Target Display Mode: send_byte(0x52, 0x0300) fail: 0x40
Doofus100500 opened this issue · 3 comments
Doofus100500 commented
iMac 27-Inch, late 2012 (iMac13,2)
Hi, everything was build without errors, using original cable. But after booting i see only command prompt.
sudo /usr/bin/tdm_toggle
Target Display Mode : send_byte(0x52, 0x0300) fail: 0x40
MVHR: read arg fail
read_smc get_key_type error
enabled, toggling OFF ...
Target Display Mode : send_byte(0x52, 0x0300) fail: 0x40
MVHR: read arg fail
read_smc get_key_type error
send_byte(0x52, 0x0300) fail: 0x40
MVHR: read arg fail
read_smc get_key_type error
disabled.
gpdm commented
Known issue, this was as well reported in upstream project, see floe/smc_util#2
I have currently no solution to this particular error.
Bellavene commented
Unfortunately, 2012 iMacs are using Thunderbolt instead of miniDP, that's why it doesn't work. And TDM on Thunderbolt macs is working only with Thunderbolt macs, M series macs are out of luck too.
dbarrington commented
I also tried this, and the same for me unfortunately. I am happy to test/debug/provide output if anyone wants to look further at this issue.