2010/8/30 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>: > On Fri, 27 Aug 2010, [UTF-8] Pali Rohár wrote: > >> Hello, >> >> For 4 years of using linux I have problem with my USB devices on my >> desktop PC. When was mouse (SD card reader, ...) plugged, still lights >> (and after shutdown too). Finally some days ago I found solution of my >> problem on page https://bugzilla.kernel.org/show_bug.cgi?id=5410 . >> Here is also defined this problem. >> >> I write new patch file >> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/42149/+attachment/1484850/+files/usb-new.patch >> and this solve my problem. When I rmmod module ohci-hcd (or shutdown >> PC) all USB devices power off too. >> >> Without this patch, I tried echo suspend > >> /sys/bus/usb/devices/$USB/power/level . When module ohci-hcd was >> loaded, $USB power off. But when I rmmod ohci-hcd, all USB devices >> immediately power on (same after shutdown PC), it ignore power/level >> settings. >> >> With this patch I dont change power/level, it automatically power off >> USB devices when ohci-hcd is unloaded. >> >> Sorry, but I dont understand what this usb modules in kernel doing, >> I'm only linux kernel user. > > The problem is that your patch leaves the controller running and able > to write to memory after that memory has been released. This is not > safe. > > What the USB devices do when you rmmod ohci-hcd doesn't matter very > much. After all, ohci-hcd will be loaded when your machine is running > normally. > > What happens when you shut down the system _does_ matter. In this > situation it should be okay to leave the controller running, since the > memory won't be released before the system turns off. > > But for maximum safety, we shouldn't do this unless it is really > needed. Since all the affected systems seem to have nVidia > controllers, that's what we should test for. > > Can you send the "lspci -nn" output for your USB controllers? > > Alan Stern > > Hello, I have motherboard Gigabyte GA-K8NF-9-RH with Nvidia nForce 4 chipset. Here Is output from lspci: 00:00.0 Memory controller [0580]: nVidia Corporation CK804 Memory Controller [10de:005e] (rev a3) 00:01.0 ISA bridge [0601]: nVidia Corporation CK804 ISA Bridge [10de:0050] (rev a3) 00:01.1 SMBus [0c05]: nVidia Corporation CK804 SMBus [10de:0052] (rev a2) 00:02.0 USB Controller [0c03]: nVidia Corporation CK804 USB Controller [10de:005a] (rev a2) 00:02.1 USB Controller [0c03]: nVidia Corporation CK804 USB Controller [10de:005b] (rev a3) 00:04.0 Multimedia audio controller [0401]: nVidia Corporation CK804 AC'97 Audio Controller [10de:0059] (rev a2) 00:06.0 IDE interface [0101]: nVidia Corporation CK804 IDE [10de:0053] (rev f2) 00:07.0 IDE interface [0101]: nVidia Corporation CK804 Serial ATA Controller [10de:0054] (rev f3) 00:08.0 IDE interface [0101]: nVidia Corporation CK804 Serial ATA Controller [10de:0055] (rev f3) 00:09.0 PCI bridge [0604]: nVidia Corporation CK804 PCI Bridge [10de:005c] (rev a2) 00:0a.0 Bridge [0680]: nVidia Corporation CK804 Ethernet Controller [10de:0057] (rev a3) 00:0b.0 PCI bridge [0604]: nVidia Corporation CK804 PCIE Bridge [10de:005d] (rev a3) 00:0c.0 PCI bridge [0604]: nVidia Corporation CK804 PCIE Bridge [10de:005d] (rev a3) 00:0d.0 PCI bridge [0604]: nVidia Corporation CK804 PCIE Bridge [10de:005d] (rev a3) 00:0e.0 PCI bridge [0604]: nVidia Corporation CK804 PCIE Bridge [10de:005d] (rev a3) 00:18.0 Host bridge [0600]: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration [1022:1100] 00:18.1 Host bridge [0600]: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map [1022:1101] 00:18.2 Host bridge [0600]: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller [1022:1102] 00:18.3 Host bridge [0600]: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control [1022:1103] 01:0a.0 FireWire (IEEE 1394) [0c00]: Texas Instruments TSB82AA2 IEEE-1394b Link Layer Controller [104c:8025] (rev 01) 05:00.0 VGA compatible controller [0300]: nVidia Corporation NV43 [GeForce 6600 GT] [10de:0140] (rev a2) -- Pali Rohár pali.rohar@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
