[Bug 57281] New: Radeon: Bad performance and power consumption

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https://bugzilla.kernel.org/show_bug.cgi?id=57281

           Summary: Radeon: Bad performance and power consumption
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.8.2-pf
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: ka.nick@mail.ru
        Regression: No


Created an attachment (id=100261)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=100261)
lspci -vv output

After upgrading my AMD E-450-based notebook to a newer one (HP 4545s
A4-3300-based) i noticed that in spite of noticeable higher clock rate the
video performance is about 15-20% worse than on E-450. It also got much hotter
initially, which I could cure by passing pcie_aspm=force to the kernel. In
spite of this I still have a feeling that it probably eats more power than it
should (which I can not prove with numbers, of course) comparing to E-450 (and
fglrx) experience. (Yes, I know the proprietary driver performs better in terms
of power management, too, but the question is to what extent?) Anyways, it
shouldn't underperform the older and weaker model...

It also shows the message at boot time:
[drm:radeon_acpi_init] *ERROR* Cannot find backlight controller
but it seems to work fine after that. (Shall I post another bug on this?)

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