Hi All,
I am using a baytrail cpu and linux kernel 3.14.7, and will echo some message to /dev/tty1 during boot.
There is chance that no display output during boot, but I can use linux via ttyS4, the HSUART.
Attached is output of intel_reg_dumper,
display.fail is register dump that no display output.
display_ok is register dump that display works.
There is difference between:
DPLL_A_MD: 0x60ff2cdf (ok)
DPLL_A_MD: 0x70ff2ddf (fail)
DPLL_B: 0x60ff2cdf (disabled, dvo, VGA, TV A clock, unknown mode, p1 = 1, p2 = 0) (ok)
DPLL_B: 0x70ff2ddf (disabled, dvo, TV A clock, unknown mode, p1 = 1, p2 = 0, using FPx1!) (fail)
The bios dump is also attached. How do I read the bios dump file?
The problem can be reproduced even I update kernel to 3.14.18.
It's interesting the no display issue never happens if I boot into x-window system.
Attachment:
display.fail
Description: Binary data
Attachment:
display_ok
Description: Binary data
Attachment:
bios.fail
Description: Binary data
Attachment:
bios.ok
Description: Binary data
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