diehl Posted January 31, 2006 Report Share Posted January 31, 2006 I just upgraded my Mandriva 2006 system to kernel 2.6.12-15 and now DVD writing with k3b is really slow: 0.30x speed! Other posts suggest this problem is due to DMA being turned off. Doing "grep DMA /var/log/messages" shows Jan 31 07:59:55 simba kernel: hdc: DMA timeout retry Jan 31 07:59:55 simba kernel: hdc: timeout waiting for DMA which I think indicates that indeed DMA is not being used (/dev/hdc is my DVD writer). However hdparm says DMA is on: hdparm /dev/hdc /dev/hdc: IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead = 256 (on) HDIO_GETGEO failed: Invalid argument Any ideas how to fix this problem? Previously I had been able to write DVDs at a decent speed (4x) so I do not think this is an intrinsic drive problem. Quote Link to comment Share on other sites More sharing options...
scarecrow Posted January 31, 2006 Report Share Posted January 31, 2006 Is there a /dev/hdd (slave device to the DVD writer)? What is it, if existing? Are you using new (80-wire) or old (40-wire) IDE ribbon? Quote Link to comment Share on other sites More sharing options...
diehl Posted January 31, 2006 Author Report Share Posted January 31, 2006 I have "fixed" my problem by reverting to kernel 2.6.12-12 (had been using 2.6.12-15). I conclude that the newer kernel has some error whereby it turns DMA off on the drive. I have reported this Mandriva. Anyway, with the older kernel I can write DVD at normal speeds. I do have a /dev/hdd disk (a CDROM burner) , but its not clear that is relevant. Quote Link to comment Share on other sites More sharing options...
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