Posts
980
Following
72
Followers
106
Riding horses, hacking computers, phones and smartwatch.
pavel

Pavel Machek

Got 6.8-rc0 to boot on pinephone. Good. Got to disable v4l and usb power delivery to get there. Not so good.
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pavel

Pavel Machek

Got 6.7 to work on pinephone. Now libcamera does 15fps instead of 8. Good.
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pavel

Pavel Machek

Got self-compiled 6.1 kernel to boot on pinephone. I may turn this into small notebook after all... Now, if there was a simple way to rotate text-mode console, that would be nice. (Text mode is all I have for now).
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pavel

Pavel Machek

How do I tell mobian "don't try to autosuspend for next 8 hours" or better "don't try to autosuspend until kernel build is finished"? Unix was not expecting sleepy computers...
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pavel

Pavel Machek

Looking for operating system; preferably simple&opensource one. DOS-class, that is has filesystem and runs programs from filesystem, but single-tasking, without user/kernel protection. For machines with > 16MB RAM we have linux. I'm looking for something for machines between 128KB and 16MB. Extra point if it is not too ugly and is Unix-style, 8.3 naming convention is close to disqualifying DOS...
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pavel

Pavel Machek

lds and Makefile, and I have code running bare-metal (ok, s-mode) on risc-v. Wow. Easier than expected. https://gitlab.com/tui/tui/-/tree/master/vroot?ref_type=heads
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pavel

Pavel Machek

@martijnbraam I'm debugging low framerates with main camera on PinePhone. I can't convince libcamera to get more than 8.5 fps. So I tried megapixels, I could not clone from main site, so I have:

519570a267ad8e70c16f45c7157ac195f57c4c66 (HEAD -> master, origin/master, origin/HEAD)
Remove calibration data for PP front camera (MR 34)

Preview looks nicely smooth, but AFAICT it is around 7fps. I'm on mobian. Any idea of possible causes / how to debug that?
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pavel

Pavel Machek

"If it's max, not a pax". It looks like 737MAX saga is continuing, this time it is not computers. It looks like door flew of a plane at 14000 feet, vas-av has a good video on youtube.
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pavel

Pavel Machek

@jiska First, thanks for nice talk at 37c3. I don't have an iPhone, but catching IMSI catchers is cool. OTOH it is also too late -- by the time you analyze your logs, IMSI catcher already has your position logged.

Early gsm phones (like Nokia 5110) had service menus with capabilities such as 'lock to specific cell tower' which could be used to prevent that -- just lock your phone to "known good" cells. Have you seen similar functionality in modern modems?
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pavel

Pavel Machek

Trying to do debayering on CPU using vector extension. So far targeting x86-64 and pinephone... and so far it is few times slower than naive approach. Is there good high-level overview of avx and neon somewhere? Any hints? Anyone willing to help?
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pavel

Pavel Machek

"Recently" terminals started beeping when mouse enters/exits the window. It seems like running emacs remotely then terminating the connection does that. How is this ... annoying glitch called and how do I get rid of it? Debian 11.8 with mate.
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pavel
repeated
c3voc_releases@chaos.social

c3voc releases

Breaking "DRM" in Polish trains has been released on media.ccc.de https://media.ccc.de/v/37c3-12142-breaking_drm_in_polish_trains

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pavel

Pavel Machek

Trying to do RGBA->RGB conversion with AVX. Yes, it is trivial task. No, I don't get speedup over trivial code.
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pavel

Pavel Machek

Camera ISP: Does denoise come before or after debayer? I see "illogical" order in the paper, and I believe that logical order should also be easier to implement...
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pavel

Pavel Machek

@martijnbraam I see you are doing a lot of work on dng processing. I'm trying to do raw processing on GPU to enable video recording. Do you have any good pointers on dng processing? Did you do or do you plan to play with video recording?
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pavel

Pavel Machek

I'd like to do command-line application that uses GPU to do some some computation with graphics. (Debayer, maybe more). Need it to work on old systems (Debian 11, PinePhone). What libraries/frameworks should I look at?
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pavel

Pavel Machek

libcamera is normally built with -O0. Now I understand first version of debayer algorithm...
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pavel

Pavel Machek

"Creative society" aka "AllatRa" tried to spam me with their nonsense about some kind of infinite energy source again today. They are millenial sect, quite popular in Czech republic :-(. https://cs.wikipedia.org/wiki/AllatRa With hundreds of members, intensive trolling, I believe they should have article on english wikipedia, too, but so far I was not able to accomplish that. If someone can help...
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pavel

Pavel Machek

Bad thing about Li-ion batteries is that each phone seems to have its own size. I have interesting/mystery Firefox OS phone, that came without battery and refuses to turn on. But there's a good thing, too. There are so many Li-ion powered devices that you may have "compatbile" battery, already. I did. Battery from Winner WG8 seems to fit inside mystery phone case. Ok, it needs a lot of padding... but I may be able to try the phone out. Not sure if trying to charge it in it is good idea, but...
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pavel

Pavel Machek

RGB888 in libcamera is same as BGR24 in SDL. Of course, RGB24 _and_ RGB888 exist in SDL, too... they are just different.
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