Ubuntu 11.04 running slow on Presario CQ56 with Mobility Radeon 4200

Can you give the output of:

sudo lshw -C display;lsb_release -a; uname -a

Thanks

SCSI
  *-display
       description: VGA compatible controller
       product: M880G [Mobility Radeon HD 4200]
       vendor: ATI Technologies Inc
       physical id: 5
       bus info: pci@0000:01:05.0
       version: 00
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi vga_controller bus_master cap_list rom
       configuration: driver=fglrx_pci latency=0
       resources: irq:18 memory:c0000000-cfffffff ioport:3000(size=256) memory:d0300000-d030ffff memory:d0200000-d02fffff
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 11.04
Release: 11.04
Codename: natty
Linux Presario-CQ56 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

Have you tried removing the driver, then reinstalling it?

I have tried to reinstall Ubuntu alltogether, without any luck in getting the acceleration to work satisfactory.

Thank you for the quick answer!

The same issue occurs on an HP Pavilion dv7 using the ATI/AMD proprietary FGLRX graphics driver.

Might be the same issue as Question #160346

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

Are there similar findings on other systems with this graphic card?

New output :

*-display
       description: VGA compatible controller
       product: M880G [Mobility Radeon HD 4200]
       vendor: ATI Technologies Inc
       physical id: 5
       bus info: pci@0000:01:05.0
       version: 00
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi vga_controller bus_master cap_list rom
       configuration: driver=fglrx_pci latency=0
       resources: irq:18 memory:c0000000-cfffffff ioport:3000(size=256) memory:d0300000-d030ffff memory:d0200000-d02fffff
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 11.04
Release: 11.04
Codename: natty
Linux Presario-CQ56 2.6.38-10-generic #44-Ubuntu SMP Thu Jun 2 21:32:22 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

Uninstalled the driver which was provided from the Ubuntu repositories and installed the 11.6-driver from AMD.

After a clean install of Ubuntu, the problem seems to be to a much lesser extent than before.