Hi,

I can confirm this bug with:
00:11.0 SATA controller: ATI Technologies Inc SB700/SB800 SATA Controller [AHCI 
mode]
on a Gigabyte GA-MA78GM-S2H rev. 1.1 with
AMD Sempron(tm) Processor 3000+ 
2 Gigs of ram.
Seagate 1500 GB S-Ata HDD (ST31500341AS)

I get the "softreset failed" error messages during boot, but could
install ubuntu using another mainboard.

Something not already mentioned:
The system doesn't work stable, it comes to freezes when heavy IO load accurs. 
For example downloading an ubuntu iso and copy files from an external drive to 
the internal parallel. The system freezes completely, the mouse doesn't move 
anymore. Sys Magic Req + S does nothing, but Sys Magic Req + B does reboot the 
machine instantly. Strg+Alt+F1 doesn't switch to a terminal anymore.
Another way to reproduce this error is deleting a lot of small files from the 
drive. If I rm -r somedir_With_a_lot_of_files/ the system will freeze after 1-2 
seconds. Nothing responses and work anymore except the  "B" Sys Magic Request 
(Alt+print+B).
It comes only to problems when IO load is caused by write requests, normal read 
operations (and a lof of them for example while indexing the harddrive) causes 
no problems. Also copying files with ssh causes no problems because of the slow 
processor the IO load is not very high.

Deactivating HPET, using all_generic_ide  and switching to IDE mode
(non-ahci) makes no difference.

I've also tried to delete the directory from a ubuntu live cd to be sure
nothing causes the problem that I installed on the HDD. Same result.
System freezes.

What is with the patch? Is it in the kernel now? In vanilla or ubuntu?

-- 
Softreset failed (device not ready)
https://bugs.launchpad.net/bugs/285392
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