From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?Q?Michel_D=c3=a4nzer?= Date: Fri, 06 Nov 2015 02:25:09 +0000 Subject: Re: Mobility Radeon HD 4530/4570/545v: flicker in 1920x1080 Message-Id: <563C0F85.8070204@daenzer.net> 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> <20151105202301.GA3624@amd> In-Reply-To: <20151105202301.GA3624@amd> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: Pavel Machek , Alex Deucher Cc: "Deucher, Alexander" , "linux-fbdev@vger.kernel.org" , kernel list , Maling list - DRI developers , =?UTF-8?Q?Christian_K=c3=b6nig?= On 06.11.2015 05:23, Pavel Machek wrote: > Hi! >=20 >>>> The flickering would vanish completely if that's the reason for the is= sue >>>> 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=3D0? Sounds more like either memory >> reclocking happening outside of vblank, or underflow to the display >> controllers. >=20 > No, it does not: >=20 > pavel@half:~$ cat /proc/cmdline > BOOT_IMAGE=3D(hd0,2)/l/linux/arch/x86/boot/bzImage root=3D/dev/sda4 > resume=3D/dev/sda1 radeon.dpm=3D0 >=20 > ..and same issue. And yes, it looks like an underflow to me. How can I > debug reclocking / underflows? Does radeon.disp_priority=3D2 help? --=20 Earthling Michel D=C3=A4nzer | http://www.amd.c= om Libre software enthusiast | Mesa and X developer