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Acer C720 ML Laptop a work in progress.

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hawk.john

hawk.john

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Actions already complete:

Enabling Developer Mode
Warning: This will wipe all of your data!


To enter developer mode:
Press and hold the Esc+F3(Refresh) keys, then press the Power button.
This enters recovery mode.
Now, press Ctrl+D (no prompt). It will ask you to confirm, then the system will revert its state and enable developer mode.
Press Ctrl+D (or wait 30 seconds for the beep and boot) at the white boot splash screen to enter Chrome OS

Enabling Legacy Boot Mode

Press Ctrl+D (or wait 30 seconds for the beep and boot) at the white boot splash screen to enter Chrome OS
Open a crosh window with Ctrl+Alt+T.
Open a bash shell with the shell command.
# shell
Become superuser with sudo bash
# sudo bash
Enable legacy boot with:
# crossystem dev_boot_usb=1 dev_boot_legacy=1


Reboot computer or press the Power button.


To verify legacy boot is active at the white boot splash screen hit Tab:
dev_boot_usb: 1 Default:0
dev_boot_legacy: 1 Default:0
dev_boot_signed_only: 0 Default:0


At the white boot splash screen hit Ctrl+L to boot legacy.


Note: hit escape quickly to get boot menu
usb hub works if needed (powered)


Acer C720 lspci -nn output from linux console:


00:00.0 Host bridge [0600]: Intel Corporation Haswell-ULT DRAM Controller [8086:0a04] (rev 09)
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a06] (rev 09)
00:03.0 Audio device [0403]: Intel Corporation Device [8086:0a0c] (rev 09)
00:14.0 USB controller [0c03]: Intel Corporation Lynx Point-LP USB xHCI HC [8086:9c31] (rev 04)
00:15.0 DMA controller [0801]: Intel Corporation Lynx Point-LP Low Power Sub-System DMA [8086:9c60] (rev 04)
00:15.1 Serial bus controller [0c80]: Intel Corporation Lynx Point-LP I2C Controller #0 [8086:9c61] (rev 04)
00:15.2 Serial bus controller [0c80]: Intel Corporation Lynx Point-LP I2C Controller #1 [8086:9c62] (rev 04)
00:1b.0 Audio device [0403]: Intel Corporation Lynx Point-LP HD Audio Controller [8086:9c20] (rev 04)
00:1c.0 PCI bridge [0604]: Intel Corporation Lynx Point-LP PCI Express Root Port 1 [8086:9c10] (rev e4)
00:1f.0 ISA bridge [0601]: Intel Corporation Lynx Point-LP LPC Controller [8086:9c45] (rev 04)
00:1f.2 SATA controller [0106]: Intel Corporation Lynx Point-LP SATA Controller 1 [AHCI mode] [8086:9c03] (rev 04)
00:1f.3 SMBus [0c05]: Intel Corporation Lynx Point-LP SMBus Controller [8086:9c22] (rev 04)
00:1f.6 Signal processing controller [1180]: Intel Corporation Lynx Point-LP Thermal [8086:9c24] (rev 04)
01:00.0 Network controller [0280]: Qualcomm Atheros AR9462 Wireless Network Adapter [168c:0034] (rev 01)
Note: This is with the original Chrome OS Kernel running in Crouton.


Created unibeast with Mavericks to Install Mavericka on Acer c720

Despite attempting: GraphicsEnabler=Yes IGPEnabler=No PCIRootUID=0/1 -x -v "Graphics Mode"="1366x768x32"

To date i have not been able to get to install screen.

All help accepted!

jhawk
 
Acer C720 Mavericks Laptop a work in progress.

hawk.john said:
...
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a06] (rev 09)

...
Created unibeast with Mavericks to Install Mavericka on Acer c720

Despite attempting: GraphicsEnabler=Yes IGPEnabler=No PCIRootUID=0/1 -x -v "Graphics Mode"="1366x768x32"
Click to expand...

The device-id 8086:0a06 is not recognized by AppleIntelFramebufferCapri. You could try to change the device-id with a DSDT patch such as the one that follows:
Code: 
into method label _DSM parent_adr 0x00020000 remove_entry;
into device name_adr 0x00020000 insert
begin
Method (_DSM, 4, NotSerialized)\n
{\n
    If (LEqual (Arg2, Zero)) { Return (Buffer() { 0x03 } ) }\n
    Return (Package()\n
    {\n
        "device-id", Buffer() { 0x16, 0x0a, 0x00, 0x00 },\n
        "AAPL,ig-platform-id", Buffer() { 0x06, 0x00, 0x26, 0x0a },\n
    })\n
}\n
end;

But I don't think it is going to work. Your chip also doesn't have an Intel MEI device, which is going to cause the drivers to hang as well.

Can you replace the CPU?
 
Acer C720 Mavericks Laptop a work in progress.

Would Mountain Lion have same problem? Alternate Version?

Jhawk
 
Acer C720 Mavericks Laptop a work in progress.

hawk.john said:
Would Mountain Lion have same problem? Alternate Version?

Jhawk
Click to expand...

All versions of OS X supporting Haswell (only ML 10.8.5 and 10.9.x) would have the same issue.
 
Acer C720 Mavericks Laptop a work in progress.

The DSDT patch fails in Mavericks as expected. However. failure of same in 10.8.3 was unexpected.
Should I have used an alternate patch for the Intel® Celeron® 2955U processor in 10.8.3?

jhawk
 
Acer C720 Mavericks Laptop a work in progress.

hawk.john said:
The DSDT patch fails in Mavericks as expected. However. failure of same in 10.8.3 was unexpected.
Should I have used an alternate patch for the Intel® Celeron® 2955U processor in 10.8.3?

jhawk
Click to expand...

Well, prior to 10.8.5, there is no support for Haswell at all.
 
Acer C720 Mavericks Laptop a work in progress.

Still working on this was able to get to reboot post 1st install phase. However, on reboot the issue of cpu id returns...

jhawk
 
Acer C720 Mavericks Laptop a work in progress.

As I type I am on Max Os X 10.8.5 on my Acer C720 still a long road to go .......
Mavericks via 10.8.5 fails to upgrade it only copies "OS X Install Data" folder
but fails on reboot. This is probably a direct result of a non direct reboot since
I need to use legacy and select disk and use bootloader. Still working on it!
 
Acer C720 Mavericks Laptop a work in progress.

hawk.john said:
As I type I am on Max Os X 10.8.5 on my Acer C720 still a long road to go .......
Mavericks via 10.8.5 fails to upgrade it only copies "OS X Install Data" folder
but fails on reboot. This is probably a direct result of a non direct reboot since
I need to use legacy and select disk and use bootloader. Still working on it!
Click to expand...

What kind of upgrade are you trying to do? You can upgrade to Mavericks only by creating a USB installer with Unibeast and installing just like you installed ML.
 
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