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by 6by9
Mon Aug 19, 2019 9:23 pm
Forum: Graphics programming
Topic: Programmatically enabled/disable "hdmi_ignore_edid"
Replies: 3
Views: 154

Re: Programmatically enabled/disable "hdmi_ignore_edid"

Yes it will reread if you trigger it, but I don't believe hdmi_ignore_edid is going to help much under those situations.

Perhaps the better thing to ask is what you are trying to achieve.
by 6by9
Mon Aug 19, 2019 1:00 pm
Forum: Advanced users
Topic: Disable Usb Hub on Pi4
Replies: 9
Views: 217

Re: Disable Usb Hub on Pi4

Thanks! So I should change the status of the node to disabled, recompile the overlay amd and replace it in /boot right? It's not an overlay, it's part of the base DT that is compiled into bcm2711-rpi-4-b.dtb. You can make a custom DT, or you could create an overlay to disable the PCI-E interface (p...
by 6by9
Mon Aug 19, 2019 12:30 pm
Forum: OpenMAX
Topic: H264 Keyframe Question
Replies: 2
Views: 140

Re: H264 Keyframe Question

Setting the intraperiod is how many there are between every I frame. You can only start decoding a stream from an I-frame (technically an IDR frame, but all of our I-frames are). Using "raspivid -g -1" is a little bit of a mess over signed vs unsigned values in the code. The underlying value used by...
by 6by9
Mon Aug 19, 2019 12:25 pm
Forum: Graphics programming
Topic: Relationship between mode set with `tvservice` and DRM
Replies: 1
Views: 131

Re: Relationship between mode set with `tvservice` and DRM

DRM is sitting on top of the firmware modesetting. tvservice is an alternate way into the same subsystem. Using tvservice will cause grief with DRM as DRM has no idea that things have changed (it believes it is master and no one else can change things). It's the same as DispmanX including being an a...
by 6by9
Mon Aug 19, 2019 11:01 am
Forum: General discussion
Topic: Independent Sound HDMI0 and HDMI1
Replies: 7
Views: 214

Re: Independent Sound HDMI0 and HDMI1

Merged https://github.com/raspberrypi/linux/pull/3100 Should be available via rpi-update. Thank you very much! I will give it a go. This will make multi-seat audio work without an external USB device for sound on the second seat. Now, we just need a full KMS driver that has two devices :) 3D accele...
by 6by9
Mon Aug 19, 2019 10:49 am
Forum: Graphics, sound and multimedia
Topic: HDMI to CSI-2 via TC358743 on kernel 4.1
Replies: 603
Views: 185104

Re: HDMI to CSI-2 via TC358743 on kernel 4.1

Thank you for your answer. Actually I didn't provide any custom EDID in configuration, so board is sending something default to camera. But here is tricky part, I am pretty sure these blackmagic's hdmi output is fixed, as it can be used for external recorder, they don't provide anything else than 1...
by 6by9
Mon Aug 19, 2019 10:30 am
Forum: General discussion
Topic: Independent Sound HDMI0 and HDMI1
Replies: 7
Views: 214

Re: Independent Sound HDMI0 and HDMI1

Now, we just need a full KMS driver that has two devices :) 3D acceleration doesn't work on multi-seat, yet. AFAIK Full KMS won't expose two framebuffers either, as that is part of the DRM core framework which is used by both drivers. The KMS device exposes the CRTCs and encoders, and then the drm_...
by 6by9
Mon Aug 19, 2019 9:45 am
Forum: Graphics programming
Topic: Programmatically enabled/disable "hdmi_ignore_edid"
Replies: 3
Views: 154

Re: Programmatically enabled/disable "hdmi_ignore_edid"

No. The EDID is parsed at boot time, therefore any programmatical route would have to rewrite config.txt anyway. The GPU has no access to the SD card once Linux has booted, so it can't do it.
by 6by9
Mon Aug 19, 2019 9:42 am
Forum: Graphics programming
Topic: MMAL video playback into DRM planes.
Replies: 3
Views: 272

Re: MMAL video playback into DRM planes.

It's holiday season in the UK, therefore expect slightly lower levels of support from employees at Pi Towers. I'm back full time as of next Monday, and I'm not sure when James is back. Correct, FKMS is not exposing transpose as it has to be done via a two pass render using the transposer hardware bl...
by 6by9
Mon Aug 19, 2019 9:19 am
Forum: Graphics, sound and multimedia
Topic: HDMI to CSI-2 via TC358743 on kernel 4.1
Replies: 603
Views: 185104

Re: HDMI to CSI-2 via TC358743 on kernel 4.1

manmathan74 wrote:
Mon Aug 19, 2019 6:56 am
Hi All,
Can someone help? I am trying to get the B101 v4 board to work on Pi 3b+ but am lost with so many point on this forum. Is there a step by step on this board?

Thanks,
https://www.raspberrypi.org/forums/view ... 8#p1339178
by 6by9
Mon Aug 19, 2019 9:17 am
Forum: Graphics, sound and multimedia
Topic: HDMI to CSI-2 via TC358743 on kernel 4.1
Replies: 603
Views: 185104

Re: HDMI to CSI-2 via TC358743 on kernel 4.1

Hello, I have an issue which might be a bug - tested on both Auvidea B101/3b+ and B102/Zero with two blackmagic camers - Pocket 4K and Micro Cinema Camera. I assume hardware works good, as other video sources are captured properly. My issue - video captured has broken colors - like way too much gre...
by 6by9
Mon Aug 19, 2019 7:36 am
Forum: Advanced users
Topic: Disable Usb Hub on Pi4
Replies: 9
Views: 217

Re: Disable Usb Hub on Pi4

Disable the pci-e interface via device tree to totally disable the USB controller.
https://github.com/raspberrypi/linux/bl ... .dtsi#L321
by 6by9
Mon Aug 19, 2019 7:28 am
Forum: General discussion
Topic: Independent Sound HDMI0 and HDMI1
Replies: 7
Views: 214

Re: Independent Sound HDMI0 and HDMI1

Merged https://github.com/raspberrypi/linux/pull/3100
Should be available via rpi-update.
by 6by9
Wed Aug 14, 2019 1:50 pm
Forum: Camera board
Topic: v2.1 camera module, FSTROBE signal and pinnings
Replies: 3
Views: 400

Re: v2.1 camera module, FSTROBE signal and pinnings

The imx219 strobe and gpo lines are not broken out from the sensor down the small flexi to the camera board, let alone down the 15pin flexi.

The two gpios from the pi to the camera used to be for the power enable and led signals on the camera board, but the led line is not used for the v2 sensor.
by 6by9
Tue Aug 13, 2019 12:56 pm
Forum: General discussion
Topic: RPI4 not booting, with latest Raspbian version.
Replies: 6
Views: 503

Re: RPI4 not booting, with latest Raspbian version.

EDID isn't working properly yet, so you will have to wait until it is, or change config.txt by hand for your monitor. ??! There are a small number of edids that are giving issues, but the pi4 s now using the standard Linux kernel edid parsing so you're likely to have issues with those displays on a...
by 6by9
Tue Aug 13, 2019 12:43 pm
Forum: Raspbian
Topic: VC4 and Mesa Drivers Update Plan
Replies: 44
Views: 10907

Re: VC4 and Mesa Drivers Update Plan

Thanks jamesh. Below is why I said not high priority. Your answer helps explain going forward and that's great. I'm just trying to migrate my app and will have to be patient for updates. Thanks for your contributions! "It is something we are aware of but it's not top of the list of issues. Basicall...
by 6by9
Tue Aug 13, 2019 7:59 am
Forum: Camera board
Topic: Pi NOIR Camera Tinted Images
Replies: 5
Views: 291

Re: Pi NOIR Camera Tinted Images

https://www.raspberrypi.org/forums/view ... 3&t=245994
(it's even a sticky at the top of this forum!)
by 6by9
Mon Aug 12, 2019 9:06 am
Forum: Advanced users
Topic: Switching 1920X1080(horizontal) to 1080x1920(vertical)
Replies: 4
Views: 181

Re: Switching 1920X1080(horizontal) to 1080x1920(vertical)

Pi3 changing resolution, then you're almost certainly loading vc4-kms-v3d or vc4-fkms-v3d. In either case you need to be using xrandr to rotate the screen within x. As aBUGSworstnightmare says, the screen configuration tool shipped with buster let's you do that easily.
by 6by9
Sat Aug 10, 2019 7:42 pm
Forum: Graphics, sound and multimedia
Topic: Possible to separate audio and cec onto different hdmi ports?
Replies: 2
Views: 189

Re: Possible to separate audio and cec onto different hdmi ports?

hdmi_preferred in config.txt should set up the port for both audio and cec together. James was looking at changes to separate the two, but I can't recall where that got to as it was overtaken by https://github.com/raspberrypi/linux/pull/3100 which exposes audio on the two HDMI interfaces as independ...
by 6by9
Sat Aug 10, 2019 7:29 pm
Forum: Camera board
Topic: Using ov9281, do I need an extra driver?
Replies: 5
Views: 162

Re: Using ov9281, do I need an extra driver?

There are a couple of potential options for drivers, although none of them totally trivial. Hermann's already linked to the Arducam product using the same device. IIRC they've made parts of it closed source, which is a touch annoying. https://www.vision-components.com/fileadmin/external/documentatio...
by 6by9
Thu Aug 08, 2019 6:26 pm
Forum: General discussion
Topic: Raspberry Pi 4 Dual Monitors
Replies: 41
Views: 4205

Re: Raspberry Pi 4 Dual Monitors

I have two 1280x1024 screens connected to my Raspberry Pi 4 B with 4 GB RAM. The monitors are connected via HDMI to DVI-D connectors. What is the best amount of GPU memory to use with this? Now I have 128 MB, but that is perhaps unnecessarily high. The new driver allocates memory from the kernel cm...
by 6by9
Thu Aug 08, 2019 3:43 pm
Forum: Graphics programming
Topic: Pi4: MMAL video in GL (on DRM). Flickering texture. Any idea what might be wrong?
Replies: 6
Views: 266

Re: Pi4: MMAL video in GL (on DRM). Flickering texture. Any idea what might be wrong?

Can you add frame numbers to the top and bottom half of the images and check to see if the top and bottom halves are from the same image? I can't quite tell from your image, but it looks like the bottom half is from an earlier frame, in which case I have a guess. Unfortunately that doesn't seem to ...
by 6by9
Thu Aug 08, 2019 2:17 pm
Forum: Compute Module
Topic: Completely disable the ACT LED at very early boot stages
Replies: 4
Views: 229

Re: Completely disable the ACT LED at very early boot stages

The firmware uses the LEDS_DISK_ACTIVITY define from dt-blob.dts/bin to determine which GPIO to wiggle for the activity LED. With that listed as "absent" (the default) then your GPIO will adopt whatever state is defined under pins@N. The Linux kernel does have a define in the kernel device tree for ...
by 6by9
Thu Aug 08, 2019 2:07 pm
Forum: Graphics programming
Topic: Pi4: MMAL video in GL (on DRM). Flickering texture. Any idea what might be wrong?
Replies: 6
Views: 266

Re: Pi4: MMAL video in GL (on DRM). Flickering texture. Any idea what might be wrong?

Probably unrelated as I read your issue as being on textures, but I am tracing through an issue with LibreElec at the moment where tearing happens. It looks like we're returning the DRM flip complete event early under some situations. Resolving that is more complex than it at first seems. Can you ad...

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