Issue #475 has been updated by Bill XIE.

Assignee changed from Arthur Heymans to Bill XIE
% Done changed from 0 to 90
Related links updated

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Bug #475: mainboard_vbt_filename() in src/mainboard/lenovo/x200/blc.c does not 
work as intended
https://ticket.coreboot.org/issues/475#change-1463

* Author: Bill XIE
* Status: New
* Priority: Normal
* Assignee: Bill XIE
* Category: board support
* Target version: master
* Start date: 2023-03-30
* Affected versions: 4.15, 4.16, 4.17, 4.18, 4.19, master
* Related links: This is going to be fixed with 
https://review.coreboot.org/c/coreboot/+/74181 .
* Affected hardware: x200
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Date back to coreboot 4.9, mainboard_vbt_filename() in 
src/mainboard/lenovo/x200/blc.c calls  get_blc_pwm_freq_value(NULL), making the 
following if condition always falling to the first, not to mention null 
dereference on strcmp() in get_blc_pwm_freq_value().

In order to determine the correct vbt filename at runtime, edid ascii string 
should be obtained first.

This issue may be distantly related to #474.



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