DMA is enabled, disc access does slow down the computer noticeably
though.

This is the reason why I started to look whether DMA was enabled.

Do you have anything else I could try to get back the original
performance?

[   53.018256] libata version 2.00 loaded.
[   53.022606] pata_via 0000:00:11.1: version 0.2.0
[   53.023078] ACPI: PCI Interrupt Link [ALKA] BIOS reported IRQ 0, using IRQ 20
[   53.023083] ACPI: PCI Interrupt Link [ALKA] enabled at IRQ 20
[   53.023093] ACPI: PCI Interrupt 0000:00:11.1[A] -> Link [ALKA] -> GSI 20 
(level, low)
[   53.023166] ata1: PATA max UDMA/133 cmd 0x1F0 ctl 0x3F6 bmdma 0xE400 irq 14
[   53.023217] ata2: PATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xE408 irq 15
[   53.023248] scsi1 : pata_via
[   53.239025] scsi 0:0:5:0: CD-ROM            TEAC     CD-R58S          1.0H 
PQ: 0 ANSI
[   53.239058]  target0:0:5: Beginning Domain Validation
[   53.247569] ata1.00: ATA-6, max UDMA/100, 390719855 sectors: LBA48
[   53.247573] ata1.00: ata1: dev 0 multi count 16
[   53.255264]  target0:0:5: FAST-10 SCSI 10.0 MB/s ST (100 ns, offset 15)
[   53.265984]  target0:0:5: Domain Validation skipping write tests
[   53.265987]  target0:0:5: Ending Domain Validation
[   53.269738] ata1.00: configured for UDMA/100

-- 
hdparm is busted in the hd? -> sd? change
https://launchpad.net/bugs/73889

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