Hi all, Days ago the coreboot port for Thinkpad X230s ( https://review.coreboot.org/c/coreboot/+/41390 ) for one of my friends got merged. Most stuffs on this laptop proves to work fine, but the interaction between its EC and cellular modem installed in its internal M.2 socket is detected to be a bit weird, and because of this the cellular modem installed internally becomes hardly usable:
If the laptop is connected to AC power, the cellular modem is disabled and cannot be enabled with software. (e.g. Modem manager ) as if there were a hardware switch set to flight mode; if the AC power is absent, whether the cellular modem is usable depends on the operating system.
The detailed testing result table collected by my friend is attached, in html format.
The direct cause of this phenomenon may be that the EC erroneously pull down the GPIO pin for rfkill (Pin 8 of the M.2 socket with key B) when the AC power gets present, but I cannot confirm whether the main board of this X230s is faulty, or the EC firmware is buggy, or the EC of X230s should be treated differently as the EC of X230, which I did not implement in my work.
Currently, this problem is walked around by blocking the Pin with a small piece of insulating tape.
Since I have experienced only one X230s, I cannot tell which one is the real case. Could ye help me to confirm and/or improve this if ye have a chance to access your own Thinkpad X230s?
Regards, Persmule
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Angel Pons -
Persmule