Good news regarding tearing and low EmulationStation performance on Pi 4
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So I did a normal
apt updatetoday and apparently we're officially on 5.4 now? Using the KMS driver and new audio driver and everything seems to be working as intended, save for a "failed to find mixer elements" error with ES that's probably related to the new audio driver, but that's not much of a problem.EDIT: Hm, maybe it's not working quite as intended after all. I'm getting audio dropouts on more demanding stuff (Dreamcast with Redream, some games that require MAME 2016) using the new audio driver). Think I'll go back to FKMS/old audio driver until the new stuff has been tested a bit more.
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@SeraphisCain said in Good news regarding tearing and low EmulationStation performance on Pi 4:
So I did a normal
apt updatetoday and apparently we're officially on 5.4 now? Using the KMS driver and new audio driver and everything seems to be working as intended, save for a "failed to find mixer elements" error with ES that's probably related to the new audio driver, but that's not much of a problem.EDIT: Hm, maybe it's not working quite as intended after all. I'm getting audio dropouts on more demanding stuff (Dreamcast with Redream, some games that require MAME 2016) using the new audio driver). Think I'll go back to FKMS/old audio driver until the new stuff has been tested a bit more.
I just confirmed this as well about the kernel update.
So in order to use the vc4hdmi audio driver, you need to disable the broadcom2835 one in your config.txt
Using both is not possible, or at least that is what was mentioned before. It was said that both drivers are fighting for the same resources hence why one of them needs to be disabled.
The vc4hdmi audio driver is a WIP, so results will vary.
Also, for the vc4hdmi driver you need to use an updated vc4hdmi.conf in the /usr/share/alsa/cards folder:
I am surprised that this file was not replaced with the new one with the kernel update.
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For the moment I'm using
dtoverlay=vc4-kms-v3d,noaudioalong with dtparam=audio=on to use the new video driver along with the old audio driver until things get ironed out with the new HDMI audio driver. -
@SeraphisCain said in Good news regarding tearing and low EmulationStation performance on Pi 4:
For the moment I'm using
dtoverlay=vc4-kms-v3d,noaudioalong with dtparam=audio=on to use the new video driver along with the old audio driver until things get ironed out with the new HDMI audio driver.The correct usage is dtoverlay=vc4-kms-v3d,noaudio=on
You can verify by typing aplay -l in the cmdline and the vc4hdmi devices will not be present.
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According to this:
https://github.com/raspberrypi/linux/pull/3640#issuecomment-639053905
noaudioandnoaudio=onshould have the same effect, since "on" is assumed if no parameter is given. -
@SeraphisCain said in Good news regarding tearing and low EmulationStation performance on Pi 4:
issuecomment
Good catch. I haven’t used the driver in awhile. For me the lack of a mixer doesn’t make it a suitable driver.
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Yep, looks like they officially released 5.4 and the gamecon driver still doesn't work. I have no idea what the problem is but I did post the problem to them months ago in their forum and got ignored.
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@Darksavior said in Good news regarding tearing and low EmulationStation performance on Pi 4:
I have no idea what the problem is but I did post the problem to them months ago in their forum and got ignored.
Well, it's not their driver - why would you expect them to fix it ?
You should have reported this upstream - https://github.com/marqs85/gamecon_gpio_rpi. -
@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,noaudiocombined withdtparam=audio=onThis 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-v3danddtparam=audio=offYou 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,noaudiocombined withdtparam=audio=onThis 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,noaudiocombined withdtparam=audio=onJust 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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