Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932169AbbKEUXF (ORCPT ); Thu, 5 Nov 2015 15:23:05 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:48762 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755524AbbKEUXD (ORCPT ); Thu, 5 Nov 2015 15:23:03 -0500 Date: Thu, 5 Nov 2015 21:23:01 +0100 From: Pavel Machek To: Alex Deucher Cc: Christian =?iso-8859-1?Q?K=F6nig?= , "Deucher, Alexander" , "linux-fbdev@vger.kernel.org" , Christian =?iso-8859-1?Q?K=F6nig?= , Maling list - DRI developers , kernel list Subject: Re: Mobility Radeon HD 4530/4570/545v: flicker in 1920x1080 Message-ID: <20151105202301.GA3624@amd> References: <20151031201344.GA30459@amd> <563522C5.1000206@amd.com> <20151031212259.GA6253@amd> <20151103220919.GA4824@amd> <20151103230329.GA4167@amd> <5639B580.1050409@vodafone.de> <20151104221000.GA3608@amd> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1207 Lines: 35 Hi! > >> The flickering would vanish completely if that's the reason for the issue > >> you are seeing. > > > >> Try setting ref_div_min and ref_div_max to 2 in > >> radeon_compute_pll_avivo(). > > > > Ok, I did this, but no luck, still flickers. But the flicker only > > happens when something changes on screen, like dragging a big > > window. Is that consistent with wrong PLL timings? > > Does it go away with radeon.dpm=0? Sounds more like either memory > reclocking happening outside of vblank, or underflow to the display > controllers. No, it does not: pavel@half:~$ cat /proc/cmdline BOOT_IMAGE=(hd0,2)/l/linux/arch/x86/boot/bzImage root=/dev/sda4 resume=/dev/sda1 radeon.dpm=0 ..and same issue. And yes, it looks like an underflow to me. How can I debug reclocking / underflows? Best regards, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/