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Red Hat Bugzilla – Attachment 601571 Details for
Bug 765954
EFI boot failure to properly initialize graphics on Macs with Intel and AMD graphics (MacBookPro 8,2 and 8,3
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compile to turn off discrete gpu after resume
igd.c (text/x-csrc), 583 bytes, created by
Ben Pierce
on 2012-07-31 19:42:05 UTC
(
hide
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Description:
compile to turn off discrete gpu after resume
Filename:
MIME Type:
Creator:
Ben Pierce
Created:
2012-07-31 19:42:05 UTC
Size:
583 bytes
patch
obsolete
>#include <stdio.h> >#include <sys/io.h> > >#define PORT_SWITCH_DISPLAY 0x710 >#define PORT_SWITCH_SELECT 0x728 >#define PORT_SWITCH_DDC 0x740 >#define PORT_DISCRETE_POWER 0x750 > >static int gmux_switch_to_igd() >{ > outb(1, PORT_SWITCH_SELECT); > outb(2, PORT_SWITCH_DISPLAY); > outb(2, PORT_SWITCH_DDC); > return 0; >} > >static void mbp_gpu_power(int state) >{ > outb(state, PORT_DISCRETE_POWER); >} > >int main(int argc, char **argv) >{ > if (iopl(3) < 0) { > perror ("No IO permissions"); > return 1; > } > mbp_gpu_power(0); > gmux_switch_to_igd(); > return 0; >}
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