[Bug 18564] DVI display detected, but won't turn on (tried latest git)

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Jan 1 17:20:38 PST 2009


--- Comment #7 from Tyson Whitehead <twhitehead at gmail.com>  2009-01-01 17:20:38 PST ---
By comparing dumps of the register file over many reboots with different
configurations, I've managed to figure out that I can enable my external DVI
display plugged into the HDMI port on my laptop by either doing

xrandr --output DVI-0 --auto
rhd_dump -w 0x7880 0x10001001  01:00.0
rhd_dump -w 0x7904 0x00001F00  01:00.0

(i.e., enable it and then write 0x10001001 to the TMDSA_CNTL register followed
by 0x00001F00 to the TMDSA_TRANSMITTER_ENABLE register) or

xrandr --output HDMI-0 --auto
rhd_dump -w 0x7880 0x10001001  01:00.0
rhd_dump -w 0x7904 0x00001F00  01:00.0
rhd_dump -w 0x7910 0x00000031  01:00.0
rhd_dump -w 0x7884 0x00000001  01:00.0

(i.e., also write 0x10001001 to the TMDSA_TRANSMITTER_CONTROL register followed
by 0x00000001 to the TMDSA_SOURCE_SELECT register).

I'll attach my register file analysis.

Hope this helps!  -Tyson

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