Re: PROBLEM: lsusb -v freezes kernel on Acer ES1-111M

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On Fri, 25 Sep 2015, Roland Weber wrote:

> Hi Alan,
> 
> > (I still think it's the BIOS's fault.)
> 
> You're spot on, and the keyboard doesn't have enough special characters
> to express my feelings. (@$#!§*)
> 
> I created a bootable USB stick with the Xubuntu 15.04 installer.
> When booting in legacy BIOS mode...
> 
> > lspci
> 00:00.0 Host bridge: Intel Corporation Atom Processor Z36xxx/Z37xxx Series SoC Transaction Register (rev 0e)
> 00:02.0 VGA compatible controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display (rev 0e)
> 00:12.0 SD Host controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series SDIO Controller (rev 0e)
> 00:14.0 USB controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series USB xHCI (rev 0e)
> 00:17.0 SD Host controller: Intel Corporation Device 0f50 (rev 0e)
> 00:1a.0 Encryption controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Trusted Execution Engine (rev 0e)
> 00:1b.0 Audio device: Intel Corporation Atom Processor Z36xxx/Z37xxx Series High Definition Audio Controller (rev 0e)
> 00:1c.0 PCI bridge: Intel Corporation Device 0f48 (rev 0e)
> 00:1c.1 PCI bridge: Intel Corporation Device 0f4a (rev 0e)
> 00:1c.2 PCI bridge: Intel Corporation Device 0f4c (rev 0e)
> 00:1d.0 USB controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series USB EHCI (rev 0e)
> 00:1f.0 ISA bridge: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Power Control Unit (rev 0e)
> 00:1f.3 SMBus: Intel Corporation Device 0f12 (rev 0e)
> 02:00.0 Network controller: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter (rev 01)
> 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)
> 
> and the machine freezes.
> When booting in UEFI mode (insecure)...
> 
> > lspci
> 00:00.0 Host bridge: Intel Corporation Atom Processor Z36xxx/Z37xxx Series SoC Transaction Register (rev 0e)
> 00:02.0 VGA compatible controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display (rev 0e)
> 00:14.0 USB controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series USB xHCI (rev 0e)
> 00:1a.0 Encryption controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Trusted Execution Engine (rev 0e)
> 00:1b.0 Audio device: Intel Corporation Atom Processor Z36xxx/Z37xxx Series High Definition Audio Controller (rev 0e)
> 00:1c.0 PCI bridge: Intel Corporation Device 0f48 (rev 0e)
> 00:1c.1 PCI bridge: Intel Corporation Device 0f4a (rev 0e)
> 00:1c.2 PCI bridge: Intel Corporation Device 0f4c (rev 0e)
> 00:1f.0 ISA bridge: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Power Control Unit (rev 0e)
> 00:1f.3 SMBus: Intel Corporation Device 0f12 (rev 0e)
> 02:00.0 Network controller: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter (rev 01)
> 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)
> 
> and the machine does not freeze. The device 00:1d.0 which caused my problem
> has simply vanished, along with 00:12.0 and 00:17.0. Apparently, there's
> some unused hardware in the machine and Acer decided to hide it from the OS
> in UEFI mode, but didn't bother to do the same in legacy BIOS mode. Or maybe
> BIOS doesn't support such behavior.

Amazing!

> I'll try the upcoming re-installation in UEFI mode. And if it goes as I hope,
> I won't be able to trigger the freeze anymore. It'd be kind of an unsatisfactory
> ending to a months-long wild goose chase. But the simplest solution might
> turn out to be telling people not to use legacy BIOS mode on this machine.
> 
> I'll wait with the installation until Sunday morning, just in case you or
> somebody else would like me to gather some more information in BIOS mode.
> And of course I'll report the outcome of the installation.

Okay.  I don't have any other requests for now.

> thanks for all your efforts,

You're the one who did all the work.  Go ahead and pat yourself on the 
back.  :-)

Alan Stern

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