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Bug #32
closed[Haswell/Broadwell] LPC power optimizer RCBA instructions break eDP display with Intel VBIOS
Status:
Closed
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
Start date:
02/06/2016
Due date:
% Done:
0%
Estimated time:
Affected versions:
Needs backport to:
Affected hardware:
Affected OS:
Description
With the Intel VBIOS other than version 2070 run by SeaBIOS, or with Windows's Intel HD Graphics driver, an LPC power optimizer setting breaks eDP on Haswell/Broadwell.
Affected Haswell code: https://github.com/coreboot/coreboot/blob/master/src/southbridge/intel/lynxpoint/lpc.c#L349
Affected Broadwell code: https://github.com/coreboot/coreboot/blob/master/src/soc/intel/broadwell/lpc.c#L285
Removing the power optimizer lines fixes eDP display on Haswell/Broadwell.
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