AMD E-450 APU and KMS

I have this weird behaviour with my AMD E-450 APU using the native radeon drivers. KMS initialization sometimes causes the screen to be full of various coloured pixels (and you see the contours of text in what I presume to be the black/white contrasts in the noise). Usually re-starting again once or a couple of times resolves the issue.
It almost seems like KMS is trying to initialize before the graphics of the APU has "heated up" if that makes any sense at all...
Anyone got an idea for a solution? Not critical but annoying.
btw: this problem has persisted over several kernel releases and radeon updates.

I also have this CPU/GPU/APU and already filed a bug report. But I don't see "various coloured pixels", but only a black screen (although: one time I had white stripes on black ground, like a zebra)

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    I had two XP Sp3 32 bit systems I wanted to upgrade to Window 8 Pro 64 bit (with the $40 upgrade deal available now). System#1 is: I7 920/Asus P6T deluxe/EVGA 560Ti/3GB/1 TB SATA 300 drive/1.44 Floppy/ 12X Bluray burner (pulled the old TV tuner card for
    upgrade-incompatible). I ran the Windows 8 upgrade advisor - very few issues (TV Tuner card as mentioned and other software) - bought the upgrade. Downloaded the upgrade from my Win7Pro 64bit system to obtain the 64bit ISO (2.69GB) - burned to DVD. Installed
    from DVD; no problems, finished in under 20 minutes - working great (really fast boot!).
    System#2 is: Opteron 180/Asus A8N-E/EVGA 275GTX/2GB/1 TB SATA 300 drive/ 1.44 Floppy/ 16X DVD RW burner; the Windows 8 upgrade advisor - more incompatible software than system#1, but no incompatible hardware. I had read a number of blogs concerning the issues
    others were having with the upgrade failing, so before I purchased, I thought I would run the 64bit install DVD I had (known to work on the other system) to see if it worked. I should note this system was not-in-use and thus I was not worried if the install
    failed (I'd just be annoyed!). Ran the install from the DVD; initial splash screen - no spinning dots - waited 15 minutes (by which time no activity on DVD or hard drive) - failure. Rebooted - entered bios (1010) - tried many combinations of settings up to
    disabling nearly everything (NVRAID, Legacy USB, Floppy, Audio97- all disabled / moved SATA into every slot (1-4) / tried SATA 150 and SATA 300 (SATA2, slots 3-4) - no change - failure X4 attempts. Now original XP3 installation is corrupted (GRRRR!) - I should
    have imaged the drive BEFORE - oh well. Read more about others experience with this seemingly NForce board-related issue. Plan B - I will try install with an IDE (PATA) hard drive (80GB) - failure. Read more - some mention Window 8 installer not "liking" XP
    partitions / disks (???); Plan C - Re-partition / format / check 80 GB IDE drive with WDTools - attempted Win8Pro install - failure. Dejected; last attempt before considering Win8Pro 32bit - Plan D - Re-partition / format / check 1 TB SATA 300 drive with SeaTools
    (Barracuda 32GB buffer-7200rpm) - run Win8PRO 64bit install from DVD (build 9200) - success! Install took nearly an hour, with 3 reboots to the finish. Specifics (install configuration): 1 TB SATA drive in Slot 4 (SATA2), upgraded memory to 4GB Corsair PC3200
    (4 slots filled), Two DVD drives on Primary IDE channel (master and slave), secondary IDE channel - no devices, bios (1010) - NVRAID, Audio97,1394 port,LAN -disabled; USB 2.0, USB Legacy, Floppy - enabled, IDE-Auto), TrendNet USB wireless adapter on USB slot
    2 (motherboard), EVGA 275GTX in PCIe slot 1, no other cards. System seems to be performing well (fast boot times, no hangs), but as noted, no sound (I actually forgot to re-enable the Audio97 device in bios; it was 2am). I will see if I can get the Audio97
    enabled today; my backup is to add a Turtle Beach Montego DDL PCI card (with the Windows7 64bit driver and run in compatiblity mode). Hope this saga might help some others out - good luck.

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