From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Date: Thu, 05 Nov 2015 20:23:01 +0000 Subject: Re: Mobility Radeon HD 4530/4570/545v: flicker in 1920x1080 Message-Id: <20151105202301.GA3624@amd> List-Id: References: <20151031201344.GA30459@amd> <563522C5.1000206@amd.com> <20151031212259.GA6253@amd> <20151103220919.GA4824@amd> <20151103230329.GA4167@amd> <5639B580.1050409@vodafone.de> <20151104221000.GA3608@amd> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Alex Deucher Cc: "linux-fbdev@vger.kernel.org" , kernel list , Maling list - DRI developers , "Deucher, Alexander" , Christian =?iso-8859-1?Q?K=F6nig?= 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