Am Mittwoch, 24. Juni 2015, 18:41:52 schrieb Greg Kroah-Hartman: > On Thu, Jun 25, 2015 at 07:55:45AM +0800, Jeff Chua wrote: > > On Thu, Jun 25, 2015 at 12:28 AM, Greg Kroah-Hartman > > > > <gre...@linuxfoundation.org> wrote: > > > On Thu, Jun 25, 2015 at 12:22:47AM +0800, Jeff Chua wrote: > > >> Both sda and sdb have the same SSD model. > > > > > > That's a bug in your USB bridge chip, odds are it is not reporting the > > > value properly. There's nothing the scsi core or USB stack can do > > > about > > > this, sorry. Please complain to the hardware manufacturer. > > > > There are workaround boot cmdline parameters for other things ... any > > chance to consider one to fix broken rotational option? I'm not sure > > how many out there are broken, but I really would like a faster way to > > access my USB SSD without waiting for the "disk spinup". > > Just like module paramaters, boot command lines are not for device > specific attributes, sorry. Again, please contact the manufacturer to > get this fixed. We can't add a quirk for this bridge because it would > not work if you really put a rotational disk behind it.
How about a way to override it in sysfs directly during runtime just for a device individually, like choosing an I/O scheduler for example? > Given the cheap cost of these types of bridges, I recommend just getting > one that works. That is an option as well and may educate hardware manufacturers to look a bit better at the quality of those devices (at least then Linux market share in that market increases). Thanks, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
