Good news regarding tearing and low EmulationStation performance on Pi 4
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@mitu Well, I don't know of these things. A simple "not our problem" would've done it.
Buzz always tells people to post problems on the forum first, so I'm always hesitant to post problems at the github. -
@Darksavior said in Good news regarding tearing and low EmulationStation performance on Pi 4:
Buzz always tells people to post problems on the forum first, so I'm always hesitant to post problems at the github.
Yes, that's the preferred approach - though in this case it's not a RetroPie issue. It looks like the module uses a call to
do_gettimeofday
, which was deprecated in the Linux kernel in preparation for the 2038-pocalypse. I'll take a look at what changes might be needed and perhaps submit a patch upstream. -
Well now that 5.4 is official, is there any way to get kodi working with this KMS driver or no?
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@PhoenixJedi I think we just have to wait for Kodi 19 to be released.
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@PhoenixJedi Nope, Kodi will only work with KMS in Kodi 19.
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Now that the update is official, is the KMS driver enabled by default, or do you still have to add the line in the boot config? Is the audio fixed with the KMS driver?
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@Beretta9 said in Good news regarding tearing and low EmulationStation performance on Pi 4:
Now that the update is official, is the KMS driver enabled by default, or do you still have to add the line in the boot config? Is the audio fixed with the KMS driver?
Not enabled by default, and the KMS driver is very much still a WIP.
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@bluestang said in Good news regarding tearing and low EmulationStation performance on Pi 4:
It is not possible to use the BCM2835 and the vc4hdmi drivers at the same time.
That's why i think i got this tip: dtoverlay=vc4-kms-v3d-pi4,audio=off (with dtparam=audio=on and old vc4-hdmi.conf). But that indeed did not work
What is your output when you type in aplay -l in the cmd line?
i cannot check, i rolled back to the old kernel. Will try again in the near future
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@akamming said in Good news regarding tearing and low EmulationStation performance on Pi 4:
That's why i think i got this tip: dtoverlay=vc4-kms-v3d-pi4,audio=off (with dtparam=audio=on and old vc4-hdmi.conf). But that indeed did not work
The usage is
dtoverlay=vc4-kms-v3d,noaudio
combined withdtparam=audio=on
This turns off the vc4hdmi audio driver and keeps the BCM2835 audio driver on.
If you want the vc4hmdi audio driver the usage is
dtoverlay=vc4-kms-v3d
anddtparam=audio=off
You also need to replace the old vc4hdmi.conf file with this new one https://github.com/LibreELEC/LibreELEC.tv/blob/master/projects/RPi/filesystem/usr/share/alsa/cards/vc4-hdmi.conf
I wouldn’t recommend this since this driver is very much a WIP and it lacks several features still.
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@bluestang said in Good news regarding tearing and low EmulationStation performance on Pi 4:
The usage is
dtoverlay=vc4-kms-v3d,noaudio
combined withdtparam=audio=on
This turns off the vc4hdmi audio driver and keeps the BCM2835 audio driver on.
Aha... then i think i know here i went wrong. I used audio=off instead of noaudio. Tx! I will try again in a few days...
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@bluestang said in Good news regarding tearing and low EmulationStation performance on Pi 4:
The usage is
dtoverlay=vc4-kms-v3d,noaudio
combined withdtparam=audio=on
Just confirmed: This fixes the hdmi audio. Tx a lot!
i saw a video on YouTube with someone claiming to overclock the ARM to 2250 on 5.4. So apparently 5.4 with the new firmware has less restrictions on overclock, but i cannot find anywhere on the internet what the new settings are... does any one know? Cause if we can boost cpu and/or gpu we might even get a better emulation performance on the pi 4....
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So I'm still having the "jerky scrolling" issue with the KMS driver that I was having when I tested it prior to official release. Noticed it in Super Mario Bros. and Sonic 2 before official release, and Castlevania Chronicles (PS1) just now. Went back to FKMS and it's fixed. Anyone else notice issues with stuttering/jerky scrolling on KMS?
@akamming You said earlier in the thread you rolled back to the previous kernel. How did you do that? There's something I need to check in Redream on the previous kernel (and if my suspicion is correct, I'll be staying on the previous kernel).
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@SeraphisCain said in [Good news regarding tearing and low
@akamming You said earlier in the thread you rolled back to the previous kernel. How did you do that? There's something I need to check in Redream on the previous kernel (and if my suspicion is correct, I'll be staying on the previous kernel).
I did it using these commands:
sudo apt-get update sudo apt-get install --reinstall raspberrypi-bootloader raspberrypi-kernel
(and ofcourse reverting other changes i made myself)
but that won't work anymore, cause the raspberry foundation now moved to 5.4 in the official updates as well i noticed...
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now that it's working i did some testing. Decided to keep the kms driver. i noticed
the cons:
- omx player and kodi don't work anymore (expected), but for me that's fine.. just had to put back the setting in emulation station that it's not using omx player for the video previews, and wasn't using kodi anyway, so removed it from the system
- According to some YouTube video's i should be able to overclock the cpu more (now stable at 2100), but to me this only led to an instable system, so did not see the expected better performance here...
the pros:
- emulationstation feels much smoother. Is feels just like everything is a bit more responsive (but to be honest this can be just a feeling. I cannot measure this objectively). @SeraphisCain i did not see any stuttering/jerky scrolling….
- i was able to get some extra power from the gpu : I was able to bring my v3d_freq to 825 while keeping the pi stable. This was 750 on the old kernel/firmware.
- the combination of extra gpu overclock and kms driver lead to much better emulation performance on several emulators on which the gpu is a bottleneck :
- n64 on lr-mupen64plus-nx: no more audio stuttering in lr-mupen64plus-nx when running in 2X resolution. So now 640x480 available for all games. on old kernel a lot of games had to run on 320x240 to prevent this audio stutter
- dreamcast/atomiswave on lr-flycast: almost all games which ran on 640x480 now run 100% speed on 960x720 without frameskip (!)
- psp on ppsspp: can now run almost all games on 3x resolution (used to be 2x resolution). Still using frameskip setting auto/1 (but i also did dat on the 2x resolution on the old kernel/firmware).
Overall: very happy! big improvement in overall performance!
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I noticed some errors on the console. Haven't noticed them before. The only change i lately did was the move to 5.4 using the kms driver. So i think it is related.
mmal: mmal_vc_component_create: failed to create component 'vc.ril.hvs' (1:ENOMEM) mmal: mmal_component_create_core: could not create component 'vc.ril.hvs' (1)
All works fine, dos anyone know what they mean and how to fix (or how they can be supressed, alle seems to work fine...)?
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@akamming
Hi, I don't see any noticible improvement, can please share your settings:[pi4]
Enable DRM VC4 V3D driver on top of the dispmanx display stack
dtoverlay=vc4-kms-v3d,noaudio
dtparam=audio=on
max_framebuffers=2over_voltage=6
arm_freq=2000
gpu_freq=700 -
These are my /boot/config.txt settings which sped up my pi 4:
over_voltage=6 arm_freq=2100 v3d_freq=815 gpu_freq=750 hdmi_enable_4kp60=1 dtoverlay=vc4-kms-v3d-pi4,noaudio dtparam=audio=on
I had some instability, which was fixed by bringing down v3d_freq from 825 to 815 since the last post i made here...
In the individual emulators i set all settings to the fastest settings. Also bringing down the screen resolution helps a lot to get better fps. (e.g. N64 games i can only run at intern resolution of the emulator of 640x480, so i use runcommand to set screen resolution to 848x480. This gives much better framerate than 720p or 1080p)
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@akamming
I tried to switch to the kms driver but I only have a black screen on the boot screen.Could share your config.txt
My settings
For more options and information see
http://rpf.io/configtxt
Some settings may impact device functionality. See link above for details
uncomment if you get no picture on HDMI for a default "safe" mode
hdmi_safe=1
uncomment this if your display has a black border of unused pixels visible
and your display can output without overscan
disable_overscan=1
uncomment the following to adjust overscan. Use positive numbers if console
goes off screen, and negative if there is too much border
overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0uncomment to force a console size. By default it will be display's size minus
overscan.
#framebuffer_width=1280
#framebuffer_height=720uncomment if hdmi display is not detected and composite is being output
hdmi_force_hotplug=1
uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1uncomment to force a HDMI mode rather than DVI. This can make audio work in
DMT (computer monitor) modes
#hdmi_drive=2
uncomment to increase signal to HDMI, if you have interference, blanking, or
no display
config_hdmi_boost=9
uncomment for composite PAL
#sdtv_mode=2
#uncomment to overclock the arm. 700 MHz is the default.
over_voltage=4
arm_freq=1950
gpu_freq=600
v3d_freq=750Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=onUncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18Additional overlays and parameters are documented /boot/overlays/README
Enable audio (loads snd_bcm2835)
dtparam=audio=on
[pi4]
Enable DRM VC4 V3D driver on top of the dispmanx display stack
dtoverlay=vc4-fkms-v3d-pi4, noaudio
max_framebuffers=2[all]
#dtoverlay=vc4-fkms-v3d
gpu_mem=256
hdmi_enable_4kp60=1 -
@JUM please read https://retropie.org.uk/forum/topic/3/read-this-first for how to format code blocks correctly. what you've pasted is unreadable.
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@akamming said in Good news regarding tearing and low EmulationStation performance on Pi 4:
These are my /boot/config.txt settings which sped up my pi 4:
over_voltage=6 arm_freq=2100 v3d_freq=815 gpu_freq=750 hdmi_enable_4kp60=1 dtoverlay=vc4-kms-v3d-pi4,noaudio dtparam=audio=on
I had some instability, which was fixed by bringing down v3d_freq from 825 to 815 since the last post i made here...
In the individual emulators i set all settings to the fastest settings. Also bringing down the screen resolution helps a lot to get better fps. (e.g. N64 games i can only run at intern resolution of the emulator of 640x480, so i use runcommand to set screen resolution to 848x480. This gives much better framerate than 720p or 1080p)
I tried to switch for kms driver but I only have a black screen on the boot screen.
Could share your config.txt
My settings
Does this part of the config go under [pi4] or [all]?
hdmi_enable_4kp60=1 dtoverlay=vc4-kms-v3d-pi4,noaudio dtparam=audio=on
My config must be wrong in that part.
# Enable audio (loads snd_bcm2835) dtparam=audio=on [pi4] # Enable DRM VC4 V3D driver on top of the dispmanx display stack dtoverlay=vc4-kms-v3d-pi4,noaudio max_framebuffers=2 [all] #dtoverlay=vc4-fkms-v3d gpu_mem=256 hdmi_enable_4kp60=1
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