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. (@$#!ยง*) > > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
