Hi One of my monitors is connected via Displaylink, USB 2.0. This has always worked perfectly but on upgrading to Buster, that monitor now only comes up with screen corruption. Error messages from journalctl:
jul 08 15:46:14 debian kernel: udl 3-1.4.1:1.0: swiotlb buffer is full (sz: 360448 bytes) jul 08 15:46:14 debian kernel: udl 3-1.4.1:1.0: DMA: Out of SW-IOMMU space for 360448 bytes jul 08 15:46:20 debian kernel: udl 3-1.4.1:1.0: swiotlb buffer is full (sz: 1245184 bytes) jul 08 15:46:20 debian kernel: udl 3-1.4.1:1.0: DMA: Out of SW-IOMMU space for 1245184 byte Downgrading to an older kernel removes the error messages, but also leaves the monitor blank. Since this is pretty annoying, I would like to help solve this. However, I've no clue what to file a bug against. Any hint would be very appreciated. Kind regards Jan
