overview for Ti

[–] [email protected] 3 points 3 months ago (1 children)

Ig thats where most of my confusion comes from, to me saying sth is a "spectrum" always evokes sth along the lines of gay <--------------------> straight (ie one dimensional) with things mapping into this interval. But ig if you also include more than one axis in your meaning of "spectrum" there wouldn't be as straight forward of an ordering for any given "spectrum". + Like @[email protected] said technically even the 1 dimensional spectrum can have more than one order and the "obvious" one is just obvious because we are used to it from another context not because its specifically relevant to this situation.

Spectrum rule in c/[email protected]

[–] [email protected] 31 points 3 months ago (17 children)

How is a spectrum supposed to not have a total ordering? To me saying sth is a spectrum always invokes an image of being able to map to/represent the property as an interval (unbounded or bounded) which should always give it a total ordering right?

(Newbie question) Did i handle my system crashing correctly? in c/[email protected]

[–] [email protected] 2 points 4 months ago (1 children)

Thanks for the detailed explanation on the sysreq keys & when & how to use them for unlocking a frozen system :D. Also for the systemctl bit because i wasnt even sure what to do if i had gotten to a console lol.

(Newbie question) Did i handle my system crashing correctly? in c/[email protected]

[–] [email protected] 3 points 4 months ago

It’s fixed in 6.8.10 and 6.9 if you have the ability to upgrade to those.

Honestly idk how id even begin to do that lol, and id also maybe rather not start my first week of linux use by immediately trying to change the kernel version on my own XD (either down or up). I did hear about an issue with rdr2 and kernel 6.8.9 from a reddit post which i found through someone writing about problems with the game on its protondb page. But i thought i was fine as my game worked normally until i encountered the crash & because the reddit and protondb post say its solved by enabling rebar which (iirc) i already have.

However idk if that reddit posts issue is the same/related to the one you linked. Since the rest of the game and my system seem to be mostly fine i think ill either just not play the game or specifically avoid the cutscene when i do (its in an optional quest luckily). And then ill maybe return to it after the updated kernel arrives on fedora to see if it solves the crash or not.

(Newbie question) Did i handle my system crashing correctly? in c/[email protected]

[–] [email protected] 2 points 4 months ago* (last edited 4 months ago)

Thanks for the link! I managed to set up sysrq with it, which might have saved me from reinstalling steam when the crash occurred the second time (see the update in my post).

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(Newbie question) Did i handle my system crashing correctly? (lemmy.blahaj.zone)

submitted 4 months ago* (last edited 5 days ago) by [email protected] to c/[email protected]

22 comments fedilink

Ive just installed Linux (Fedora 40 KDE) on my main PC over the weekend, so im a complete newbie and i apologize if some of my questions are nonsensical 😅. Yesterday evening the system seemed to completely lock up at a certain point while playing Red Dead Redemption 2 for the first time (installed & run via steam using proton experimental). Id love to know if i handled this situation correctly and how to avoid this or handle it more gracefully in the future. Ill begin by recounting what happened and then ask my questions:

The game froze during a cutscene and continued to play audio for a bit after it froze visually but then that stopped too. I have two monitors, the second completely black screened and the first one was frozen on the last frame of the game. As far as i could tell nothing in KDE was still responding to normal key presses or the mouse.

After a some searching online i decided to try through the ctrl + alt + (f2, f3, ... , f6) key combinations to get into a console, that didnt work. As a last resort i tried alt + sysreq (print screen) + REISUB to safely reboot it. That ALSO didnt work, it was p. damn late in the day so i just decided to risk it and use the power button on my pc.

I was prepared for it not to boot anymore due to data corruption or sth, but it seemed mostly fine? My KDE panels were slightly messed up (but that took like 10 sec to fix) and besides that the only odd thing i've found so far is that steam refused to start properly and i had to reinstall it.

So did i handle this situation correctly? Specifically:

did alt + printscreen + REISUB save my system or do nothing? As i said it didn't reboot when i did it so i thought it was useless. But after i forcibly restarted my pc and looked it up some more it seems all but alt + printscreen + S may have been disabled, so was alt + printscreen + S responsible for my system still starting without too many problems after i forcibly shut it down?
why did this happen & how to prevent it? My system should b powerful enough to run RDR2 (Radeon RX 6800, Ryzen 5 5600X, 32GB ram) and i had nearly no problems up until the crash. So whats at fault? On protondb RDR2 has p. good ratings, did i just get unlucky and found one of the few edge cases where it breaks? But even then, why would a proton/game crash take seemingly the whole OS with it?
is it a bad or a good idea to try and trigger this again on purpose? Id really like to know if this was a freak accident or a consistent problem (and if its consistent if eg. switching to proton 9.0.1 alleviates it). So was i lucky that nothing on my PC got badly damaged from this incident and i shouldn't try to trigger it again for fear of permanent damage? Or can i expect that having to reinstall Steam everytime it crashes is the worst that could happen while testing this?

UPDATE: I went back and did the same part of the game again but this time running it with proton 9.0.1 and the crash still occurred and in the exact same spot in the cut scene too. For reference, it crashed both times during this cutscene: https://www.youtube.com/watch?v=7UHv0SiVhWY @ around 1:23 when the explosion goes off (i only get to hear it briefly the visuals freeze seemingly just before it explodes).

Trying ctrl + alt + f keys didn't seem to do anything again. I had at least enabled the sysreq keys and REISUB appeared to work and got me back into the system this time without having to adjust KDE panels or reinstalling Steam. Visually the crash was a little different this time, i hit win/meta soon after it happened which after a second or two exchanged the stuck game visuals for a half cutoff browser window on my main monitor (and black otherwise) and my secondary monitor was filled with black and white noise with a bit of color in between.

UPDATE 2 (17/06/2024): I tried it again for the first time since the original post, im now on Kernel 6.9.4 and the crash occured in the exact same spot and looking more or less as described in the previous instances. I managed to get back into a normal state due to alt + sysreq + i (alt + sysreq + k didnt seem to have had any effect).

UPDATE 3 (16/09/2024): I've tried it again, proton 9.0-2 and kernel 6.10.9 and its still crashing at the exact same pont as usual. Only difference is that this time alt + sysreq + REIB didnt seem to have any effect. Tho i might have forgotten "I" now that i think about it again. I had to do a hard restart using the power button, but it doesnt seem like anything broke.

UPDATE 3.5 (16/09/2024): Tried the next newest proton version steam has (experimental). Now the dialogue during the gameplay bit just before the cutscene doesnt trigger, then the game goes into "cutscene mode" (i think, i get black bars top and bottom and the menu becomes unavailable) but no cutscene plays and i (presumably) get softlocked. I tried waiting in case it was playing but i didnt see, i waited 5 min or so and it never ended.

Calculus made easy in c/[email protected]

[–] [email protected] 7 points 4 months ago

I feel like this isn't quite fair to math, most of these can apply to school math (when taught in a very bad way) but not even always there imo.

Its true that math notation generally doesn't give things very descriptive names, but most of the time, depending on where you are learning and what you are learning, symbols for variables/functions do hint at what the object is supposed to be E.g.: When working in linear algebra capital letters (especially A, B, C, D as well as M) are generally Matrices, v, w, u are usually vectors and V, W are vector spaces. Along with conventions that are largely independent of the specific math you are doing, like n, m, k usually being integers, i or j being indices, f and g being functions and x, y, z being unknowns.

Also math statements should be given comments too. But usually this function is served by the text around the equations or the commentary given along side them, so its not a direct part of the symbolic writing itself (unlike comments being a direct part of source code). And when a long symbolic expression isn't broken up or given much commentary that is usually an implicit sign that it should be easy/quick for the reader to understand/derive based on previously learned material.

Finally there's also the Problem with having to manipulate the symbols. In Code you just write it and then the computer has to deal with it (and it doesn't care how verbose you made a variable name). But in math you are generally expected to work with your symbolic expressions and manipulate them. And its very cumbersome to keep having to rewrite multi-letter names every time you manipulate an expression. Additionally math is still generally worked on in paper first, and then transferred into a digital/printed format second, so you can't just copy + paste or rely on auto completion to move long variable names around, like you might when coding.