From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 109135] R9 390 hangs at boot with DPM/DC enabled for kernels 4.19.x and above, says KMS not supported
Date: Mon, 14 Jan 2019 19:19:25 +0000 [thread overview]
Message-ID: <bug-109135-502-l3LPcau5xM@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-109135-502@http.bugs.freedesktop.org/>
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https://bugs.freedesktop.org/show_bug.cgi?id=109135
--- Comment #18 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to rmuncrief from comment #17)
> Yes, As I said in the beginning if you don't set amdgpu.dpm=1 the system
> boots but resume doesn't work. I presume it's because power management isn't
> working. All kernels before 4.19.x work great, and have no problem with
> resume so long as dpm is enabled.
dynamic power management is always enabled by default. the only way to disable
it is to set dpm=0. dpm=1 either does nothing or changes the implementation
used in the driver depending on the asic. You shouldn't set dpm= unless you
are debugging something. For your asic, kernels 4.18 and older the default was
the original dpm implementation; setting dpm=1 used the newer powerplay code.
For kernel 4.19 and newer, the default implementation switched to the newer
powerplay code and setting dpm=1 switched back to the older implementation. So
removing dpm=1 is correct for 4.19 and newer. Can you elaborate on the resume
issue?
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next prev parent reply other threads:[~2019-01-14 19:19 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-22 19:20 [Bug 109135] R9 390 hangs at boot with DPM/DC enabled for kernels 4.19.x and above, says KMS not supported bugzilla-daemon
2018-12-22 19:21 ` bugzilla-daemon
2018-12-23 19:52 ` bugzilla-daemon
2018-12-24 21:43 ` bugzilla-daemon
2018-12-27 16:10 ` bugzilla-daemon
2018-12-27 16:10 ` bugzilla-daemon
2018-12-27 16:10 ` bugzilla-daemon
2018-12-27 16:15 ` bugzilla-daemon
2019-01-10 23:47 ` bugzilla-daemon
2019-01-11 0:54 ` bugzilla-daemon
2019-01-11 1:09 ` bugzilla-daemon
2019-01-11 1:25 ` bugzilla-daemon
2019-01-11 15:30 ` bugzilla-daemon
2019-01-11 16:29 ` bugzilla-daemon
2019-01-11 20:10 ` bugzilla-daemon
2019-01-11 20:38 ` bugzilla-daemon
2019-01-11 20:44 ` bugzilla-daemon
2019-01-11 20:49 ` Alex Deucher
2019-01-11 20:49 ` bugzilla-daemon
2019-01-12 21:46 ` bugzilla-daemon
2019-01-14 15:45 ` bugzilla-daemon
2019-01-14 17:53 ` bugzilla-daemon
2019-01-14 19:19 ` bugzilla-daemon [this message]
2019-01-14 20:04 ` bugzilla-daemon
2019-01-16 14:27 ` bugzilla-daemon
2019-01-16 16:45 ` bugzilla-daemon
2019-01-16 17:57 ` bugzilla-daemon
2019-01-16 18:58 ` bugzilla-daemon
2019-11-19 9:08 ` bugzilla-daemon
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