That's to be expected as it's still a Series 315 chip.
The bug is with 315 series (SiS 315/E/PRO, 550, [M]650, 651, 740, [M]661[FMG]X,[M]741[GX]) chips.
See https://wiki.ubuntu.com/QuantalQuetzal/ReleaseNotes/CommonInfrastructure at the bottom for a workaround.
That's to be expected as it's still a Series 315 chip.
The bug is with 315 series (SiS 315/E/PRO, 550, [M]650, 651, 740, [M]661[ FMG]X,[ M]741[GX] ) chips.
See https:/ /wiki.ubuntu. com/QuantalQuet zal/ReleaseNote s/CommonInfrast ructure at the bottom for a workaround.