Hi, while testing a dvd with mplayer, I noticed, that mplayer is dropping frames and the cpu-scaling is glued to the maximum of 1.73GHz. I think the problem is the disabled dma for the dvd-drive: [root@helios ~]# hdparm -d /dev/hdc /dev/hdc: using_dma = 0 (off) But I can't enable it: [root@helios ~]# hdparm -d 1 /dev/hdc /dev/hdc: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off) After some playing with hdparm hdparm -c3 -u1 -a64 -k1 /dev/hdc seems to improve the situation a lot. The cpu comes down to 800 Mhz and no frame are dropped. But the canoncial solution would be to enable DMA ? Has anyone an idea where the problem lies ? The hardware: [root@helios etc]# dmesg | grep hd hdc: UJDA750 DVD/CDRW, ATAPI CD/DVD-ROM drive hdc: ATAPI 24X DVD-ROM CD-R/RW drive, 2048kB Cache hdc: CHECK for good STATUS hdc: CHECK for good STATUS [root@helios etc]# lspci | grep Intel 00:1f.2 IDE interface: Intel Corporation 82801FBM (ICH6M) SATA Controller (rev 03) cu romal -- fedora-test-list mailing list fedora-test-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-test-list