TP X220 suppose to have a UEFI compatible BIOS, is it possible it has a UEFI DXE VGA driver (not sure what's the proper name of it) except a legacy video?
Maybe you should boot up system with original BIOS and check the content in 0xC000 segment, is it a legacy VBIOS or it's empty... On Mon, Mar 30, 2015 at 7:10 PM, Charles Devereaux <[email protected]> wrote: > Likewise on thinkpad tablets the name of the digitizer (WACF004) can be > changed by the ACPI DSDT depending on things detected by the BIOS or not. > > You may want to check the DSDT > > On Mon, Mar 30, 2015 at 12:29 PM, Timothy Pearson < > [email protected]> wrote: > >> On 03/30/2015 11:24 AM, Iru Cai wrote: >> >>> Hi, >>> >>> I'm trying to build Coreboot for ThinkPad X220. I first backup the >>> vendor BIOS, then use UEFITool to extract a VBIOS. The romheader program >>> detects the ROM's PCI data structure and reports the device id is >>> 8086:0106, but the VGA controller's device id is 8086:0126. I extracted >>> the video ROM from a running X220 memory and use romheader to test it, >>> the result is still 8086:0106. How could this happen? >>> >>> Iru >>> >>> >> Some PCI devices can change their device ID based on a configuration >> register or two (I know the XGI Volari can do this for instance). It is >> possible that the proprietary BIOS changes the ID for some reason. >> >> -- >> Timothy Pearson >> Raptor Engineering >> +1 (415) 727-8645 >> http://www.raptorengineeringinc.com >> >> -- >> coreboot mailing list: [email protected] >> http://www.coreboot.org/mailman/listinfo/coreboot >> > > > -- > coreboot mailing list: [email protected] > http://www.coreboot.org/mailman/listinfo/coreboot >
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