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Date: Fri, 6 Nov 2015 11:25:09 +0900 From: Michel Dänzer <michel@...nzer.net> To: Pavel Machek <pavel@....cz>, Alex Deucher <alexdeucher@...il.com> Cc: "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>, kernel list <linux-kernel@...r.kernel.org>, Maling list - DRI developers <dri-devel@...ts.freedesktop.org>, "Deucher, Alexander" <alexander.deucher@....com>, Christian König <christian.koenig@....com> Subject: Re: Mobility Radeon HD 4530/4570/545v: flicker in 1920x1080 On 06.11.2015 05:23, Pavel Machek wrote: > 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@...f:~$ 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? Does radeon.disp_priority=2 help? -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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