Blank display on Ubuntu 19.10 on Ryzen 3 2200G and Ryzen 5 2400G APUs
Submitted by mor..@..il.com
Assigned to Default DRI bug account
Link to original bug (#112288)
Description
Filing bug report here on request by Ubuntu bug team, please see discussion on https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-amdgpu/+bug/1848900
My problem arose after upgrading Ubuntu 19.04 -> 19.10. The lighted welcome screen displays fine, but when I try to log in I get a black screen and the monitor appears to be frozen (can't switch to virtual terminal either). The machine is running normally and I can log on via ssh.
Other users in the above mentioned bug on LP have different variations of the same problems, some have problems using the live DVD.
Activity
Attachment 145957, "dmesg output":
dmesg.txt
Hi,
I'm the Peter D. who raised the Ubuntu bug report - writing from a different email address. I can probably bisect the kernel with a little gentle instruction.
Initial results are;
Raven ridge APU, VGA port, slow monitor (75Hz max refresh rate),
booting with nomodeset gives a stable display, but a very odd result from xrandr.
psd@EE:~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm
1920x1080 77.00*
psd@EE:~$
Booting new kernels (5.3 onwards?) and no "nomodeset" gives either a blank screen or a very unstable screen with lots of pixelation and a high risk of going black. Here is something that I captured earlier:
psd@EE:~$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DisplayPort-0 disconnected primary (normal left inverted right x axis y axis)
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 298mm
1920x1080 60.00*+
1680x1050 60.00
1280x1024 60.02
1440x900 59.89
1280x800 59.81
1152x864 75.00
1280x720 60.00
1024x768 70.07 60.00
800x600 60.32 56.25
640x480 66.67 59.94
720x400 70.08
psd@EE:~$
"DisplayPort-1" is actually a VGA port. I believe that there is a conversion chop on the motherboard, an ASROCK B450 Pro4.
Give me some time to swap hardware again.All three ports work.
If my computer boots to a blank screen, plugging in a second monitor "resets" the video and both screens display the desktop as clones.
There are two monitors; a slow one with a maximum vertical refresh rate of 75 Hz, and a fast one with a maximum vertical refresh rate of 144 Hz. The fast monitor has DP, HDMI and VGA ports. The slow monitor has VGA and DVI ports. The motherboard has DP, HDMI, and VGA ports. Currently there are cables that can reach ...
MoBo DP fast monitor
Mobo HDMI (passive adapter) DVI slow monitor
Mobo VGA slow monitor
This can be rearranged if need be.
The reset trick has happened with;
the slow monitor plugged into the VGA port and being revived when the fast monitor was plugged into the DP, and with
the fast monitor plugged into the DP and being revived when the slow monitor was plugged into the HDMI port.
Currently using a mainline kernel downloaded from Ubuntu.
psd@EE:~$ uname -a
Linux EE 5.4.0-050400rc7-generic #201911102031 SMP Mon Nov 11 01:34:23 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
psd@EE:~$@daenzersaid:(In reply to Alex Deucher from comment 3)
[ 1.094054] [drm:amdgpu_init [amdgpu]] ERROR VGACON disables amdgpu
kernel modesetting.
Did you enable vga console?
FWIW, that message is due to "nomodeset" on the kernel command line, which was presumably used to work around this problem?This issue hasn't had any activity since 2019-11-19. The AMD driver stack changes rapidly and contains lots of shared code across products so it's possible that it has already been fixed. Please upgrade to a current stable kernel and userspace stack and try again. If you still experience this issue with the latest driver stack, please capture relevant logging and open a new issue referring back to this one.
