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[gene <eumospan@xxxxxxxxx>]

I should confirm this too. As a matter of fact, even when kms is
disabled, the video is somewhat slower than it used to be on koala. For
instance, switching windows is rather sluggish. This last one is
probably related to the the poor memory management.

Well, this issue is nothing compared to the main issue - regular system freezes. Is it a different bug? 
Here's what I see in the logs when dri/kms is on:

May  4 00:14:38 mykernel kernel: [31854.648052] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id
May  4 00:20:24 mykernel kernel: [32200.377989] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id
May  4 00:26:40 mykernel kernel: [32576.900863] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id
May  4 00:32:35 mykernel kernel: [32932.021549] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id
May  4 00:33:22 mykernel kernel: [32978.813129] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id
May  4 00:34:32 mykernel kernel: [33048.605073] UDP: short packet: From 0.0.0.0:0 0/131 to 0.112.23.247:0
May  4 16:26:14 mykernel kernel: [90150.939663] UDP: short packet: From 0.0.0.0:4096 0/131 to 0.112.23.247:0
May  4 16:38:32 mykernel kernel: [90889.164643] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -12!
May  4 17:16:18 mykernel kernel: [93154.924710] UDP: short packet: From 0.0.0.0:0 0/131 to 0.112.23.247:0
May  4 20:44:48 mykernel kernel: [105665.147283] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -12!
May  4 20:47:52 mykernel kernel: [105848.705980] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -12!
May  4 20:52:28 mykernel kernel: imklog 4.2.0, log source = /proc/kmsg started.
May  4 20:52:28 mykernel kernel: [    0.000000] Initializing cgroup subsys cpuset
May  4 20:52:28 mykernel kernel: [    0.000000] Initializing cgroup subsys cpu

-- 
[RC410] Radeon X200m poor graphics performance with KMS+DRI
https://bugs.launchpad.net/bugs/576125
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