[Intel-gfx] [PROBLEM FOUND] Problem No HDMI when AV/TV in standby mode

paulo louro paulo_louro at msn.com
Tue Jan 24 21:38:57 CET 2012

Hello all,
I think i have found why there is a problem with my Onkyo AV when the TV/AV are in standby mode.
I run the following test.
Boot PC with AV/TV in standby and dump intel registers to a file TEST1Boot PC with AV/TV on and dump intel register to file TEST2Using the diff to find the difference between both files i found the following:
root at SERVER:~# diff test1 test214c14<                      PIPEACONF: 0xc0200000 (enabled, active, 8bpc)--->                      PIPEACONF: 0xc0000000 (enabled, active, 8bpc)21c21<                   VSYNCSHIFT_A: 0x0000038c--->                   VSYNCSHIFT_A: 0x00000000125c125<                     TRANSACONF: 0xc0600000 (enable, active)--->                     TRANSACONF: 0xc0000000 (enable, active)
So register PIPEACONF, VSYNCSHIFT_A and TRANSACONF are different. By checking intel documentation i found that this registers are responsibly for setting up the progressive/interleave mode. As so im thinking that this registers are not being reinitialize or cleaned. 
Is this possible? 
Since im up for one more test i used intel_reg_read/write to modified the registers and correct the values, to my surprise after writing to all the register the AV shows my desktop correctly.
My other question is if they need to be reinitialized where in the code shall this be done? I'm up for writing a small patch to fix this issue, just need some one to point me on the right direction.
Thanks--Paulo Louro

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