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path: root/drivers/usb/image/Kconfig
blob: 320d368c8dace716b9f6e4a52085efba50d552bd (plain)
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#
# USB Imaging devices configuration
#
comment "USB Imaging devices"

config USB_MDC800
	tristate "USB Mustek MDC800 Digital Camera support"
	---help---
	  Say Y here if you want to connect this type of still camera to
	  your computer's USB port. This driver can be used with gphoto 0.4.3
	  and higher (look at <http://www.gphoto.org/>).
	  To use it create a device node with "mknod /dev/mustek c 180 32" and
	  configure it in your software.

	  To compile this driver as a module, choose M here: the
	  module will be called mdc800.

config USB_MICROTEK
	tristate "Microtek X6USB scanner support"
	depends on SCSI
	help
	  Say Y here if you want support for the Microtek X6USB and
	  possibly the Phantom 336CX, Phantom C6 and ScanMaker V6U(S)L.
	  Support for anything but the X6 is experimental.
	  Please report failures and successes.
	  The scanner will appear as a scsi generic device to the rest
	  of the system. Scsi support is required.
	  This driver can be compiled as a module, called microtek.
next.git/commit/tools/perf/pmu-events/arch/x86/broadwellde/memory.json?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>6e978b22efa1db9f6e71b24440b5f1d93e968ee3 (patch) treec666f7a26b860674848949e39a610222b0723f89 /tools/perf/pmu-events/arch/x86/broadwellde/memory.json parent3c223c19aea85d3dda1416c187915f4a30b04b1f (diff)
cpufreq: intel_pstate: Disable energy efficiency optimization
Some Kabylake desktop processors may not reach max turbo when running in HWP mode, even if running under sustained 100% utilization. This occurs when the HWP.EPP (Energy Performance Preference) is set to "balance_power" (0x80) -- the default on most systems. It occurs because the platform BIOS may erroneously enable an energy-efficiency setting -- MSR_IA32_POWER_CTL BIT-EE, which is not recommended to be enabled on this SKU. On the failing systems, this BIOS issue was not discovered when the desktop motherboard was tested with Windows, because the BIOS also neglects to provide the ACPI/CPPC table, that Windows requires to enable HWP, and so Windows runs in legacy P-state mode, where this setting has no effect. Linux' intel_pstate driver does not require ACPI/CPPC to enable HWP, and so it runs in HWP mode, exposing this incorrect BIOS configuration. There are several ways to address this problem. First, Linux can also run in legacy P-state mode on this system. As intel_pstate is how Linux enables HWP, booting with "intel_pstate=disable" will run in acpi-cpufreq/ondemand legacy p-state mode. Or second, the "performance" governor can be used with intel_pstate, which will modify HWP.EPP to 0. Or third, starting in 4.10, the /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference attribute in can be updated from "balance_power" to "performance". Or fourth, apply this patch, which fixes the erroneous setting of MSR_IA32_POWER_CTL BIT_EE on this model, allowing the default configuration to function as designed. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by: Len Brown <len.brown@intel.com> Cc: 4.6+ <stable@vger.kernel.org> # 4.6+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'tools/perf/pmu-events/arch/x86/broadwellde/memory.json')