[Bug 10418] Powerbook DVI out only works when booted with monitor attached

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=10418





------- Comment #47 from hvr at gnu.org  2007-10-21 01:49 PST -------
(In reply to comment #42)
> For the record the registers on my external tdms look like this:

> SIL164_VID_LO (0x0):    0x01
> SIL164_VID_HI (0x1):    0x00
> SIL164_DID_LO (0x2):    0x06
> SIL164_DID_HI (0x3):    0x00
> SIL164_REV (0x4):       0x00
> SIL164_RSVD (0x5):      0x00

the regs above seem to be the same across multiple silicon image dvi
transmitter chips... makes one wonder why they keep the use the same DID/REV
for different devices...

> SIL164_FREQ_LO (0x6):   0x14
> SIL164_FREQ_HI (0x7):   0xc8

the 2 read-only registers above on the other hand seem to different on
different  tdms chips... e.g.:

according to datasheets,

 a sil164 should have 0x19/0x64 for lo/hi (meaning 25MHz and 165MHz); 
 a sil1178 should have 0x19/0xa5 for lo/hi (meaning 25MHz and 165MHz again);

my tdms seems to be similiar to a sil1178

yours on the other hand looks neither like a sil164 nor a sil1178... (maybe
someone has the missing sil-datasheets?), and it seems your tdms might support
a pixelclock frequency range from 20MHz up to 200MHz...

> SIL164_REG8 (0x8):      0x3b
> SIL164_REG9 (0x9):      0x00
> SIL164_REGC (0xc):      0x89

well, that looks already initialized by OF or xorg... 


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