Comment 7 for bug 728423

Me too. The visual artifacts seems to appear mostly as the shift switcher restores the layout post-switch. I have attached a screenshot and also attach a very brief video for forensics.

Ubuntu 11.10 (Oneiric). ATI Radeon HD 5670 (PCIe, Saphire brand). Stock fglrx driver:

ii fglrx 2:8.881-0ubuntu4.1 Video driver for the AMD graphics accelerators
ii fglrx-amdcccle 2:8.881-0ubuntu4.1 Catalyst Control Center for the AMD graphics accelerators

Output of lshw:

root@s3:~# lshw -C video
  *-display
       description: VGA compatible controller
       product: Redwood [Radeon HD 5670]
       vendor: ATI Technologies Inc
       physical id: 0
       bus info: pci@0000:01:00.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
       configuration: driver=fglrx_pci latency=0
       resources: irq:50 memory:d0000000-dfffffff memory:fdec0000-fdedffff ioport:ee00(size=256) memory:fde00000-fde1ffff

I do not have the visual artifact problems with shift switcher on a similar machine running 10.04 LTS, although it's video card is on the motherboard (ATI Radeon HD 4200 on Asus M4A785TD-V motherboard). That machine also uses official Ubuntu fglrx driver.