Comment 40 for bug 754799

Revision history for this message
In , Daniel Manrique (roadmr) wrote :

(In reply to comment #9)
> Daniel, if you do get a chance can you grab an intel_reg_dumper with the old
> and new BIOSes.
>
> At this point we want to find out what state the BIOS left the registers in
> that caused us to fail.

Thanks Chris, I'll attach two text files, one showing the registers after the system has booted, and another one with the registers post-suspend. I diffed the files and here's what changed (- is pre-suspend, + is post-suspend):

- PCH_DREF_CONTROL: 0x00001402 (cpu source disable, ssc_source enable, nonspread_source enable, superspread_source disable, ssc4_mode downspread, ssc1 enable, ssc4 disable)
+ PCH_DREF_CONTROL: 0x00001400 (cpu source disable, ssc_source enable, nonspread_source enable, superspread_source disable, ssc4_mode downspread, ssc1 disable, ssc4 disable)

- HDMIB: 0x0000089c
+ HDMIB: 0x0000001c

I'll try to downgrade the bios to reproduce the original problem and collect the same information with that, though I'm not sure that I'll be able to do so :( If so, I'll report back here.

Thanks so much for following up on this report!