https://blog.cui.to/en/post/tag/troubleshooting/ Samuel N Cui’s personal blog: technology, projects and life. en-US https://blog.cui.to/en/post/set-4k-10bit-120hz-via-hdmi-with-ryzen-5700g-a520/ https://blog.cui.to/en/post/set-4k-10bit-120hz-via-hdmi-with-ryzen-5700g-a520/ Mon, 03 Apr 2023 18:21:13 +0800 Describes achieving 4K, 4:4:4, 10-bit, 120 Hz output from a Ryzen 5700G/A520 HTPC with an active DisplayPort-to-HDMI 2.1 adapter, while leaving questions about bandwidth and possible DSC use unresolved. https://blog.cui.to/en/post/ip-rule-fwmark-not-working/ https://blog.cui.to/en/post/ip-rule-fwmark-not-working/ Mon, 30 May 2022 14:48:22 +0800 Documents a policy-routing setup that failed to respond to iptables marks, including the fwmark_reflect and rp_filter changes that made it work and the accompanying configuration example. https://blog.cui.to/en/post/%E6%97%A0%E6%B3%95%E9%80%9A%E8%BF%87-thinkpad-t470p-%E7%9A%84-m-2-%E6%89%98%E7%9B%98%E4%BD%BF%E7%94%A8-sata-express-%E6%8E%A5%E5%8F%A3/ https://blog.cui.to/en/post/%E6%97%A0%E6%B3%95%E9%80%9A%E8%BF%87-thinkpad-t470p-%E7%9A%84-m-2-%E6%89%98%E7%9B%98%E4%BD%BF%E7%94%A8-sata-express-%E6%8E%A5%E5%8F%A3/ Mon, 14 Jan 2019 18:51:41 +0800 Documents an unsuccessful attempt to use a ThinkPad T470p M.2 tray with a desktop SATA Express port, explaining the differing clock-signal arrangements and why the tray did not provide the hoped-for NVMe upgrade. https://blog.cui.to/en/post/zfs-zed-cpu-keep-full/ https://blog.cui.to/en/post/zfs-zed-cpu-keep-full/ Wed, 14 Mar 2018 15:21:36 +0800 Investigates sustained 100% CPU usage by zed after a kernel and ZFS upgrade, tracing the problem to mismatched userspace and kernel-module versions and resolving it by rebuilding the module. https://blog.cui.to/en/post/nginx-port_in_redirect-%E9%80%89%E9%A1%B9%E7%9A%84%E7%94%A8%E5%A4%84/ https://blog.cui.to/en/post/nginx-port_in_redirect-%E9%80%89%E9%A1%B9%E7%9A%84%E7%94%A8%E5%A4%84/ Thu, 30 Nov 2017 11:55:59 +0800 A brief nginx configuration note on removing unwanted port numbers from trailing-slash redirects when a request passes through two proxy layers. https://blog.cui.to/en/post/windows-nt-fonts-fallback-about-wtp-and-itunes/ https://blog.cui.to/en/post/windows-nt-fonts-fallback-about-wtp-and-itunes/ Wed, 21 Jan 2015 01:00:23 +0800 Traces distorted Chinese text in iTunes on Windows Thin PC to incomplete font fallback settings, then describes restoring those settings from a working Windows 7 computer. https://blog.cui.to/en/post/%E5%A6%82%E4%BD%95%E5%8F%96%E6%B6%88%E6%9F%90%E4%B8%AA%E7%89%B9%E5%AE%9A%E7%9A%84%E8%BD%AF%E4%BB%B6%E7%9A%84%E7%94%A8%E6%88%B7%E8%B4%A6%E6%88%B7%E6%8E%A7%E5%88%B6-%E8%BD%AC/ https://blog.cui.to/en/post/%E5%A6%82%E4%BD%95%E5%8F%96%E6%B6%88%E6%9F%90%E4%B8%AA%E7%89%B9%E5%AE%9A%E7%9A%84%E8%BD%AF%E4%BB%B6%E7%9A%84%E7%94%A8%E6%88%B7%E8%B4%A6%E6%88%B7%E6%8E%A7%E5%88%B6-%E8%BD%AC/ Tue, 29 Oct 2013 09:19:41 +0800 A reposted Windows 7 registry tip using RunAsInvoker for programs that do not modify system files or settings, while leaving system-wide User Account Control enabled. https://blog.cui.to/en/post/ubuntu-postfix-let-cpu-high/ https://blog.cui.to/en/post/ubuntu-postfix-let-cpu-high/ Wed, 24 Jul 2013 21:11:26 +0800 An investigation into high server load uncovers over ten thousand spam messages in the Postfix queue and missing SMTP authentication—a lesson in checking mail-server security settings. https://blog.cui.to/en/post/%E5%A6%82%E4%BD%95%E4%BD%BFz-push%E6%94%AF%E6%8C%81%E4%B8%AD%E6%96%87vcarddir/ https://blog.cui.to/en/post/%E5%A6%82%E4%BD%95%E4%BD%BFz-push%E6%94%AF%E6%8C%81%E4%B8%AD%E6%96%87vcarddir/ Mon, 22 Jul 2013 02:39:00 +0800 Troubleshooting garbled Chinese in Z-push’s VCardDir by bypassing an unnecessary character conversion. The separate problem of naming VCard files for entries added on a phone remains unresolved.