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?)