Slackware 14.0 on Thinkpad Edge with AMD processor and AMD/ATI graphics. lspci tells me that the graphics adapter is a Mobility Radeon HD4200 series device. I downloaded the appropriate amd driver from their website by mkaing explicit choices for this device.
X works fine with the Xorg radeon driver except that the HDMI port provides video but no audio. I thought that using the catalyst driver might solve this annoyance and followed the very clear instructions here: http://docs.slackware.com/howtos:hardwareroprietary_graphics_drivers
All seemed to work - ie the fglrx slackware package got built, I installed that package and ran the
command which generated an xorg.conf file containing references to the new display driver. I blacklisted the Xorg modules as advised.
However on re-starting the PC "startx" kills everything. Black screen, dead keyboard, dead mouse. Only the power button restores sanity.
I have reverted to the Xorg drivers and all is working fine again - but can anybody suggest what trick I may be missing?