Description of problem: I have a Dell Inspiron 6000 laptop, which has a CD/DVD writer combo drive. I recently installed FC5 on it, but it does not enable DMA for the DVD drive, and does not allow me to enable it using hdparm. When I try, using the command hdparm -d 1 /dev/hdc, I get the following error: /dev/hdc: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off) I've done some Googling, and I suspect the problem is the one that's described on this page: http://www.thinkwiki.org/wiki/Problems_with_SATA_and_Linux I also have the "hang on wake up from suspend-to-RAM" problem described on that page, which furthers my suspicion that I have the same problem. The performance of the drive is so bad that I cannot watch DVDs with it. Version-Release number of selected component (if applicable): * FC5 with all the latest updates applied (output of uname -a: Linux speedygonzalez.chaosmanor 2.6.17-1.2174_FC5 #1 Tue Aug 8 15:30:55 EDT 2006 i686 i686 i386 GNU/Linux) How reproducible: * Get a Dell Inspiron 6000 (or presumably any other system with a SATA controller and a harddisk on the first and optical drive on the second channel) * Install FC5 * Run hdparm /dev/hdc and observe that using_dma is set to 0 (off) * Try to enable it with hdparm -d 1 /dev/hdc and observe that it results in an error and DMA is not enabled Actual results: * DMA is not enabled on the optical drive, nor is it possible to enable it Expected results: * It should at least be possible to enable DMA using the hdparm command, but preferably FC5 will enablde DMA automatically Additional info: I've attached the output of dmesg and lspci. Please let me know if additional information is needed or whether you need me to try things out.
Created attachment 135498 [details] Output of dmesg
Created attachment 135499 [details] Output of lspci
Reassigning to correct owner, kernel-maint.
A new kernel update has been released (Version: 2.6.18-1.2200.fc5) based upon a new upstream kernel release. Please retest against this new kernel, as a large number of patches go into each upstream release, possibly including changes that may address this problem. This bug has been placed in NEEDINFO state. Due to the large volume of inactive bugs in bugzilla, if this bug is still in this state in two weeks time, it will be closed. Should this bug still be relevant after this period, the reporter can reopen the bug at any time. Any other users on the Cc: list of this bug can request that the bug be reopened by adding a comment to the bug. In the last few updates, some users upgrading from FC4->FC5 have reported that installing a kernel update has left their systems unbootable. If you have been affected by this problem please check you only have one version of device-mapper & lvm2 installed. See bug 207474 for further details. If this bug is a problem preventing you from installing the release this version is filed against, please see bug 169613. If this bug has been fixed, but you are now experiencing a different problem, please file a separate bug for the new problem. Thank you.
I'm having the same problem with my Dell Latitude D820 laptop. I have experienced this problem with clean FC6 installs, both x86_64 and i386. I'm currently using a jwltest kernel (2.6.18-1.2831.2.1.fc6.jwltest.12) and the problem still exists. I'm able to work around the problem by adding 'combined_mode=libata' as a kernel boot parameter. I haven't tested suspend after doing this, however, so don't know if that will be affected (suspend was working prior to adding the kernel boot parameter). lspci: 00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS/940GML and 945GT Express Memory Controller Hub (rev 03) 00:01.0 PCI bridge: Intel Corporation Mobile 945GM/PM/GMS/940GML and 945GT Express PCI Express Root Port (rev 03) 00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01) 00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 01) 00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 01) 00:1c.2 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 3 (rev 01) 00:1c.3 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 4 (rev 01) 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #1 (rev 01) 00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #2 (rev 01) 00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #3 (rev 01) 00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #4 (rev 01) 00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 01) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e1) 00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 01) 00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) Serial ATA Storage Controller IDE (rev 01) 00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 01) 01:00.0 VGA compatible controller: nVidia Corporation GeForce Go 7400 (rev a1) 03:01.0 CardBus bridge: O2 Micro, Inc. Cardbus bridge (rev 21) 03:01.4 FireWire (IEEE 1394): O2 Micro, Inc. Firewire (IEEE 1394) (rev 02) 09:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5752 Gigabit Ethernet PCI Express (rev 02) 0c:00.0 Network controller: Broadcom Corporation Dell Wireless 1390 WLAN Mini-PCI Card (rev 01) I'll try to add a dmesg attachment.
Created attachment 140790 [details] dmesg output demsg output for comment #5
This is expected (if disappointing) behavior. When two drivers share the hardware, one loses DMA capability. Your best option is to switch from combined mode (legacy) in BIOS to native or AHCI or RAID mode. If your BIOS doesn't permit this, FC6 kernel should allow booting with "combined_mode=libata" or "combined_mode=ide" on the kernel (GRUB) command line, which also works around this problem.