuck to 77Hz, even forcing via xrandr doesn't work). So using nomodeset I got into i3, downloaded mesa drivers and tried radeon too, and rebooted. Now still shows no signal, but I can get into a fluent 60Hz i3, if I go to recovery mode, then press normal boot. The problem also with that is that GNOME doesn't work, when I leave i3, log onto GNOME, it shows a blackscreen and just sends me back to the login menu. I've noticed this error appeared at boot: [drm:amdgpu_init [amdgpu]] *ERROR* VGACON disables amdgpu kernel modesetting.

Here's xrandr output: xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm
   1920x1080 0.00*
   1280x1024 0.00
   1024x768 0.00
   800x600 0.00
   640x480 0.00

Thanks for any future help!

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

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[Jhonny Oliveira (jhonny-oliveira)]

I'm not entirely sure if this is related, but I'm also having the same error and games that rely on opengl stoped working since (~02/03/2018 - dd-mm-yyyy):

I have an AMD Radeon HD 7850 installed.

It seems to be related to the xorg update or the other ones around (please see attachment):
/var/log/apt/history
xserver-xorg-core:amd64 (2:1.19.6-1ubuntu1, 2:1.19.6-1ubuntu2)

/var/log/kernel
Mar 15 19:21:22 dktp kernel: [ 2.118654] [drm] VGACON disable radeon kernel modesetting.
Mar 15 19:21:22 dktp kernel: [ 2.118687] [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module!
Mar 15 19:21:22 dktp kernel: [ 2.216849] [drm:amdgpu_init [amdgpu]] *ERROR* VGACON disables amdgpu kernel modesetting.

Making a basic tests, it seems to perform better with software rendering... ?!?

$ glxgears -info
GL_RENDERER = AMD PITCAIRN (DRM 2.50.0 / 4.15.0-11-generic, LLVM 5.0.1)
GL_VERSION = 3.0 Mesa 18.0.0-rc4
GL_VENDOR = X.Org
(...)
VisualID 1064, 0x428
355 frames in 5.0 seconds = 70.940 FPS
300 frames in 5.0 seconds = 59.997 FPS

$ LIBGL_ALWAYS_SOFTWARE=1 glxgears -info
GL_RENDERER = llvmpipe (LLVM 5.0, 128 bits)
GL_VERSION = 3.0 Mesa 18.0.0-rc4
GL_VENDOR = VMware, Inc.
(...)
VisualID 1064, 0x428
6604 frames in 5.0 seconds = 1320.753 FPS
6758 frames in 5.0 seconds = 1351.475 FPS

Further details:
$ xdpyinfo | grep DRI
    DRI2
    DRI3
$ lspci -k | grep -EA3 'VGA|3D|Display'
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Pitcairn PRO [Radeon HD 7850 / R7 265 / R9 270 1024SP]
 Subsystem: PC Partner Limited / Sapphire Technology Radeon HD 7850 2GB GDDR5 DVI-I/DVI-D/HDMI/DP
 Kernel driver in use: radeon
 Kernel modules: radeon, amdgpu

Can anyone help?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Jhonny Oliveira (jhonny-oliveira)]

Today's xorg and mesa updates fixed my problem!

[C4-timah (c4-timah)]

I having the same error with a clean install and am foreced to use 'nomodeset' just to get to the desktop. Any attempt to install the proper AMD drivers just puts me right back to a blackscreen on bootup.

[drm:amdgpu_init [amdgpu]] *ERROR* VGACON disables amdgpu kernel modesetting

Current Graphics: llvmpipe (LLVM 6.0, 128 bits)

Cannot play Arma 3 on steam or any games for that matter as Open GL is not enabled.

[Daniel van Vugt (vanvugt)]

Dal,

Please run these commands:

  lspci -k > lspcik.txt
  lscpu > lscpu.txt

and then send us the resulting files 'lspcik.txt' and 'lscpu.txt'.

---

Everyone else, please log your own new bugs.

[Launchpad Janitor (janitor)]

[Expired for xorg-server (Ubuntu) because there has been no activity for 60 days.]