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Manuel, thanks for your detailed reply, too late for me now but I will follow your indications and redo the tests tomorrow.<BR>
<BR>
In fact, quite all the strange things you noticed are coming from the following:<BR>
<BR>
1. I installed RHEL 7 on a new disk (removing temporarily the old one) because I was not able to make RHEL7's installation process into a free partition to succeed, that is to be bootable.<BR>
(the installation process also messed up my previous RHEL 6 boot).<BR>
<BR>
2. Finally I was able to add again the old disk, and with a grub2-mkconfig to boot again the old RHEL 6.<BR>
<BR>
3. Than, being much too confident, I installed the AMD driver and lost my Xserver at first reboot. I was not able to restore the "before amd's fglrx" state, and had to re-install.<BR>
<BR>
4. I didn't want to replay this again and again, so since I had an other unused partition, I rsync(ed) the RHEL 7 into it and replayed grub2-mkconfig to get a second bootable (and mess-able) RHEL 7.<BR>
<BR>
<BR>
And as you found out, the "first level" second RHEL 7 boot menu entry (the one I used for the test) is not the "updated one", so I will cleanup this in grub.cfg<BR>
( kernel 3.10.0-327.10.1.el7.x86_64 ) before doing the next tests.<BR>
<BR>
About the "real AMD hardware" in my machine, the 4 elements of information at my disposal are:<BR>
<BR>
1. the bill who says "AMD FirePro M6100 with 2GB GDDR5"<BR>
2. the fact that AMD's amd-driver-installer-15.20.1046-x86.x86_64.zip works on RHEL 6.<BR>
3. the lspci of RHEL 6: it says (also):<BR>
<BR>
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Saturn XT [FirePro M6100]<BR>
<BR>
4. the /var/log/Xorg.0.log file of RHEL 6.: found following in it:<BR>
<BR>
[ 79.083] (--) Chipset Supported AMD Graphics Processor (0x6640) found<BR>
[ 79.094] (WW) fglrx: No matching Device section for instance (BusID PCI:0@1:0:1) found<BR>
[ 79.097] (II) fglrx(0): pEnt->device->identifier=0x1998680<BR>
<BR>
[ 79.417] (**) fglrx(0): AMD 2D Acceleration Architecture enabled<BR>
[ 79.417] (--) fglrx(0): Chipset: "AMD Radeon HD 8950" (Chipset = 0x6640)<BR>
[ 79.417] (--) fglrx(0): (PciSubVendor = 0x1028, PciSubDevice = 0x15cd)<BR>
[ 79.417] (==) fglrx(0): board vendor info: third party graphics adapter - NOT original AMD<BR>
<BR>
[ 81.002] (II) fglrx(0): Adapter AMD Radeon HD 8950 has 6 configurable heads and 1 displays connected.<BR>
<BR>
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