[Bug 85421] xf86-video-ati has flawed drawing straight lines operation

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85421

--- Comment #2 from Zbigniew <zb at jabster.pl> ---
Not sure, do you know the comments of someone other; the comments seem to be
related, and may be helpful in tracing the problem:

http://www.flaterco.com/kb/video/X-regressions.html

======= quote ==================
As of 2013-08-29, kernel 3.10.10, Slackware 14.0:  It's impossible to get 2D
and 3D acceleration working at the same time.  All permutations of drivers have
a problem with the screen going black (no signal) until the next reboot about
50% of the time when modesetting occurs.
CONFIG_DRM=y, CONFIG_DRM_RADEON=n:  There is no DRI or GL, but XAA 2D
acceleration works great.
CONFIG_DRM_RADEON=y, CONFIG_DRM_RADEON_UMS=n, CONFIG_FB_RADEON=n:  Now there's
DRI2 and GL but 2D acceleration is broken.  XAA and EXA claim to be enabled,
but 2D is sloooow and Option "MigrationHeuristic" "greedy" does nothing.
CONFIG_FB_RADEON=y makes 2D fast again but it disables DRI and DRI2.
CONFIG_DRM_RADEON_UMS=y causes the screen to go black every time.

With option 2 (DRI2), background or sky textures are missing in EDuke32 and
there is flakiness in PrBoom-Plus.  Reverting Mesa to 7.11.2 with DRI drivers
only or setting Option "DRI2" "false" in xorg.conf makes no difference.

2014-09-02, kernel 3.16.1, Slackware 14.1:  The modesetting BSOD problem is
still there and I can't stand it for long enough to test anything else.

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