..I got the problem of USB3 devices not being recognized at boot, also
with "USB Legacy" enabled. Leading me to the question:
Did anyone else experience this?
Can I tweak anything in the OS/kernel to maximize the likelihood of USB3
device recognition success at boot?
This is also in a new constellation of devices, now two Realtek
RTL8153:s. For now as bandaid I'll plug one to USB2 and one to USB3.
Tinker
On 2017-06-02 00:06, Tinker wrote:
> Hi misc@,
>
> This is a weird issue. I resolved it for my usecase but just wanted to
> report it and also ask if it's a bug or feature and if there's any
> right or wrong way here.
>
> So I have one AXEN and one RTL8153(CDCE) gigabit USB NIC plugged in to
> a Xeon Asrock E3C226D2I motherboard.
>
> It's 6.0 MP generic + the RTL8153 support diff, booted via MBR.
>
>
> Until two days ago they were accidentally plugged into an USB 2 port,
> and also I had the "USB Legacy Mode" BIOS setting set to its default
> enabled setting ("USB Legacy mode: Auto" + "USB3 Legacy Mode: Enabled"
> more specifically).
>
> Up to that point, both the AXEN and the CDCE would be recognized every
> single time I booted (i.e. they would show up in the dmesg, and would
> produce interfaces).
>
> Then, two days ago, I disabled the "USB Legacy Mode" as part of
> debugging the AXEN NIC which has behaved very strangely to me - I
> disabled the USB legacy mode out of the idea that it could cause
> interference with OpenBSD's USB/AXEN subsystems, and also the
> motherboard manual suggests doing it in case of "USB compatibility
> issues", which I maybe experienced.
>
> The devices would still be recognized when I booted, still all fine in
> this respect.
>
>
> And then the same day I switched over to use the USB 3 ports, and I
> think initially the USB devices would come up as they should on boot,
> but then at least yesterday, on at least seven different boots -
> either just "halt -p" and then power on (meaning the USB devices were
> powered all the time), or hard power-off between -
>
> Either *none* of the USB devices would come up on boot, or *one* of
> them would but not the other one.
>
> When they did not come up on boot, just unplugging it and replugging
> it would make it come up (i.e. on unplug there was no detach message
> in the dmesg, but on replug there would be a message saying it had
> been plugged in).
>
>
> I did not give any effort to understand the case of when only one of
> them would come up, *which* one of the two would. Possibly it could be
> the AXEN messing up things big time but I don't think so, I could try
> with two RTL8153:s only instead also.
>
> I was thinking for a second that possibly the reason that only one of
> them would come up, could be power consumption problems, but, this is
> a server-grade computer with strong power supplies, and these USB3
> ports are directly on the motherboard, so they should have proper
> power supply.
>
>
> Switching back to USB2 made them come up on boot as they should. And,
> switching on "USB Legacy Mode" (to "enabled", and for the sake of it
> also its "USB3 Legacy Mode" subsetting, to "enabled") also made the
> USB3 devices come up on every boot.
>
> I'm not aware of any console tools to power on/off the USB
> bus/hubs/devices, so I couldn't reduce further from within OpenBSD.
>
> Trying to analyze the problem a bit, I find the dmesg + usbdevs output
> a bit funny - the dmesg says the USB3 devices are on 'port 16 addr 4'
> and 'port 17 addr 5', while usbdevs mentions the port number for the
> first device only and not for the second device.
>
> What the motherboard manual
> ftp://europe.asrock.com/Manual/E3C226D2I.pdf says about the USB legacy
> settings (page 47) is quoted below, it's not instructive at all to me.
>
>
> So by this email I just wanted to report this peculiar behavior, and
> also ask if you think it's a bug or a feature.
>
> I guess actually I'll keep the "USB Legacy" feature on from now and on
> as AFAIK it's needed for booting off USB block devices which is handy
> sometimes, however it was a really strange side-effect that disabling
> it would make USB3 devices in particular not detect on boot.
>
>
> If you have any comments on if this is a bug or a feature or if "USB
> Legacy" is generally advisable to be on or off, would be happy to
> learn to know.
>
> Thanks,
> Tinker
>
>
> Motherboard manual excerpt:
> "Legacy USB Support: [options are Enabled, Disabled, Auto, and UEFI
> Setup Only]
> Enable or disable Legacy OS Support for USB 2.0 devices. If you
> encounter USB compatibility issues it is recommended to disable legacy
> USB support. Select UEFI Setup Only to support USB devices under the
> UEFI setup and Windows/Linux operating systems only.
>
> Legacy USB 3.0 Support: [options are Enabled and Disabled]
> Enable or disable Legacy OS Support for USB 3.0 devices."
>
> dmesg excerpt:
> axen0 at uhub0 port 16 configuration 1 interface 0 "ASIX Elec. Corp.
> AX88179" rev 3.00/1.00 addr 4
> axen0: AX88179, address 00:11:6b:SNIP
> rgephy0 at axen0 phy 3: RTL8169S/8110S/8211 PHY, rev. 5
> cdce0 at uhub0 port 17 configuration 2 interface 0 "Linksys Linksys
> USB3GIGV1" rev 3.00/30.00 addr 5
> cdce0: address 14:91:82:SNIP
>
> usbdevs -v:
> Controller /dev/usb0:
> addr 1: super speed, self powered, config 1, xHCI root hub(0x0000),
> Intel(0x8086), rev 1.00
> port 1 addr 2: high speed, self powered, config 1, Virtual
> Hub(0xff01), American Megatrends Inc.(0x046b), rev 1.00, iSerialNumber
> serial
> port 1 powered
> port 2 powered
> port 3 powered
> port 4 addr 3: low speed, self powered, config 1, Virtual Keyboard
> and Mouse(0xff10), American Megatrends Inc.(0x046b), rev 1.00
> port 5 powered
> port 2 disabled
> port 3 disabled
> port 4 disabled
> port 5 disabled
> port 6 disabled
> port 7 disabled
> port 8 disabled
> port 9 disabled
> port 10 disabled
> port 11 disabled
> port 12 disabled
> port 13 disabled
> port 14 disabled
> port 15 disabled
> port 16 addr 4: super speed, power 124 mA, config 1, AX88179(0x1790),
> ASIX Elec. Corp.(0x0b95), rev 1.00, iSerialNumber 000011SNIP
> addr 5: super speed, power 64 mA, config 2, Linksys USB3GIGV1(0x0041),
> Linksys(0x13b1), rev 30.00, iSerialNumber 000001000000
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