Date: Tue, 28 Apr 2020 07:07:18 +0000 From: Alexey Dokuchaev <danfe@freebsd.org> To: "thorsten.johannvorderbrueggen@t-online.de" <thorsten.johannvorderbrueggen@t-online.de> Cc: freebsd-x11@freebsd.org Subject: Re: AMD A6-4455M APU with Radeon(tm) HD Graphics in 50% leads to a black screen when starting X Message-ID: <20200428070718.GA78285@FreeBSD.org> In-Reply-To: <20200427173331.5b1191af406ca2bc4492679f@t-online.de> References: <20200427173331.5b1191af406ca2bc4492679f@t-online.de>
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On Mon, Apr 27, 2020 at 05:33:31PM +0200, thorsten.johannvorderbrueggen@t-online.de wrote: > Hi @all, > > i have a [AMD A6-4455M based] Samsung NP535U3C-A02DE Laptop and i > installed FreeBSD 12.1 on it ... so far so good :-) ... before that i > had void-linux on it ... it worked with any trouble ... especially X > > With FreeBSD i have a 50/50 chance to get a black screen at the end... > the sytems starts ... loader starts ... the kernel starts ... it > detects drm and so but then it switches the resolution to 1366x768 ... > this takes some time (10-15 sec) I'm having similar issues with A8-5550M, none of the drm-* ports work reliably on it. It usually locks up with black screen, or even if it manages to load, X.Org falls back to software rendering. > [drm:r600_ring_test] radeon: ring 0 test failed (scratch(0x8504)=0xCAFEDEAD) > [drm:cayman_resume] cayman startup failed on resume > [drm:radeon_dp_link_train_cr] displayport link status failed > [drm:radeon_dp_link_train_cr] clock recovery failed > drmn0: ring 0 stalled for more than 10495msec > drmn0: GPU lockup (current fence id 0x0000000000000001 last fence id 0x0000000000000002 on ring 0) > drmn0: ring 0 stalled for more than 11026msec I believe these "stalled" lines are related to the 10-20 seconds delay during initialization. Something got broken in Northern Islands cards support in recent years, it was definitely working two or three years ago (fast module loading, no crashes, hw-accelerated rendering). I'm slowly bisecting and trying different versions of the DRM ports, but that can take months... I have no good news or answers at this moment. /danfe
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