可以试试这个，改注册表手动开：

reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\VideoSettings" /v EnableHDRForPlayback /t REG_DWORD /d 1

Source: https://support.microsoft.com/en-us/topic/-stream-hdr-video-can-t-be-enabled-when-switched-off-before-upgrading-to-windows-10-version-1903-or-later-ffc644ba-0d65-36f8-4e58-84bb94d4ac14

hmm. 感觉是 bug. 我这没问题

这个开关似乎只会影响 UWP app 的 HDR playback，Chrome 我试了关掉这个也能正常 HDR: https://support.microsoft.com/en-us/windows/video-playback-settings-in-windows-10-39ad5cbf-b2d1-2664-bd55-65028db05579

https://i.imgur.com/EGIbUuU.png

@v2clay #10 看起来是的：

https://crbug.com/1012564

> Where QUIC and TLS (over TCP) differ is when the cert is valid as determined by the CertVerifier, QUIC imposes an additional check that the cert is issued by a known root (as opposed to a user-installed root) and internally returns QUIC_CERT_ROOT_NOT_KNOWN if it is not issued by a known root.

> The use of --origin-to-force-quic-on is intended for someone developing a QUIC server. When testing that a QUIC server is working as expected, I think that flag is a reasonable way to test that.


https://www.chromium.org/quic/quic-faq

> If you're testing only with the toy quic server, you can do something like:

> % chrome --disable-setuid-sandbox --enable-quic --origin-to-force-quic-on=localhost:6121 http://localhost:6121/

@v2clay #6

这是我之前架的时候用的，Alt-Svc 只加了 h3-29 和对应的 max-age，没加 QUIC-Status header. 刚试了一下，还是可以正常走 QUIC

```
server {
listen 443 ssl;
listen 443 http3 reuseport;
listen [::]:443 ssl;
listen [::]:443 http3 reuseport;
server_name abc.xyz;

ssl_protocols TLSv1.3;
ssl_certificate /etc/letsencrypt/live/abc.xyz/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/abc.xyz/privkey.pem;

error_page 497 =307 https://$host$request_uri;

add_header Alt-Svc 'h3-29=":443"; ma=86400';

location / {
proxy_pass http://localhost:8080;
proxy_set_header X-Forwarded-For $remote_addr;
}
}
```

Chrome dev tools:

https://i.imgur.com/nwwZPtH.png

可能需要刷新一次才会显示 QUIC.

@imydou #5

macOS Monterey beta 3 (21A5284e)

http://swcdn.apple.com/content/downloads/02/08/071-63739-A_G5RYVW5JHT/dfz5gp3s0jm9vl7m30oewq141zkpv8edr8/InstallAssistant.pkg

```
pkgutil --expand InstallAssistant.pkg SharedSupport
```

把解压出来的 SharedSupport 丢进 /Install macOS Monterey beta.app/Contents/Resources/ 下应该就能装了

这 blog 里的 Alt-Svc header 写法有点老了，h3 改成 h3-29 应该就好了；几个月前架过玩，会显 quic

参见我发在 https://www.v2ex.com/t/790283#r_10715070 下的方案供参考，能用微软雅黑。

理论上可以交一个 PR 让 TG Desktop qtbase 在英文（非中韩日）系统语言下也用简中字体列，但过 review 的希望可能不大（目前默认是日文字体列）:

https://github.com/desktop-app/patches/blob/master/qtbase_5_15_2/0005-fix-cjk-font-fallback.patch#L7

variable referenced from:

https://github.com/qt/qtbase/blob/5.15.2/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase.cpp#L1856

我直接 patch 掉了 Qtbase 的 `GetUserDefaultLangID` syscall，保证优先使用中文字体集（雅黑 UI ），即使 user default langid 是非简体中文。虽然不是 FontMod 任意替换字体，但也比优先用日本字体歪歪扭扭的强得多。

用 WSL 或 msys2 (mingw) patch，适用 2.8.9 / 2.8.10 x64:

```
printf '\x66\xB8\x04\x10\x90\x90' | dd of=Telegram.exe bs=1 seek=$((0x02F7DB97)) count=6 conv=notrunc
```

#2 说的应该是 `M_MMAP_THRESHOLD`: https://elixir.bootlin.com/glibc/glibc-2.33/source/malloc/malloc.c#L707

另 https://stackoverflow.com/q/30542428:

`mallopt()` could set parameters to control behavior of `malloc()`, and there is a parameter named `M_MMAP_THRESHOLD`, in general:

- If requested memory is less than it, `brk()` will be used;
- If requested memory is larger than or equals to it, `mmap()` will be used;

The default value of the parameter is `128kb`

@skpoo #7

https://plugable.com/products/usbc-dp/

spec 上只写了 4K @ 60 via DP 1.2 但实测可用

应该是 adapter 的兼容性问题。

我拿了条杂牌 USB-C to DisplayPort 线，可以 4K @ 144Hz + HDR，应该是成功走了 DP 1.4 + DSC 1.2：

https://i.imgur.com/kNQhJEm.png

可能是 JAMF 通过 MDM Profile 推送强制安装的。

学校 /公司发的 Mac 一般会预装他们的 MDM 用来集体管理，System Preferences - Profiles 里可以看到。

@arischow 是给某些原生不支持 HDR 的游戏开启 HDR 。原生带 HDR 的游戏 HDR off + Auto HDR 效果没有原生 HDR on 效果好。去年先在 Xbox Series X/S 上启用的，现在 PC preview，是 21H2 的新功能。

https://devblogs.microsoft.com/directx/auto-hdr-preview-for-pc-available-today/

Dota 2 我试了下没啥大问题，还能用 Auto HDR

除了不兼容 USB 和用的 TB3 之外其他符合：
https://www.amazon.com/Sabrent-Rocket-External-Aluminum-SB-DXMQ-8X2/dp/B097LVLWWN

@mycs999 U 盘引导装 11.2.3 没问题的。不过现在 App Store 下到 Big Sur Installer 应该是 11.4 的了。

第二种方法是下好 11.2.3 M1 IPSW，M1 进 DFU，连第二台 Mac 开 Apple Configurator 2，把下好的旧 IPSW 拖进去就能 Restore 。参考：
https://support.apple.com/guide/apple-configurator-2/revive-or-restore-a-mac-with-apple-silicon-apdd5f3c75ad

ipsw: https://ipsw.me/MacBookAir10,1