Created attachment 796098 [details]
dmesg for kernel-3.11.0-0.rc0.git3.1.fc20.x86_64 has normal cursor shape

Created attachment 796101 [details]
dmesg for kernel-3.11.0-0.rc0.git6.1.fc20.x86_64 has mishapen mouse cursor

Created attachment 796102 [details]
dmesg for kernel-3.12.0-0.f0.git11.1.fc21.x86_64 has mishapen mouse cursor

some mouse results of various kernels on toshiba satellite L75D-A7283 with A4-5000 APU with embedded Radeon HD8330 video chip:

0) $ uname -a
Linux localhost.localdomain 3.11.0-0.rc0.git2.1.fc20.x86_64 #1 SMP Mon Jul 8 20:15:11 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

kernel-3.11.0-0.rc0.git2.1.fc20.x86_64   
  mouse cursor ok not squished, 
  no brightness control 
    ( no echo acpi_video0, no radeon_bl0 to echo, 
      brightness slider exists but no brightness change, 
      no freeze on move), 
  background of some white/gray windows have static noise flickering
  (forexample the comment boxes in bugzilla webpage)

1)
==> kernel-3.11.0-0.rc0.git3.1.fc20.x86_64   
  mouse cursor ok not squished,
  static, slider move but doesntchange brightness though didnt freeze

2) 
==>kernel-3.11.0-0.rc0.git6.1.fc20.x86_64  
  vertically squished mouse cursor,
  no static, 
  echo acpi_video0 causes freeze, 
  echo radeom_bl0 changes brightness ok, 
  settings-power-brightness_slider causes freeze

3)
kernel-3.11.0-0.rc0.git7.1.fc20.x86_64    not tested

4)
kernel-3.11.0-0.rc1.git0.1.fc20.x86_64   
   vertically squished mouse cursor, 
   also artifact 5xwidth of cursor and color of desktop background follows cursor around screen,
   acpi_video0 exists but echo causes freeze, 
   radeon_bl0 exists and echo sucessfully changes brightness

5)
kernel-3.11.0-3.fc20.x86_64   
  vertically squished mouse cursor, 
  echo acpi_video0 doesnt freeze but doesnt change brightness, 
  echo radeon_bl0 successfully changes brightness, (slider not tested)

6)
kernel-3.11.0-300.fc20.x86_64            
  vertically squished mouse cursor,
  echo acpi_video0 freezes, 
  echo radeon_bl0 successfully changes brightness, 
  slider causes freeze

7)
kernel-3.12.0.0.rc0.git11.1.fc21.x86_64 
  vertically squished mouse cursor,
  echo acpi_video0 causes freeze , 
  echo radeon_bl0 successfully changes brightness, 
  no brightness slider on settings-power page

Probably relevant:
https://bugs.freedesktop.org/show_bug.cgi?id=33183

8) 
kernel-3.12.0-0.rc3.git1.1.fc21.x86_64
linux-firmware-20131001-32.git8ac7c7e.fc19.x86_64 
  ('update to new git, drop radeon patches')
microcode_ctl-2:2.1-2.fc21.x86_64 
  ( amd already has been moved to linux-firmware package )

  vertically squashed mouse cursor,
  echo acpi_video0 causes freeze,
  echo radeon_bl0 successfully changes brightness
  no brightness slider on settings-power page

item#6 of comment#4 already reported on kernel-3.11.0-300.fc20.x86_64 running on top of an otherwise fc19 install but the squashed cursor also exists in the fc20-alpha livecd which also uses kernel-3.11.0-300.fc20.x86_64

fc20-alpha-livecd nice :') but still broke:
  vertically squashed cursor
  echo acpi_video0 untested
  echo radeon_bl0 successfully changes brightness
  brightness slider doesnt change brightness but locks up sysem
  keyboard brightness slider untested

6.01) kernel-3.11.6-301.fc20.x86_64
  vertically squashed cursor
  echo acpi_video0 untested
  echo radeon_bl0 successfully changes brightness
  brightness slider doesnt change brightness but locks up sysem

8.01) kernel-3.12.0-0.rc6.git1.1.fc21.x86_64
  vertically squashed cursor
  echo acpi_video0 untested
  echo radeon_bl0 successfully changes brightness
  brightness slider doesnt change brightness but locks up sysem

found 'workaround' that if add kernel option 'pci=noacpi' at boot when working with fedora20 system with the effected kernels that squashing of the cursor doesnt occur. :')

9) 
kernel-3.13.0-0.rc0.git5.1.fc21.x86_64 on fedora20 system
  vertically squashed cursor 
     (unless add 'pci=noacpi' or 'acpi=off' kernel options :.) )
  echo acpi_video0 untested 
     ( '/sys/class/backlight/acpi_video0' doesnt exist)
  echo radeon_bl0 successfully changes brightness 
     ( 'echo 40 > /sys/class/backlight/radeon_bl0/brightness')
  brightness slider successfully changes brightness

improved without using 'pci=noacpi' workaround: 

10)
kernel-3.13.0-0.rc2.git0.1.fc21.x86_64 on fedora20 system
  mouse cursor ok, not squished (ok and not using 'pci=noacpi' :') )
  echo acpi_video0 successfully changes brightness
     ( '/sys/class/backlight/acpi_video0' exists now)
  echo radeon_bl0 successfully changes brightness :')
  brightness slider successfully changes brightness :')

(fyi, something in the neighborhoods of 
  kernel-3.13.0-0.rc1.git3.1.fc21.x86_64 
    (kernel greater than rc1.git1.1?) 
  and 
  systemd-208-6.fc20.x86_64 
    (systemd greater than 207?) 
seem to work together to make the brightness not forgetfull anymore :') )

leaving bug open (fc20 kernels are not booting well for me right now)

kernel-3.12.5-301.fc20.x86_64 on fedora20 system
  mouse cursor ok, not squashed (ok and not using 'pci=noacpi' :') )
  echo acpi_video successfully changes brightness
     ( '/sys/class/backlight/acpi_video0' exists now)
  echo radeon_bl0 successfully changes brightness :')
  brightness sliders successfully chcange brightness :')
     ( works with both the settings-power and the toolbar sliders)
  brightness not forgetful now :')

kernel-3.13.0-0.rc4.git0.1.fc21.x86_64 on fedora20 system
  still works
  brightness not forgetfull

so closing this bug and will reopen if breaks. 

thanks :')