Re: Mobility Radeon HD 4530/4570/545v: flicker in 1920x1080

[Alex Deucher <alexdeucher@gmail.com>]

On Sat, Oct 31, 2015 at 5:22 PM, Pavel Machek <pavel@ucw.cz> wrote:
> Hi!
>
>> >4.3-rc7 kernel, graphics works reasonably well in 1600x1200 mode. But
>> >my monitor is native 1920x1080, so that mode looks pretty ugly on
>> >screen. If I go to 1920x1080, I see colored horizontal lines (often
>> >black) as soon as there's graphics activity.
>> >
>> >pavel@half:~$ xrandr
>> >Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
>> >VGA-0 connected 1920x1080+0+0 (normal left inverted right x axis y
>> >axis) 478mm x 268mm
>> >    1920x1080     60.00*+
>> >       1600x1200     60.00
>> >          1680x1050     59.95
>> >         1280x1024     75.02    60.02
>> >            1440x900      59.89
>> >               1024x768      75.08    60.00
>> >                  800x600       75.00    60.32
>> >                     640x480       75.00    60.00
>> >                        720x400       70.08
>> >  pavel@half:~$ xrandr --output VGA-0 --mode 1600x1200
>> >  pavel@half:~$ xrandr --output VGA-0 --mode 1920x1080
>> >  pavel@half:~$ xrandr --output VGA-0 --mode 1600x1200
>> >
>> >
>> >This is Acer notebook,
>> >
>> >01:00.0 VGA compatible controller: Advanced Micro Devices,
>> >Inc. [AMD/ATI] RV710/M92 [Mobility Radeon HD 4530/4570/545v]
>
>> >Any ideas?
>>
>> Alex probably knows more about this, but it sounds like problems with
>> switching the memory clocks on 3D load.
>
>> Try to disable power management completely with radeon.dpm=0 on the kernel
>> command line or nailing the hardware at a specific power level using
>> sysfs.
>
> I tried that, but it still flickers.

It's probably pll stability.  There seem to be a number of regressions
since the pll code was rewritten to support matching the hdmi clocks
more closely.  Does this patch help?

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c
b/drivers/gpu/drm/radeon/atombios_crtc.c
index dac78ad..b86f06a 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -569,6 +569,8 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
        radeon_crtc->pll_flags = 0;

        if (ASIC_IS_AVIVO(rdev)) {
+               radeon_crtc->pll_flags |= RADEON_PLL_PREFER_MINM_OVER_MAXP;
+
                if ((rdev->family = CHIP_RS600) ||
                    (rdev->family = CHIP_RS690) ||
                    (rdev->family = CHIP_RS740))

Unfortunately, it can't be applied as is because we had a similar
patch which was reverted because it regressed a bunch of other
systems.  The actual pll limits probably need to be tweaked.

Alex


>
> pavel@half:~/misc/fgfs$ cat /proc/cmdline
> BOOT_IMAGE=(hd0,2)/l/linux/arch/x86/boot/bzImage root=/dev/sda4
> resume=/dev/sda1 radeon.dpm=0
>
>> Power consumption would be totally awkward, but it should help nailing down
>> the problem.
>
> It seems chromium makes the flicker way worse.. even when running on
> different virtual desktop. I'm not sure which sysfs settings I should
> tweak (or if I should be tweaking them with .dpm=0). But sysfs says:
> pavel@half:/sys/bus/pci/drivers/radeon/0000:01:00.0$ ls
> backlight                                                 drm
> irq
> resource
> boot_vga                  enable         local_cpulist  resource0
> broken_parity_status        firmware_node  local_cpus   resource0_wc
> class                                                     graphics
> modalias                                                  resource1
> config
>  i2c-0           msi_bus        resource2
>  consistent_dma_mask_bits  i2c-1                 power          rom
>  d3cold_allowed                                    i2c-2
>  power_method                                      subsystem
>  device
>  i2c-3           power_profile  subsystem_device
>  dma_mask_bits                    i2c-4          remove
>  subsystem_vendor
>  driver                   i2c-5          rescan         uevent
>  driver_override                           i2c-6                 reset
>  vendor
>  pavel@half:/sys/bus/pci/drivers/radeon/0000:01:00.0$ grep . *
>  grep: backlight: Is a directory
>  boot_vga:1
>  broken_parity_status:0
>  class:0x030000
>  Binary file config matches
>  consistent_dma_mask_bits:40
>  d3cold_allowed:1
>  device:0x9553
>  dma_mask_bits:40
>  grep: driver: Is a directory
>  driver_override:(null)
>  grep: drm: Is a directory
>  enable:1
>  grep: firmware_node: Is a directory
>  grep: graphics: Is a directory
>  grep: i2c-0: Is a directory
>  grep: i2c-1: Is a directory
>  grep: i2c-2: Is a directory
>  grep: i2c-3: Is a directory
>  grep: i2c-4: Is a directory
>  grep: i2c-5: Is a directory
>  grep: i2c-6: Is a directory
>  irq:16
>  local_cpulist:0-3
>  local_cpus:f
>  modalias:pci:v00001002d00009553sv00001025sd00000212bc03sc00i00
>  msi_bus:1
>  grep: power: Is a directory
>  power_method:profile
>  power_profile:default
>  grep: remove: Permission denied
>  grep: rescan: Permission denied
>  grep: reset: Permission denied
>  resource:0x00000000c0000000 0x00000000cfffffff 0x0000000000042208
>  resource:0x0000000000005000 0x00000000000050ff 0x0000000000040101
>  resource:0x00000000d6200000 0x00000000d620ffff 0x0000000000040200
>  resource:0x0000000000000000 0x0000000000000000 0x0000000000000000
>  resource:0x0000000000000000 0x0000000000000000 0x0000000000000000
>  resource:0x0000000000000000 0x0000000000000000 0x0000000000000000
>  resource:0x00000000d6220000 0x00000000d623ffff 0x0000000000046202
>  grep: resource0: Permission denied
>  grep: resource0_wc: Permission denied
>  grep: resource1: Permission denied
>  grep: resource2: Permission denied
>  grep: rom: Permission denied
>  grep: subsystem: Is a directory
>  subsystem_device:0x0212
>  subsystem_vendor:0x1025
>  uevent:DRIVER=radeon
>  uevent:PCI_CLASS0000
>  uevent:PCI_ID\x1002:9553
>  uevent:PCI_SUBSYS_ID\x1025:0212
>  uevent:PCI_SLOT_NAME\000:01:00.0
>  uevent:MODALIAS=pci:v00001002d00009553sv00001025sd00000212bc03sc00i00
>  vendor:0x1002
>
> Thanks,
>                                                                         Pavel
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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