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

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Message-ID: <20151031212259.GA6253@amd>
Date:	Sat, 31 Oct 2015 22:22:59 +0100
From:	Pavel Machek <pavel@....cz>
To:	Christian König <christian.koenig@....com>
Cc:	alexander.deucher@....com, dri-devel@...ts.freedesktop.org,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-fbdev@...r.kernel.org
Subject: Re: Mobility Radeon HD 4530/4570/545v: flicker in 1920x1080

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@...f:~$ 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@...f:~$ xrandr --output VGA-0 --mode 1600x1200
> >  pavel@...f:~$ xrandr --output VGA-0 --mode 1920x1080
> >  pavel@...f:~$ 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.

pavel@...f:~/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@...f:/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@...f:/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_CLASS=30000
 uevent:PCI_ID=1002:9553
 uevent:PCI_SUBSYS_ID=1025:0212
 uevent:PCI_SLOT_NAME=0000:01:00.0
 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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