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I think I was affected by this issue , which lead me to this error message after unloading Xorg :

sudo modprobe radeon
[ 301.718377] [drm:radeon_init] *ERROR* No UMS support in radeon module!

I had to force kms by :

grep radeon /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="radeon.modeset=1"

As suggested I updated kernel :

Linux version 3.16.0-29-generic (buildd@toyol) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #39-Ubuntu SMP Tue Dec 16 20:53:40 UTC 2014

So to move foreward Isnt modeset module arg supposed to be enabled by default ? how to check ?

modinfo radeon | grep modeset
parm: modeset:Disable/Enable modesetting (int)
vermagic: 3.16.0-29-generic SMP mod_unload modversions 686

PROBLEM

Linux version 3.13.0-44-generic (buildd@komainu) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #73-Ubuntu SMP Tue Dec 16 00:23:46 UTC 2014


 dmesg | egrep 'drm|radeon'
[    4.620260] [drm] Initialized drm 1.1.0 20060810
[    5.231024] [drm] radeon userspace modesetting enabled.
[    5.260424] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    5.288641] [drm] No driver support for vblank timestamp query.
[    5.316515] [drm] Initialized radeon 1.34.0 20080528 for 0000:01:00.0 on minor 0



http://askubuntu.com/questions/456060/drmno-driver-support-for-vblank-timestamp-query


 sudo lshw -c video
[sudo] password for default: 
Sorry, try again.
[sudo] password for default: 
  *-display UNCLAIMED     
       description: VGA compatible controller
       product: RV100 [Radeon 7000 / Radeon VE]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:01:00.0
       version: 00
       width: 32 bits
       clock: 66MHz
       capabilities: agp agp-2.0 pm vga_controller bus_master cap_list
       configuration: latency=64 mingnt=8
       resources: memory:f0000000-f7ffffff ioport:ec00(size=256) memory:ff8f0000-ff8fffff memory:ff800000-ff81ffff

lspci -vnn

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] RV100 [Radeon 7000 / Radeon VE] [1002:5159] (prog-if 00 [VGA controller])
	Subsystem: Palit Microsystems Inc. Device [1569:5159]
	Flags: bus master, stepping, 66MHz, medium devsel, latency 64, IRQ 16
	Memory at f0000000 (32-bit, prefetchable) [size=128M]
	I/O ports at ec00 [size=256]
	Memory at ff8f0000 (32-bit, non-prefetchable) [size=64K]
	Expansion ROM at ff800000 [disabled] [size=128K]
	Capabilities: [58] AGP version 2.0
	Capabilities: [50] Power Management version 2
	Kernel modules: radeon, radeonfb


 lsmod  | grep radeon
radeon                742155  0 
i2c_algo_bit           13199  1 radeon
ttm                    65371  1 radeon
drm_kms_helper         45466  1 radeon
drm                   197641  3 drm_kms_helper,ttm,radeon

sudo apt-get install linux-headers-generic-lts-trusty xserver-xorg-video-radeon-lts-trusty  linux-generic-lts-trusty linux-image-generic-lts-trusty

01:00.0 0300: 1002:5159

sudo modprobe radeon
[  301.718377] [drm:radeon_init] *ERROR* No UMS support in radeon module!

SOLUTION

(II) [KMS] drm report modesetting isn't supported.

sudo apt-get install linux-generic-lts-utopic  
grep radeon  /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="radeon.modeset=1"
VERSION="14.04.1 LTS, Trusty Tahr"
ID=ubuntu
cat /proc/version
Linux version 3.16.0-29-generic (buildd@toyol) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #39-Ubuntu SMP Tue Dec 16 20:53:40 UTC 2014

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radeon_7000_ve.txt · Last modified: 2020/09/08 20:47 (external edit)
 
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