No UMS support in radeon module

Asked by Mario Sobrero on 2017-11-01

After upgrading my lubuntu to "Ubuntu 17.10 - 4.13.0-16-generic Kernel" I get a black screen after boot, probably for the following problem:

dmesg | egrep 'drm|radeon'

Result:

[ 2.493943] [drm] VGACON disable radeon kernel modesetting.
[ 2.494058] [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module!
[ 18.891836] [drm] VGACON disable radeon kernel modesetting.
[ 18.891896] [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module!
[ 27.041720] [drm] VGACON disable radeon kernel modesetting.
[ 27.041818] [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module!

If I run the following command:

lspci -nn | grep VGA

I get the following result:
VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] RV370/M22 [Mobility Radeon X300] [1002:5460]

NB: my system actually runs only in recovery mode

Any suggestions?

Question information

Language:
English Edit question
Status:
Solved
For:
Ubuntu linux Edit question
Assignee:
No assignee Edit question
Solved by:
actionparsnip
Solved:
2017-11-01
Last query:
2017-11-01
Last reply:
2017-11-01

If you boot an older kernel is it OK?

Mario Sobrero (mariosobrero) said : #2

No, it runs only via recovery mode

If you add the boot option:

radeon.modeset=0

Does it help?

Mario Sobrero (mariosobrero) said : #6

after adding the following line in the grub file (by sudo leafpad /etc/default/grub):

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.modeset=0"

problem fixed! Many thanks!

Mario Sobrero (mariosobrero) said : #7

Thanks actionparsnip, that solved my question.