From 0f2025da0fd4dce6b951b4c4b97c9370ca7d66db Mon Sep 17 00:00:00 2001 From: Prabal Saha Date: Sat, 18 Jun 2016 20:47:21 -0700 Subject: intel/lynxpoint,broadwell: Fix eDP display in Windows, SeaBios & Tiano Without this patch, eDP output is non-functional pre-graphics driver regardless of payload (SeaBIOS, Tianocore) or video init method (VBIOS, GOP driver) and once the standard Windows Intel HD graphics driver is loaded. Test: Boot Windows on peppy and auron_paine, install Intel HD Graphics driver, observe functional eDP output with full video acceleration. Debugging method: adjust location of call to run VBIOS within coreboot, observed that eDP output functional if the VBIOS is run before the power optimizer lines, broken if run afterwards. Change-Id: I6d8252e3de396887c84533e355f41693b9ea7514 Signed-off-by: Prabal Saha Reviewed-on: https://review.coreboot.org/15261 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth --- src/southbridge/intel/lynxpoint/Kconfig | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'src/southbridge/intel/lynxpoint/Kconfig') diff --git a/src/southbridge/intel/lynxpoint/Kconfig b/src/southbridge/intel/lynxpoint/Kconfig index eea0c01043..7615e69cc3 100644 --- a/src/southbridge/intel/lynxpoint/Kconfig +++ b/src/southbridge/intel/lynxpoint/Kconfig @@ -96,4 +96,13 @@ config LOCK_MANAGEMENT_ENGINE bool default n +config LYNXPOINT_POWER_OPTIMIZER + bool "Enable Power Optimizer" + default y if CHROMEOS + help + Enable the power optimizer for the High Speed I/O + Power Control (HSIOPC). This can break graphics + under Windows, but can improve battery life under + 'mostly idle' conditions. + endif -- cgit v1.2.3