$ dmesg|grep radeon
[    1.591024] [drm] radeon kernel modesetting enabled.
[    1.591049] fb: conflicting fb hw usage radeondrmfb vs VESA VGA - removing generic driver
[    1.591337] radeon 0000:01:00.0: VRAM: 1024M 0x0000000000000000 - 0x000000003FFFFFFF (1024M used)
[    1.591338] radeon 0000:01:00.0: GTT: 512M 0x0000000040000000 - 0x000000005FFFFFFF
[    1.591387] [drm] radeon: 1024M of VRAM memory ready
[    1.591387] [drm] radeon: 512M of GTT memory ready.
[    1.931251] radeon 0000:01:00.0: WB enabled
[    1.931253] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff880401905c00
[    1.931255] radeon 0000:01:00.0: fence driver on ring 1 use gpu addr 0x0000000040000c04 and cpu addr 0xffff880401905c04
[    1.931256] radeon 0000:01:00.0: fence driver on ring 2 use gpu addr 0x0000000040000c08 and cpu addr 0xffff880401905c08
[    1.931257] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff880401905c0c
[    1.931258] radeon 0000:01:00.0: fence driver on ring 4 use gpu addr 0x0000000040000c10 and cpu addr 0xffff880401905c10
[    1.931286] radeon 0000:01:00.0: irq 54 for MSI/MSI-X
[    1.931292] radeon 0000:01:00.0: radeon: using MSI.
[    1.931313] [drm] radeon: irq initialized.
[    1.958346] [drm] radeon: power management initialized
[    2.093026] fbcon: radeondrmfb (fb0) is primary device
[    2.118003] radeon 0000:01:00.0: fb0: radeondrmfb frame buffer device
[    2.118005] radeon 0000:01:00.0: registered panic notifier
[    2.118008] [drm] Initialized radeon 2.30.0 20080528 for 0000:01:00.0 on minor 0
[   38.924853] radeon 0000:01:00.0: bo ffff880405a44400 don't has a mapping in vm ffff8803ff101280
[   38.924893] radeon 0000:01:00.0: bo ffff880405a44000 don't has a mapping in vm ffff8803ff101280
[   38.924925] radeon 0000:01:00.0: bo ffff880405a46c00 don't has a mapping in vm ffff8803ff101280
[   38.924957] radeon 0000:01:00.0: bo ffff880405a46800 don't has a mapping in vm ffff8803ff101280
[   38.924988] radeon 0000:01:00.0: bo ffff880405a47400 don't has a mapping in vm ffff8803ff101280
[   38.925020] radeon 0000:01:00.0: bo ffff880405a47000 don't has a mapping in vm ffff8803ff101280
[ 2931.113923] radeon 0000:01:00.0: bo ffff8803ff640400 don't has a mapping in vm ffff880403690d00
[ 2931.114001] radeon 0000:01:00.0: bo ffff8803ff641800 don't has a mapping in vm ffff880403690d00
[ 2931.114069] radeon 0000:01:00.0: bo ffff8803ff640800 don't has a mapping in vm ffff880403690d00
[ 2931.114138] radeon 0000:01:00.0: bo ffff8803ff641000 don't has a mapping in vm ffff880403690d00
[ 2931.114219] radeon 0000:01:00.0: bo ffff8803ff647c00 don't has a mapping in vm ffff880403690d00
[ 2931.114290] radeon 0000:01:00.0: bo ffff8803ff647400 don't has a mapping in vm ffff880403690d00