[Bug 94171] ati multihead black on one output

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=94171

--- Comment #2 from Felix Miata <mrmazda at earthlink.net> ---
Using the HD from the comment 0 system with the same cedar PCIe card installed
in a slightly older P965 system , which has no onboard Intel gfx, both VGA-0
and DVI-0 outputs remain functional in X also with Mageia 4's kernel 3.14.32,
as well as with all installations reported in comment 0, just as when using
x600. IOW, no failures of x600 or cedar in the P965 system regardless of
kernel.

Using the same x1300 in the P965 however, DVI-0 in X is always black and VGA-0
in X always works, in the installations using kernels newer than 3.14.32.

I subsequently retested the comment 0 system with the 2 of the same 3 ATI
cards, but using a HD cloned from the original. Instead of using the same rv370
x600 of the original 3 I used an rv380 x600. Only the x1300 failed to produce X
output on DVI-0, and only with kernels newer than 3.14.2, matching the behavior
of the P965 system with all 3 ATI cards.

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