https://bugs.freedesktop.org/show_bug.cgi?id=101877
Bug ID: 101877 Summary: R9 390 with multiple monitors always using highest memory clock Product: DRI Version: DRI git Hardware: Other OS: All Status: NEW Severity: normal Priority: medium Component: DRM/AMDgpu Assignee: dri-devel@lists.freedesktop.org Reporter: hisele@siduge.v0yd.nl
My MSI r9 390 forces the memory clock to 150000 if I plug in more than one monitor. The card draws 40 watts more power while idle and keeps the fans running all the time.
This is happening with both amdgpu and radeon and I can fix the problem by disabling dpm, but this causes some other issues.
I read earlier that this behaviour is intended and is a common problem with graphics cards but IIRC a recent driver update fixed this on windows so I'd like to know if there is any chance to also get a fix on linux?
https://bugs.freedesktop.org/show_bug.cgi?id=101877
Alex Deucher alexdeucher@gmail.com changed:
What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |NOTABUG
--- Comment #1 from Alex Deucher alexdeucher@gmail.com --- mclk changes have to be synced to the vertical blanking period of the displays. If the displays have different timings, it's not possible to change the mclk without causing display flickering.
https://bugs.freedesktop.org/show_bug.cgi?id=101877
--- Comment #2 from hisele@siduge.v0yd.nl --- So does the windows driver detect the timing of the displays and keep the mclk low if it's in sync?
https://bugs.freedesktop.org/show_bug.cgi?id=101877
--- Comment #3 from Alex Deucher alexdeucher@gmail.com --- AFAIK, the windows driver forces the mclk high as well when multiple displays are attached. The only possible exception would be if multiple displays had the exact same timing and the vblank periods could be aligned.
https://bugs.freedesktop.org/show_bug.cgi?id=101877
--- Comment #4 from hisele@siduge.v0yd.nl --- Yeah, both my monitors are the same model so this is probably the case. If there's no way to enable changing the mclk, can I set it to a lower default value without disabling dpm completely?
https://bugs.freedesktop.org/show_bug.cgi?id=101877
--- Comment #5 from Alexandre Pereira pereira.alex@gmail.com --- I have a similar problem.
I have a Rx 580 with 2 exactly equal monitors. On windows, there is no issue and memory clock is always at 300mhz, except when gaming.
When on linux, If using graphical display, memory clock is always MAX. If i am only on the tty's ( text mode only ) I can set it to 300mhz, after changing memory clock pp setting ( echo 1 > pp_mclk_od ).
Like the op, drawing 40 watts more power than windows, is very undesirable, besides also running much cooler on windows. Also on windows I never saw any problem whatsoever with it running at minimum 300mhz.
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