[Bug 90246] Switching from Xorg to fglrx-updates and back loses 1 monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90246

--- Comment #6 from Alex Deucher <alexdeucher at gmail.com> ---
The open radeon driver is not loaded.  You are ending up with with the vesa
driver which is a generic fallback driver.

[    0.497744] vesafb: mode is 1600x1200x32, linelength=6400, pages=0
[    0.497744] vesafb: scrolling: redraw
[    0.497746] vesafb: Truecolor: size=0:8:8:8, shift=0:16:8:0
[    0.497761] vesafb: framebuffer at 0xd0000000, mapped to 0xffffc90004800000,
using 7552k, total 7552k
[    0.497829] Console: switching to colour frame buffer device 200x75
[    0.497850] fb0: VESA VGA frame buffer device

Also, the fglrx kernel driver is still installed:

[   19.374964] fglrx: module license 'Proprietary. (C) 2002 - ATI Technologies,
Starnberg, GERMANY' taints kernel.
[   19.374967] Disabling lock debugging due to kernel taint
[   19.378341] fglrx: module verification failed: signature and/or  required
key missing - tainting kernel
[   19.387574] <6>[fglrx] Maximum main memory to use for locked dma buffers:
3747 MBytes.
[   19.387650] <6>[fglrx]   vendor: 1002 device: 68f9 revision: 0 count: 1
[   19.387815] <6>[fglrx] ioport: bar 4, base 0x3000, size: 0x100
[   19.387980] <6>[fglrx] Kernel PAT support is enabled
[   19.387991] <6>[fglrx] module loaded - fglrx 15.20.2 [Feb 27 2015] with 1
minors

Which is probably means the radeon driver is blacklisted so it's not loading. 
You need to fully remove the fglrx driver.

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