Opening new bug as requested in IRC
Created attachment 14419 [details] radeontool regs output WITH randr12
Created attachment 14420 [details] radeontool regs output WITHOUT randr12
Created attachment 14645 [details] [review] Hardcode some regs to match working state See what effect this has. If it has a detrimental effect, it's worth trying applying parts of it to see what causes the problem, and if any other parts improve things. If it has a good effect, try to find which change causes it.
Created attachment 14666 [details] Xorg.log with patch No visible changes. The screen is still 'striped', only every second vertical line is visible, the effect carries over to vga virtual terminals. Only a reboot restores the image. (nv or randr12 less nouveau cannot remove the effect)
Created attachment 14667 [details] radeontools regs dump with randr12 + patch
An randr12 and non-randr12 comparison of: ./radeontool regset 0x6808b0 0x10004 ./radeontool regmatch 0x6808b4 ./radeontool regset 0x6808b8 0x10004 ./radeontool regmatch 0x6808bc ./radeontool regset 0x6828b0 0x10004 ./radeontool regmatch 0x6828b4 ./radeontool regset 0x6828b8 0x10004 ./radeontool regmatch 0x6828bc might be interesting - the fact that the effect isn't cured on exit to console indicates the digital output setup is wrong :(
With the current git, the randr1.2 code now sets a correct mode. Whatever you did, appears to fix it. :p
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