M4800 : Optimus (switchable graphics) turns off at every restart, shutdown..

[weiser7]

Hi.

 

Spec of my M4800

 

i7-4610M

HD4600 + Quadro K2100M (eDP!!!!!)

and etc.. oh, bios is A16.

 

I could install el capitan with your guide (without dsdt). I used nv_disable=1 flag.. as you know qe/ci of k2100m + edp combination doesn't work.

 

So I patched config ang kext for hd4600 and it worked... just for one time.

 

After restart (or shutdown), bios turns off 'Enable Switchable Graphics' option automatically, so hd 4600 goes away & only k2100m lefts (and not working)..

 

I'd like to know how to fix this.

[ss2sameer]

Hi

I have el captain installed on Dell M7510 and facing the same problem. did u solve the problem

[Bronxteck]

you probably need to use RTC fix in clover if that is what your using. or fix rtc acpi patch

[ss2sameer]

RTC fix in clover is already there.

[Timp74]

This sounds like the same problem I had with an M6700 with NVidia graphics.  Basically the CMOS seemed to get corrupt on sleep with the NVidia card installed(and optimus disable in the BIOS?! I think).  None of the AppleRTC patches or DSDT changes I tried helped.  I ended up swapping the card for the AMD option.  Apart from the initial hassle with connector personalities it's all good.  Been working great for the last couple of years.  I tried to document some of the problems here: http://www.insanelymac.com/forum/topic/286953-dell-precision-m6700-osx-installation/

 

Would be great to have a solution to this problem.

[howoarang]

Disable (Uncheck) the Switchable graphics option in BIOS and will be lucky!

 

See on my post #17 here