The last two times that I have resumed my laptop from sleep, it has hung and given me this set of errors:

[drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 1sec aborting
[drm:atom_execute_table_locked] *ERROR* atombios stuck executing E692 (len 460, WS 0, PS 4) @0xE6D3
hda_intel: azx_get_responce timeout, switching to single_cmd mode: last cmd=0x01170700
ata6: softreset failed (device not ready)
ata4: softreset failed (device not ready)
[drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 1sec aborting
[drm:atom_execute_table_locked] *ERROR* atombios stuck executing E692 (len 460, WS 0, PS 4) @0xE6D3

The last two messages repeat two more times. The first time this happened, Linux's Magic SysRq worked and did a soft reboot, and after that everything was fine till it went to sleep again. It wakes up and gives me this. Here are the laptop stats:

• Toshiba Satellite L455D-S5976
• AMD Sempron SI-42 Processor
• 2GB DDR2 RAM
• HD TruBrite Display
• ATI Radeon Graphics (integrated)
• Running Ubuntu 10.10 32 bit

I'm not sure about the hard drive, but its a 250GB drive with one NTFS partition, two Hidden NTFS, one Linux Swap, and one Ext4. Can someone tell me whats wrong with my laptop? NOTE: This only happens when I close the screen. My computer doesn't go to sleep with the screen open.