Same problems here (on Samsung R40Plus),
some additional infos:
dmesg | grep -i radeon
[ 3.414242] [drm] radeon kernel modesetting enabled.
[ 3.414339] fb: switching to radeondrmfb from EFI VGA
[ 3.415143] radeon 0000:01:05.0: VRAM: 256M 0x0000000070000000 -
0x000000007FFFFFFF (256M used)
[ 3.415146] radeon 0000:01:05.0: GTT: 512M 0x0000000080000000 -
0x000000009FFFFFFF
[ 3.415274] [drm] radeon: 256M of VRAM memory ready
[ 3.415276] [drm] radeon: 512M of GTT memory ready.
[ 3.424768] [drm] radeon: 1 quad pipes, 1 z pipes initialized.
[ 3.426141] radeon 0000:01:05.0: WB enabled
[ 3.426146] radeon 0000:01:05.0: fence driver on ring 0 use gpu addr
0x0000000080000000 and cpu addr 0xffff880035a38000
[ 3.426166] [drm] radeon: irq initialized.
[ 3.426387] [drm] radeon: ring at 0x0000000080001000
[ 3.428091] [drm] radeon atom DIG backlight initialized
[ 3.428096] [drm] Radeon Display Connectors
[ 4.040201] fbcon: radeondrmfb (fb0) is primary device
[ 4.040282] radeon 0000:01:05.0: fb0: radeondrmfb frame buffer device
[ 4.040285] radeon 0000:01:05.0: registered panic notifier
[ 4.044113] [drm] Initialized radeon 2.39.0 20080528 for 0000:01:05.0 on
minor 0
------------------------------------------------------------
glxinfo | grep gl
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
GL_ARB_texture_non_power_of_two, GL_ARB_texture_rectangle,
GL_EXT_texture_object, GL_EXT_texture_rectangle, GL_EXT_texture_sRGB,
GL_NV_texture_env_combine4, GL_NV_texture_rectangle, GL_NV_vdpau_interop,
Also affects games on other distros like Mint Mate...
------------------------------------------------------------
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which is subscribed to xserver-xorg-video-ati in Ubuntu.
https://bugs.launchpad.net/bugs/1434826
Title:
Strange artifacts on top of the Unity
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1434826/+subscriptions
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