Could you try to track down what in radeon_video.c causes this ? Just comment out (with #if 0 .. #endif) arbitrary chunks of code until you zero in on whatever causes the lockup.
I started with fi1236:
I found that I2C_WriteRead() in Detect_FI1236() causes the problems, the computer doesn't lock up I can still poweroff but the screen is blank.
Thank you very much for tracking this down :)
Could you tell me (perhaps again) what kind of card you have (does it have a VIVO port, etc) and e-mail me (off the list) /var/log/Xorg.0.log obtained with I2C_WriteRead() disabled by putting #if 0 .. #endif around entire body (add a return to say its failed).
thank you !
Vladimir Dergachev
Rune Petersen
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